Co-reporter:Yi Cheng, Jun Lin, Tijun Wu, Hao Wang, Songhai Xie, Yan Pei, Shirun Yan, Minghua Qiao, Baoning Zong
Applied Catalysis B: Environmental 2017 Volume 204(Volume 204) pp:
Publication Date(Web):5 May 2017
DOI:10.1016/j.apcatb.2016.11.058
•The Mg-decorated Fe/rGO catalysts were designed for syngas to light olefins (FTO).•Mg mitigated CO2 emission by inhibiting magnetite formation.•Further decoration by K drastically boosted the FTO activity.•K promoted the carburization of iron and hence the activity.•The synergy of Mg and K on CO dissociation may further contribute to the activity.One-step conversion of syngas (a mixture of CO and H2) to C2–C4 light olefins (FTO) has attracted enormous attention in recent years because of the great improvement in process simplicity. However, on the documented FTO catalysts, the carbon efficiency is quite low (CO2 selectivity as high as ∼50%) and hence the green-house gas emission is high. Herein, we report about the design of novel Mg and K dual-decorated iron catalysts supported on reduced graphene oxide (rGO) to address this issue. We identified that on a dual-decorated FeMgK2/rGO catalyst with the optimized amounts of Mg and K, not only the selectivity to light olefins amounted to 65.0%, but also the selectivity to CO2 was appreciably cut down to 40.8%. On the basis of systematic characterizations, we propose that the suppression of the formation of magnetite during FTO because of Mg decoration effectively inhibited the water–gas shift (WGS) reaction, one of the main reaction pathways for CO2 generation. Furthermore, successive decoration with only 0.50–2.0 wt% of K drastically boosted the iron time yield to hydrocarbons (FTY) to 1060–1706 μmol gFe−1 s−1 and the iron time yield to light olefins (FTYole) to 521–1003 μmol gFe−1 s−1. The new strategy of alkaline-earth metal-alkali metal dual decoration for the design of the iron-based catalysts may propel the development of a practical FTO process featuring high productivity and low CO2 emission.Download high-res image (106KB)Download full-size image
Co-reporter:Yiqiu Fan, Shijie Cheng, Hao Wang, Jing Tian, Songhai Xie, Yan Pei, Minghua Qiao, Baoning Zong
Applied Catalysis B: Environmental 2017 Volume 217(Volume 217) pp:
Publication Date(Web):15 November 2017
DOI:10.1016/j.apcatb.2017.06.011
•Crystal phase effects of ZrO2 on the Pt–WOx/ZrO2 catalysts were studied.•Tetrahedral ZrO2 (t-ZrO2) was superior to monoclinic ZrO2 (m-ZrO2) in dispersing Pt.•Using t-ZrO2 as the support also led to more Brønsted acid sites.•Pt–WOx/t-ZrO2 converted glycerol to 1,3-propanediol (1,3-PDO) in higher efficiency.•The underlying reason for the enhanced catalytic performance was elucidated.The effects of the crystal phases of ZrO2 in the Pt–WOx/ZrO2 catalysts on glycerol hydrogenolysis to 1,3-propanediol (1,3-PDO) were comparatively studied. Pt and WOx were sequentially deposited on monoclinic (m-ZrO2) and tetragonal (t-ZrO2) ZrO2 supports with similar surface areas by the wetness impregnation method. On both catalysts, sub-nanosized Pt particles were well dispersed on the supports, and the WOx species were mainly in the monomeric state and partly covered the Pt particles. The Pt–WOx/m-ZrO2 catalyst had larger Pt particle size and less Brønsted acid sites than the Pt–WOx/t-ZrO2 catalyst. In glycerol hydrogenolysis, the glycerol conversion and 1,3-PDO selectivity on the Pt–WOx/m-ZrO2 catalyst were less than one half of those on the Pt–WOx/t-ZrO2 catalyst. The Pt–WOx/t-ZrO2 catalyst exhibited a high 1,3-PDO yield of 49.4%, an excellent 1,3-PDO productivity of 5.10 g gPt−1 h−1, and good recyclability. The superiority of the Pt–WOx/t-ZrO2 catalyst in glycerol hydrogenolysis to 1,3-PDO is attributed to the better synergy between smaller Pt particles in affording hydrogen atoms and more Brønsted acid sites in converting glycerol to the intermediate suitable for the formation of 1,3-PDO.Download high-res image (107KB)Download full-size image
Co-reporter:Yiqiu Fan;Shijie Cheng;Hao Wang;Danhong Ye;Songhai Xie;Yan Pei;Huarong Hu;Weiming Hua;Zhen Hua Li;Minghua Qiao;Baoning Zong
Green Chemistry (1999-Present) 2017 vol. 19(Issue 9) pp:2174-2183
Publication Date(Web):2017/05/08
DOI:10.1039/C7GC00317J
It has been documented that W-modified Pt catalysts with relatively high tungsten contents are effective for the catalytic transformation of biodiesel-derived glycerol to 1,3-propanediol (1,3-PDO). Herein, we report a new finding that Pt/W–SBA-15 catalysts with extremely low W/Si atomic ratios (≤1/80) exhibit excellent catalytic performance in the hydrogenolysis of glycerol to 1,3-PDO. In particular, a Pt/W–SBA-15 catalyst with the W/Si ratio of as low as 1/640 (Pt/W–SBA-15(1/640)) gave rise to the highest 1,3-PDO selectivity of 70.8% at a high glycerol conversion of 86.8% and thus afforded the highest yield of 1,3-PDO of 61.5%. A combination of characterization techniques evidenced that tungsten was homogeneously incorporated into SBA-15 in the form of isolated tetragonal WO4 and only displayed Lewis acidity. The particle size of Pt evolved in a reverse volcanic curve with the W/Si ratio, with the smallest size being observed for Pt/W–SBA-15(1/640). Control experiments indicated strong synergy between Pt nanoparticles (NPs) and WO4 in the hydrogenolysis of glycerol. A probe reaction suggested that Brønsted acid sites were generated in situ on the Pt/W–SBA-15 catalysts in a H2 atmosphere by the reaction between WO4 and spillover H atoms from the Pt NPs. It is plausible that the hydrided WO4 functioned as a highly selective active centre in the hydrogenolysis of glycerol to 1,3-PDO, whereas the Pt NPs played the role of a reservoir of spillover H atoms. Thus, a good match between the isolated WO4 and the small Pt NPs was responsible for the superior catalytic performance of Pt/W–SBA-15(1/640).
Co-reporter:Yi Cheng, Jun Lin, Ke Xu, Hao Wang, Xuanyu Yao, Yan Pei, Shirun Yan, Minghua Qiao, and Baoning Zong
ACS Catalysis 2016 Volume 6(Issue 1) pp:389
Publication Date(Web):December 7, 2015
DOI:10.1021/acscatal.5b02024
Fischer–Tropsch synthesis to lower olefins (FTO) opens up a compact and economical way to the production of lower olefin directly from syngas (CO and H2) derived from natural gas, coal, or renewable biomass. The present work is dedicated to a systematic study on the effect of K in the reduced graphene oxide (rGO) supported iron catalysts on the catalytic performance in FTO. It is revealed that the activity, expressed as moles of CO converted to hydrocarbons per gram Fe per second (iron time yield to hydrocarbons, termed as FTY), increased first with the content of K, passed through a maximum at 646 μmolCO gFe–1 s–1 over the FeK1/rGO catalyst, and then decreased at higher K contents. Unlike the evolution of the activity, the selectivity to lower olefins increased steadily with K, giving the highest selectivity to lower olefins of 68% and an olefin/paraffin (O/P) ratio of 11 in the C2–C4 hydrocarbons over the FeK2/rGO catalyst. The volcanic evolution of the activity is attributed to the interplay among the positive effect of K on the formation of Hägg carbide, the active phase for FTO, and the negative roles of K in increasing the size of Hägg carbide at high content and blocking the active phase by K-induced carbon deposition. The monotonic increase in the selectivity to lower olefins is ascribed to the improved chain-growth ability and surface CO/H2 ratio in the presence of K, which favorably suppressed the unwanted CH4 production and secondary hydrogenation of lower olefins.Keywords: Fischer−Tropsch synthesis; iron catalysts; lower olefins; potassium promoter; reduced graphene oxide
Co-reporter:Yi Cheng, Yiqiu Fan, Yan Pei and Minghua Qiao
Catalysis Science & Technology 2015 vol. 5(Issue 8) pp:3903-3916
Publication Date(Web):29 May 2015
DOI:10.1039/C5CY00630A
Graphene, a two dimensional (2D) material bearing a single layer of an sp2 carbon atom network densely packed in a honeycomb structure, has attracted worldwide attention since its first experimental isolation in 2004. The unique properties of graphene, such as its large surface area, 2D structure, high adsorption capacity, excellent electrical and thermal conductivity, high mechanical strength, and easiness of modification, make it an ideal catalyst support. Therefore, research studies in this field are boosting and progress has been witnessed in the past few years. This review concentrates on recent advances in the synthesis and catalytic applications of graphene-supported metal/metal oxide nanohybrids and is woven around reactions including petrochemical, fine chemical, energy and environment-relevant reactions, with special emphasis on the contribution of graphene to the catalytic performance. Finally, a brief summary and an outlook on some of the scientific challenges and opportunities in this field are given.
Co-reporter:Dr. Xiaoyu Liu;Ke Xu;Yiqiu Fan;Dr. Yan Pei; Kangnian Fan;Dr. Zaiku Xie;Dr. Minghua Qiao
ChemCatChem 2014 Volume 6( Issue 12) pp:3318-3322
Publication Date(Web):
DOI:10.1002/cctc.201402592
Abstract
Development of a water–gas shift (WGS) catalyst durable in dynamic shutdown/startup operation is essential to enable residential applications of H2-powered fuel-cell systems but remains a conundrum for heterogeneous catalysis. We demonstrate herein that by isomorphic substitution of Zr in the lattice of CeO2 to increase the acid density of the catalyst, complemented by dosing a small amount of O2 to realistic reformate to improve the oxidizing potential, the formation of the notorious site-blocking carbonate species on the Au catalyst can be efficiently retarded. This allows the formation of a highly robust Au/Ce0.4Zr0.6O2 WGS catalyst suitable for the challenging shutdown/startup operation in realistic reformate.
Co-reporter:Jiye Hu, Yiqiu Fan, Yan Pei, Minghua Qiao, Kangnian Fan, Xiaoxin Zhang, and Baoning Zong
ACS Catalysis 2013 Volume 3(Issue 10) pp:2280
Publication Date(Web):August 29, 2013
DOI:10.1021/cs400526s
Disk- and rod-shaped hexagonal ZnO crystals with various length-to-diameter aspect ratios were controllably synthesized via a facile solution route by adjusting the precursor concentration. The shape and the dimension of the synthesized ZnO crystals were observed by scanning electron microscopy (SEM). The wurtzite structure and the growth habit were determined by powder X-ray diffraction (XRD) and transmission electron microscopy (TEM) coupled with selected-area electron diffraction (SAED). It is found that with the lowering of the precursor concentrations, the ZnO crystals were elongated along the c-axis, and the diameter of the {001} planes was reduced, leading to shape evolution from hexagonal disk to prismatic rod. As a result, the ZnO crystals were different from each other in the proportion of the {100} nonpolar planes and the {001} polar planes. The well-defined ZnO crystals were used as the cocatalyst with skeletal Ni40Mo10 in the combined reforming–hydrogenolysis (CRH) of glycerol in the absence of adventitious H2. A remarkable shape-dependent effect on the selectivity to the C3 hydrogenolysis products and the production rate of 1,2-propandiol (1,2-PDO) was identified. ZnO with a larger proportion of the nonpolar planes was more effective in the CRH of glycerol to the C3 products. An excellent linear relationship between the surface area of the {100} nonpolar planes and the production rate of 1,2-PDO was identified. This is attributed to the in situ enhancement of the Lewis acidity of the nonpolar planes of ZnO by chemisorbed CO2 from the reforming of glycerol, which greatly accelerates the dehydration of glycerol to acetol, the intermediate to 1,2-PDO.Keywords: glycerol; hydrogenolysis; promotion effect; shape; zinc oxide
Co-reporter:Bo Sun;Dr. Zheng Jiang;Di Fang;Ke Xu;Dr. Yan Pei;Dr. Shirun Yan;Dr. Minghua Qiao; Kangnian Fan;Dr. Baoning Zong
ChemCatChem 2013 Volume 5( Issue 3) pp:714-719
Publication Date(Web):
DOI:10.1002/cctc.201200653
Co-reporter:Bo Sun;Dr. Zheng Jiang;Di Fang;Ke Xu;Dr. Yan Pei;Dr. Shirun Yan;Dr. Minghua Qiao; Kangnian Fan;Dr. Baoning Zong
ChemCatChem 2013 Volume 5( Issue 3) pp:
Publication Date(Web):
DOI:10.1002/cctc.201390010
Co-reporter:Gongbing Zhou;Xiaohe Tan;Dr. Yan Pei; Kangnian Fan;Dr. Minghua Qiao;Dr. Bin Sun;Dr. Baoning Zong
ChemCatChem 2013 Volume 5( Issue 8) pp:2425-2435
Publication Date(Web):
DOI:10.1002/cctc.201300175
Abstract
Partial hydrogenation of benzene to cyclohexene is attractive in terms of feedstock accessibility, atomic economy, and operational simplicity. Herein, a series of Ru/ZrO2 catalysts were prepared by post-treatment of a binary Ru–Zn/ZrO2 catalyst using 5–30 wt % NaOH aqueous solutions. Alloying between Ru and Zn was evidenced for the catalyst post-treated only by water (Ru/ZrO2-0). Alkaline post-treatment removed metallic Zn, forming smaller Ru nanoparticles. Concomitantly, the hydrophilicity of the catalysts was increased and maximized on the 10 wt % NaOH-treated catalyst (Ru/ZrO2-10). In partial hydrogenation of benzene, the Ru/ZrO2-0 catalyst displayed the highest turnover frequency but the lowest initial selectivity to cyclohexene, whereas the Ru/ZrO2-10 catalyst exhibited the highest initial selectivity (86 %) and yield of cyclohexene (51 %) among the catalysts investigated. A quantitative relationship between the initial selectivity to cyclohexene and the hydrophilicity of these catalysts was identified, which rationalizes the significant impact of alkaline post-treatment on selectivity enhancement in partial hydrogenation of benzene to cyclohexene over Ru/ZrO2 catalysts.
Co-reporter:Bo Sun;Dr. Jun Lin;Ke Xu;Dr. Yan Pei;Dr. Shirun Yan;Dr. Minghua Qiao;Dr. Xiaoxin Zhang;Dr. Baoning Zong
ChemCatChem 2013 Volume 5( Issue 12) pp:3857-3865
Publication Date(Web):
DOI:10.1002/cctc.201300430
Abstract
The new Ce-promoted skeletal Fe catalysts with different Ce contents were prepared through alkali leaching of rapidly quenched ternary FeCeAl alloys and evaluated in the gas-phase Fischer–Tropsch synthesis reaction. N2 physisorption and XRD analysis confirmed the function of Ce as a structural promoter. In the Fischer–Tropsch synthesis reaction, the incorporation of Ce markedly improved the activity and selectivity to C5+ hydrocarbons. Characterizations of the catalysts after Fischer–Tropsch synthesis confirmed the function of Ce as a chemical promoter. We also confirmed that the catalytic activity is associated with the concentrations of the surface polymeric and, to a lesser extent, atomic carbonaceous species and the C5+ selectivity correlated well with the surface concentration of Hägg carbide. We identified a linear relationship between the concentrations of the CeIII cations and Hägg carbide, which clearly substantiated the hypothesis that the chemical effect of Ce is mediated by the Fe0CeIII ensembles facilitating the formation of Hägg carbide.
Co-reporter:Yan Pei, Gongbing Zhou, Nguyen Luan, Baoning Zong, Minghua Qiao and Franklin (Feng) Tao
Chemical Society Reviews 2012 vol. 41(Issue 24) pp:8140-8162
Publication Date(Web):20 Aug 2012
DOI:10.1039/C2CS35182J
Amorphous alloys structurally deviate from crystalline materials in that they possess unique short-range ordered and long-range disordered atomic arrangement. They are important catalytic materials due to their unique chemical and structural properties including broadly adjustable composition, structural homogeneity, and high concentration of coordinatively unsaturated sites. As chemically reduced metal–metalloid amorphous alloys exhibit excellent catalytic performance in applications such as efficient chemical production, energy conversion, and environmental remediation, there is an intense surge in interest in using them as catalytic materials. This critical review summarizes the progress in the study of the metal–metalloid amorphous alloy catalysts, mainly in recent decades, with special focus on their synthetic strategies and catalytic applications in petrochemical, fine chemical, energy, and environmental relevant reactions. The review is intended to be a valuable resource to researchers interested in these exciting catalytic materials. We concluded the review with some perspectives on the challenges and opportunities about the future developments of metal–metalloid amorphous alloy catalysts.
Co-reporter:Bo Sun, Guobin Yu, Jun Lin, Ke Xu, Yan Pei, Shirun Yan, Minghua Qiao, Kangnian Fan, Xiaoxin Zhang and Baoning Zong
Catalysis Science & Technology 2012 vol. 2(Issue 8) pp:1625-1629
Publication Date(Web):01 May 2012
DOI:10.1039/C2CY20155K
A novel Raney Fe@HZSM-5 Fischer–Tropsch synthesis catalyst was synthesized via a facile one-pot strategy using an FeAl alloy as the Fe precursor and as the Al source. Aside from cracking/isomerization of heavy hydrocarbons, HZSM-5 also stabilizes Hägg carbide, resulting in excellent selectivity to gasoline fraction and unexpectedly enhanced C5+ selectivity.
Co-reporter:Gongbing Zhou, Jianliang Liu, Xiaohe Tan, Yan Pei, Minghua Qiao, Kangnian Fan, and Baoning Zong
Industrial & Engineering Chemistry Research 2012 Volume 51(Issue 38) pp:12205-12213
Publication Date(Web):September 11, 2012
DOI:10.1021/ie301302x
Ru–B/ZrO2 catalysts using monoclinic, amorphous, and tetragonal ZrO2 as supports were prepared and used for liquid-phase hydrogenation of benzene to cyclohexene. It is identified that both the Lewis acid sites and the Brønsted acid sites existed on monoclinic ZrO2 (ZrO2-M), while there were only Lewis acid sites on amorphous (ZrO2-A) and tetragonal ZrO2 (ZrO2-T). The amount of acid sites on ZrO2-T was the lowest. In liquid-phase hydrogenation of benzene to cyclohexene, the Ru–B/ZrO2-T catalyst exhibited the highest selectivity and yield of cyclohexene, with the maximum yield of cyclohexene being 47%. These results suggest that for ZrO2-supported Ru–B catalysts, the lower was the amount of acid sites on ZrO2, the higher was the selectivity to cyclohexene. Also, the presence of the Brønsted acid sites on ZrO2 is probably adverse to the selectivity toward cyclohexene.
Co-reporter:Xiaoyu Liu, Pingjun Guo, Songhai Xie, Yan Pei, Minghua Qiao, Kangnian Fan
International Journal of Hydrogen Energy 2012 Volume 37(Issue 8) pp:6381-6388
Publication Date(Web):April 2012
DOI:10.1016/j.ijhydene.2012.01.110
Cu/ZnO catalysts with Cu loadings of 44–5 wt% were prepared by coprecipitation and evaluated in temperature-dependant and shut-down/start-up water–gas shift (WGS) reactions using realistic reformate. These catalysts had similar Cu crystallite sizes, and the metallic Cu surface area and surface Cu content increased with the Cu loading. In temperature-dependent reactions, the CO conversion on the 25wt%Cu/ZnO catalyst slightly exceeded that on 44wt%Cu/ZnO. In shut-down/start-up operation, which is imperative for mobile and residential fuel cell applications, the catalysts with Cu loadings higher than 5 wt% suffered slight activity loss. Among them, the 15wt%Cu/ZnO catalyst deactivated the most reluctantly. As a result, after three shut-down/start-up cycles the CO conversion on 15wt%Cu/ZnO, 25wt%Cu/ZnO, and 44wt%Cu/ZnO became comparable. These results demonstrate the feasibility to lower the Cu loading without degrading the WGS performance of the Cu/ZnO catalyst in shut-down/start-up operation, which will guarantee the operation safety when the catalyst will be operated unattended for domestic small-scale fuel cell applications. Unexpectedly, the CO conversion was doubled on 5wt%Cu/ZnO after one shut-down/start-up cycle, which is interpreted as the redispersion of Cu nanoparticles based on transmission electron microscopy (TEM) and temperature-programmed reduction (TPR).Highlights► The CO conversion on 25wt%Cu/ZnO slightly exceeded that on 44wt%Cu/ZnO in temperature-dependent reactions. ► After three shut-down/start-up cycles, the CO conversions on 15wt%Cu/ZnO and catalysts with higher Cu loadings were comparable. ► The enhanced CO conversion on 5wt%Cu/ZnO after one cycle is attributed to the redispersion of Cu nanoparticles on ZnO.
Co-reporter:Bo Sun;Ke Xu;Luan Nguyen;Dr. Minghua Qiao;Dr. Franklin (Feng) Tao
ChemCatChem 2012 Volume 4( Issue 10) pp:1498-1511
Publication Date(Web):
DOI:10.1002/cctc.201200241
Abstract
Fischer–Tropsch synthesis (FTS) is essential for the transformation of natural gas, coal, and biomass to clean transportation fuels and value-added chemicals. Traditionally, iron catalysts for FTS are predominantly fused iron catalysts and precipitated iron catalysts using silica as the support. Owing to an intense surge in interest in carbon materials during recent years, along with the unique properties of these materials, such as high surface area, high porosity, and ample structures, carbon-supported iron-based FTS catalysts have attracted increasing attention. In this detailed review of the progress of the Fe/C catalysts for FTS in the last three decades, particular emphasis is put on their preparation, characterization, and catalytic performance relevant to the characteristics of carbon materials. This review is intended to be a valuable resource to researchers interested in this exciting field of catalysis, as well as the foundation for those investigating applications of novel carbon materials. A brief discussion is also devoted to the challenges and opportunities regarding the future development of Fe/C FTS catalysts.
Co-reporter:Li Tian, Qiuyun Yang, Zheng Jiang, Yuan Zhu, Yan Pei, Minghua Qiao and Kangnian Fan
Chemical Communications 2011 vol. 47(Issue 21) pp:6168-6170
Publication Date(Web):26 Apr 2011
DOI:10.1039/C1CC11013F
In the challenging crotonaldehyde hydrogenation to crotyl alcohol, an Ag–In/SBA-15 catalyst fabricated by a modified “two solvents” strategy shows an unprecedentedly high yield of 86% at a selectivity of 87%, which exceeds the best results on Pt-, Au- and other Ag-based heterogeneous catalysts reported so far.
Co-reporter:Xianwen Chu, Jun Liu, Bo Sun, Rui Dai, Yan Pei, Minghua Qiao, Kangnian Fan
Journal of Molecular Catalysis A: Chemical 2011 Volume 335(1–2) pp:129-135
Publication Date(Web):1 February 2011
DOI:10.1016/j.molcata.2010.11.024
Co/ZnO catalysts with different Co/Zn ratios have been prepared by the coprecipitation method. It is revealed that below the nominal Co/Zn molar ratio of 2, the calcined Co/ZnO samples were constituted by ZnO and ZnCo2O4 spinel. At the nominal Co/Zn ratio of 2, a small amount of Co3O4 spinel emerged. After reduction, the catalysts were composed of fcc Co and ZnO. In aqueous-phase reforming (APR) of ethylene glycol, it is found that the intrinsic activity and selectivity to H2 increase with the increment of the ZnO content. H2 selectivities over the Co/ZnO catalysts ranged from 52% to 89%, which are substantially higher than that of the Raney Ni catalyst at similar conversion. Moreover, the Co/ZnO catalysts produced much less CO in the product gas. With the aid of literature works as well as additional experiments on APR of acetic acid, methanol, and ethanol, the reaction pathways of ethylene glycol in the presence of water on the Co/ZnO catalysts were discussed.Graphical abstractResearch highlights▶ Co/ZnO catalysts were prepared by the coprecipitation method. ▶ They exhibit high intrinsic activity and H2 selectivity in APR of ethylene glycol. ▶ The reaction pathways are discussed.
Co-reporter:Bo Sun;Dr. Minghua Qiao; Kangnian Fan;Jeffrey Ulrich;Dr. Franklin (Feng) Tao
ChemCatChem 2011 Volume 3( Issue 3) pp:542-550
Publication Date(Web):
DOI:10.1002/cctc.201000352
Abstract
For sustainable fuel production from alternative energy sources, it is important to design and develop Fischer–Tropsch synthesis (FTS) catalysts for hydrocarbons that deviate from the Anderson-Schulz–Flory distribution. The introduction of a molecular sieve to a conventional FTS catalyst system offers the opportunity to confine spatially the chain length of the hydrocarbons, and to convert long-chain hydrocarbons to molecules more suitable as transportation fuels. The incorporation of metal nanoparticles in a variety of molecular sieves with different methods allows a versatile means to modulate the distribution of the FTS hydrocarbons for different purposes.
Co-reporter:Zhiying Lou, Xueying Chen, Li Tian, Minghua Qiao, Kangnian Fan, Heyong He, Xiaoxin Zhang, Baoning Zong
Journal of Molecular Catalysis A: Chemical 2010 326(1–2) pp: 113-120
Publication Date(Web):
DOI:10.1016/j.molcata.2010.04.018
Co-reporter:Jun Liu;Xianwen Chu;Lingjun Zhu;Jiye Hu;Rui Dai;Songhai Xie Dr.;Yan Pei Dr.;Shirun Yan Dr.;Minghua Qiao ;Kangnian Fan
ChemSusChem 2010 Volume 3( Issue 7) pp:803-806
Publication Date(Web):
DOI:10.1002/cssc.201000093
Co-reporter:Guobin Yu ; Bo Sun ; Yan Pei ; Songhai Xie ; Shirun Yan ; Minghua Qiao ; Kangnian Fan ; Xiaoxin Zhang ;Baoning Zong
Journal of the American Chemical Society 2009 Volume 132(Issue 3) pp:935-937
Publication Date(Web):December 22, 2009
DOI:10.1021/ja906370b
We demonstrate a one-pot hydrothermal cohydrolysis−carbonization process using glucose and iron nitrate as starting materials for the fabrication of carbonaceous spheres embedded with iron oxide nanoparticles. It is verified by TEM, 57Fe Mössbauer, and Fe K-edge XAS that iron oxide nanoparticles are highly dispersed in the carbonaceous spheres, leading to a unique microstructure. A formation mechanism is also proposed. This route is also applicable to a range of other naturally occurring saccharides and metal nitrates. A catalytic study revealed the remarkable stability and selectivity of the reduced FexOy@C spheres in the Fischer−Tropsch synthesis, which clearly exemplifies the promising application of such materials.
Co-reporter:Pingjun Guo, Liangfeng Chen, Qiuyun Yang, Minghua Qiao, Hui Li, Hexing Li, Hualong Xu, Kangnian Fan
International Journal of Hydrogen Energy 2009 Volume 34(Issue 5) pp:2361-2368
Publication Date(Web):March 2009
DOI:10.1016/j.ijhydene.2008.12.081
The Cu/ZnO/Al2O3 catalysts were prepared by the coprecipitation method, and were evaluated in the water–gas shift (WGS) reaction. The effects of the calcination temperature on the BET surface area and crystallite size were characterized. In WGS reaction, the Cu/ZnO/Al2O3 catalysts suffered from continuous deactivation in shut-down/start-up operation – the daily requirement for mobile and residential fuel cell systems. Among them, the Cu/ZnO/Al2O3 catalyst prepared at the calcination temperature of 450 °C showed the best activity and stability, with the decrement of the CO conversion of only 12.8% after three shut-down/start-up cycles. Deactivation of the Cu/ZnO/Al2O3 catalysts is attributed to the blocking or deterioration of the active sites by Zn6Al2(OH)16CO3·4H2O resulting from the degeneration of the oxides under cyclic operations. Removal of the hydroxycarbonate species by calcination in air followed by re-reduction could restore the steady-state WGS activity; however, the regenerated catalyst underwent much severe deactivation in subsequent shut-down/start-up operation.
Co-reporter:Shuai WANG;Wu-Li YANG;Guo-Bin YU;Song-Hai XIE;Kang-Nian FAN
Chinese Journal of Chemistry 2008 Volume 26( Issue 7) pp:1191-1194
Publication Date(Web):
DOI:10.1002/cjoc.200890217
Abstract
The first preparation of amorphous Ni-P/PS (polystyrene) core-shell and Ni-P hollow microspheres was performed using a surface seeding-electroless plating method. The preliminary magnetic properties of the amorphous Ni-P hollow sphere were investigated and compared with those of the Ni hollow sphere.
Co-reporter:Yan Pei;Shuai Wang;Qin Zhou;Song-Hai Xie;Zhi-Yu Jiang;Kang-Nian Fan
Chinese Journal of Chemistry 2007 Volume 25(Issue 9) pp:1385-1388
Publication Date(Web):17 SEP 2007
DOI:10.1002/cjoc.200790256
Single crystalline SnO nanosheets with high aspect ratios have been synthesized by a simple solution-based chemical route aided with sonication. The dimension and thickness of the SnO nanosheets are controllable by adjusting the amount of cetyltrimethyl ammonium bromide (CTAB) added. The as-prepared SnO nanosheets have loosely packed {001} surfaces and expanded lattice, thus rendering a high reversible capacity approaching the theoretical value of SnO as anode material in Li secondary battery.
Co-reporter:Jianqiang Wang, Youzhen Wang, Minghua Qiao, Songhai Xie, Kangnian Fan
Materials Letters 2007 Volume 61(Issue 28) pp:5074-5077
Publication Date(Web):November 2007
DOI:10.1016/j.matlet.2004.07.068
Attempts have been made to prepare alumina nanofibers by hydrolyzing aluminum nitrate in the presence of hexamethylenetetramine (HMTA) followed by the supercritical fluid drying (SCFD) process. The samples were characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM) and nitrogen physisorption. The results show that δ-Al2O3 nanofibers with diameter of 2 nm, length of 50 nm and with BET surface areas of 412.6 m2 g− 1 were successfully synthesized. The thermal evolution of the fibers and the role of hexamethylenetetramine were also briefly discussed.
Co-reporter:Shuai Wang, Songhai Xie, Hexing Li, Shirun Yan, Kangnian Fan and Minghua Qiao
Chemical Communications 2005 (Issue 4) pp:507-509
Publication Date(Web):02 Dec 2004
DOI:10.1039/B414913K
Square and round single crystalline SnO platelets have been prepared in a solution-based chemical route aided with sonication at room temperature.
Co-reporter:Yan Pei, Jianqiang Wang, Qiang Fu, Pingjun Guo, Minghua Qiao, Shirun Yan and Kangnian Fan
New Journal of Chemistry 2005 vol. 29(Issue 8) pp:992-994
Publication Date(Web):16 Jun 2005
DOI:10.1039/B505701A
A nanosized amorphous Co–Fe–B catalyst exhibited higher selectivity and yield to crotyl alcohol than noble Pt-based catalysts in the hydrogenation of crotonaldehyde and could be prepared by a facile chemical reduction method.
Co-reporter:Jianqiang Wang, Pingjun Guo, Shirun Yan, Minghua Qiao, Hexing Li, Kangnian Fan
Journal of Molecular Catalysis A: Chemical 2004 Volume 222(1–2) pp:229-234
Publication Date(Web):15 November 2004
DOI:10.1016/j.molcata.2004.08.009
A colloidal RuB/Al2O3·xH2O catalyst has been synthesized through a combined coprecipitation–crystallization–reduction strategy and characterized in detail with techniques including ICP-AES, N2 physisorption, XRD, TG/DTA, PSD and TEM. The catalytic behavior in liquid phase selective hydrogenation of benzene to cyclohexene was studied and compared with that of the RuB/γ-Al2O3 catalyst prepared by the incipient-wetness impregnation method. The RuB/Al2O3·xH2O catalyst is found more reactive than the RuB/γ-Al2O3 catalyst, and the maximum yield of cyclohexene is about four times as high as that over the latter. The better activity of the colloidal catalyst is assigned to the higher dispersion of the smaller RuB particles, whereas its superior selectivity is attributed to the improved hydrophilicity due to higher content of structural water and surface hydroxyl groups.A novel colloidal RuB/Al2O3·xH2O catalyst exhibiting superior catalytic performance to the RuB/γ-Al2O3 catalyst in liquid phase selective hydrogenation of benzene was prepared by a combined coprecipitation–crystallization–reduction strategy.
Co-reporter:Yan Pei, Huarong Hu, Jing Fang, Minghua Qiao, Weilin Dai, Kangnian Fan, Hexing Li
Journal of Molecular Catalysis A: Chemical 2004 Volume 211(1–2) pp:243-249
Publication Date(Web):15 March 2004
DOI:10.1016/j.molcata.2003.10.023
The promoting effect of tin (Sn) on the liquid phase hydrogenation of crotonaldehyde over amorphous Co–B catalyst has been investigated. SnCl2 or SnCl4 was introduced to the reactant before hydrogenation or incorporated to the Co–B catalyst during the reduction of CoCl2 by potassium borohydride. The overall activity of the Co–B catalyst was suppressed upon the addition of the tin salts in the reactant. However, an appropriate amount of either tin salt remarkably improved the reactivity towards the CO bond, thus leading to a higher selectivity and yield of crotyl alcohol. On the other hand, incorporation of tin to the catalyst by co-reduction was mainly against the formation of crotyl alcohol. SnCl2 caused a sharp drop of the reactivity towards the CO bond rather than the CC bond. Although SnCl4 increased both the reactivities of the CO and CC bonds, the former increased to a less extent than the latter. Their different catalytic behavior was tentatively interpreted on the basis of XPS measurements.Four kinds of tin (Sn)-promoted amorphous Co–B catalysts have been investigated in the liquid phase hydrogenation of crotonaldehyde. The 1% SnCl4 Co–B catalyst showed a high selectivity to crotyl alcohol by depressing the reactivity of the CC bond while increasing the reactivity of the CO bond.
Co-reporter:Gongbing Zhou, Yan Pei, Zheng Jiang, Kangnian Fan, Minghua Qiao, Bin Sun, Baoning Zong
Journal of Catalysis (March 2014) Volume 311() pp:393-403
Publication Date(Web):1 March 2014
DOI:10.1016/j.jcat.2013.12.022
•B-doped ZrO2 (B-ZrO2) with various acid amounts (nNH3) from NH3-TPD were prepared.•The Ru/B-ZrO2 catalysts were evaluated in benzene hydrogenation to cyclohexene.•The turnover frequency of benzene was linearly proportional to nNH3.•B doping enabled a maximum initial selectivity (S0) of 88% toward cyclohexene.•A volcanic evolution trend between S0 and nNH3 was unveiled.The B-doped ZrO2 (B-ZrO2) samples with different B/Zr ratios were synthesized using zirconium oxychloride and boric acid as the precursors. Their crystallographic phase retained as tetragonal ZrO2 after the doping of B; however, the amount of the Lewis acid sites increased from 46.1 μmolNH3 g−1 on ZrO2 to 100.6 μmolNH3 g−1 on B-ZrO2(1/10) with the nominal B/Zr molar ratio of 1/10. The Ru/B-ZrO2 catalysts were then prepared by chemical reduction, and their electronic and structural properties were systematically characterized by spectroscopic techniques. It is identified that the Ru nanoparticles (NPs) supported on these B-ZrO2 samples exhibited similar size, chemical state, and microstructure. In the partial hydrogenation of benzene, the turnover frequency of benzene was linearly proportional to the amount of the acid sites on the supports, whereas the selectivity toward cyclohexene displayed a volcanic evolution passing through a maximum of 88% on the Ru/B-ZrO2(1/15) catalyst. Kinetic analysis indicated that the acid sites improved the rate constants of the benzene to cyclohexene step (k1) and the cyclohexene to cyclohexane step (k2) to different degrees. The resulting k1/k2 ratio increased from 3.7 × 10−2 l mol−1 (Ru/ZrO2) to 4.8 × 10−2 l mol−1 (Ru/B-ZrO2(1/15)), and then declined to 4.1 × 10−2 l mol−1 (Ru/B-ZrO2(1/10)), which explained the volcanic evolution of the selectivity toward cyclohexene with respect to the acid amount.Graphical abstractDownload high-res image (95KB)Download full-size image
Co-reporter:Xiaoyu Liu, Pingjun Guo, Bin Wang, Zheng Jiang, Yan Pei, Kangnian Fan, Minghua Qiao
Journal of Catalysis (April 2013) Volume 300() pp:152-162
Publication Date(Web):1 April 2013
DOI:10.1016/j.jcat.2013.01.001
The deactivation mechanisms of the Au/CeO2 catalyst in steady-state and shutdown/start-up WGS reactions were investigated in realistic reformate at 250 °C. Catalyst deactivation due to sintering was excluded. After steady-state operation, the original activity was not recovered by removing the deposited carbonate species. The influences of the component gases of realistic reformate on the activity suggest that loss of the Au–CeO2 interaction caused by the reducing H2 and CO is the main reason for catalyst deactivation. Under the shutdown/start-up condition, the catalyst suffered more drastic deactivation, although it underwent a lesser degree of reduction. A good correlation between the extent of deactivation and the amount of the carbonate species indicates that catalyst deactivation is mainly caused by enhanced formation of the carbonate species, especially through a combined effect of CO2 and H2O, during the low-temperature shutdown and start-up steps. The implications of these findings for improved applications of the Au/CeO2 catalyst in WGS are indicated.Graphical abstractThe deactivation behavior of the Au/CeO2 catalyst in steady-state and shutdown/start-up WGS reactions was investigated. The loss of Au–CeO2 interaction by reduction and carbonate deposition were, respectively, identified as accounting for catalyst deactivation under these situations.Download high-res image (183KB)Download full-size imageHighlights► Deactivation mechanisms of the Au/CeO2 catalyst in WGS reaction were investigated. ► Effects of component gases of realistic reformate on the activity were discriminated. ► Deactivation in steady-state operation is mainly caused by the loss of Au–CeO2 interaction by reduction. ► Deactivation in shutdown/start-up operation is attributed to carbonate deposition. ► Shutdown and start-up in H2O or H2 may effectively avoid catalyst deactivation.
Co-reporter:Jun Liu, Bo Sun, Jiye Hu, Yan Pei, Hexing Li, Minghua Qiao
Journal of Catalysis (9 September 2010) Volume 274(Issue 2) pp:287-295
Publication Date(Web):9 September 2010
DOI:10.1016/j.jcat.2010.07.014
A high-performance Pd/Fe3O4 catalyst for aqueous-phase reforming (APR) of ethylene glycol (EG) to H2 was prepared facilely by the co-precipitation method. After proper activation, the Pd was present as highly dispersed metallic nanoparticles with dimension of <3 nm, and the Fe was present as magnetite. When compared to Pd catalyst supported on Fe2O3, NiO, Cr2O3, Al2O3, or ZrO2 prepared by incipient wetness impregnation, the Pd/Fe3O4 catalyst displayed superior catalytic performance in terms of activity, selectivity, and stability. The intrinsic activity of the Pd/Fe3O4 catalyst was about three times of that of the second most active Pd/Fe2O3 catalyst under the same reaction conditions. In addition, the Pd/Fe3O4 catalyst retained ∼80% of its initial activity after reaching the steady-state. Notably, the Pd/Fe3O4 catalyst possessed the highest turnover frequency of H2 (109 min−1) reported so far, showing its promise as a new practical catalyst for APR of biomass-derived oxygenates to H2. The excellent catalytic performance of the Pd/Fe3O4 catalyst was attributed to the enhanced synergistic effect between small Pd nanoparticles and magnetite in promoting the water–gas shift reaction, the rate-determining step in APR of EG over Pd-based catalysts.The Pd/Fe3O4 catalyst prepared by co-precipitation exhibited the best catalytic performance in aqueous-phase reforming of ethylene glycol to H2 than Pd supported on various metal oxides prepared by incipient wetness impregnation.Download high-res image (23KB)Download full-size image
Co-reporter:Jian-Liang Liu, Yuan Zhu, Jun Liu, Yan Pei, Zhen Hua Li, Hui Li, He-Xing Li, Ming-Hua Qiao, Kang-Nian Fan
Journal of Catalysis (15 November 2009) Volume 268(Issue 1) pp:100-105
Publication Date(Web):15 November 2009
DOI:10.1016/j.jcat.2009.09.007
CdSO4 and ZnSO4 as co-modifiers of RuLa/SBA-15 lead to improved catalysts for the partial hydrogenation of benzene to cyclohexene. Based on the experimental results and theoretical calculations, it is shown that CdSO4 acts as surface modification, suppressing more the adsorption of cyclohexene than that of benzene, while the function of ZnSO4 is mainly the stabilization of cyclohexene in the liquid phase, accelerating the desorption as well as hindering the re-adsorption of cyclohexene.CdSO4 and ZnSO4 act as co-modifiers for RuLa/SBA-15 catalyst to enhance the selectivity in the partial hydrogenation of benzene to cyclohexene suppressing re-adsorption and stabilizing cyclohexene, respectively.Download high-res image (75KB)Download full-size image
Co-reporter:Qiu-Yun Yang, Yuan Zhu, Li Tian, Song-Hai Xie, Yan Pei, Hui Li, He-Xing Li, Ming-Hua Qiao, Kang-Nian Fan
Applied Catalysis A: General (15 November 2009) Volume 369(Issues 1–2) pp:67-76
Publication Date(Web):15 November 2009
DOI:10.1016/j.apcata.2009.08.032
Co-reporter:Liang-Feng Chen, Ping-Jun Guo, Ling-Jun Zhu, Ming-Hua Qiao, Wei Shen, Hua-Long Xu, Kang-Nian Fan
Applied Catalysis A: General (15 March 2009) Volume 356(Issue 2) pp:129-136
Publication Date(Web):15 March 2009
DOI:10.1016/j.apcata.2008.12.029
Co-reporter:Yan Pei, Pingjun Guo, Minghua Qiao, Hexing Li, Shiqiang Wei, Heyong He, Kangnian Fan
Journal of Catalysis (10 June 2007) Volume 248(Issue 2) pp:303-310
Publication Date(Web):10 June 2007
DOI:10.1016/j.jcat.2007.03.024
Binary CoB and ternary CoFeB amorphous alloy catalysts with different Fe contents were prepared by the chemical reduction method. In liquid-phase hydrogenation of crotonaldehyde, incorporation of Fe into the CoB catalyst reduced the overall activity while effectively improving the selectivity and yield to crotyl alcohol. On the optimum CoFeB-3 catalyst with a nominal Fe/(Co + Fe) molar ratio of 0.6, the initial selectivity amounted to 71%, and the yield of crotyl alcohol reached 63%. It is found that the selectivity enhancement was due to the lower decrement in the intrinsic formation rate of crotyl alcohol compared with that of butanal, not to the increment in the activation of the CO bond. Based on the characterizations, including X-ray photoelectron spectroscopy and X-ray absorption spectroscopy, and previous findings, the enhanced selectivity from Fe modification was tentatively attributed to an ensemble size effect.
Co-reporter:Yuan Zhu, Li Tian, Zheng Jiang, Yan Pei, Songhai Xie, Minghua Qiao, Kangnian Fan
Journal of Catalysis (1 July 2011) Volume 281(Issue 1) pp:106-118
Publication Date(Web):1 July 2011
DOI:10.1016/j.jcat.2011.04.007
Au/Fe3O4 catalysts with flowerlike and particulate morphologies have been prepared by homogeneous deposition–precipitation of gold on hematite materials synthesized in different ways, followed by integrative reduction. HRTEM revealed the heteroepitaxial growth of gold crystallites on flowerlike magnetite materials along the {1 1 1} planes, which may account for their smaller and more uniform gold nanoparticles. The stronger metal-support interaction on flowerlike Au/Fe3O4 catalysts was also manifested by the higher reduction temperature of gold than that on particulate magnetite-supported catalysts. In liquid phase hydrogenation of crotonaldehyde, the flowerlike Au/Fe3O4 catalysts show high selectivity (⩾76%) in the entire reaction course and high yield (⩾75%) to crotyl alcohol. They also display excellent separation and recycling characteristics. A perimeter interface mechanism involving the hydroxyl groups on magnetite and the positively charged gold atoms linked to the lattice oxygen of magnetite is established to address the remarkably high selectivity over the flowerlike Au/Fe3O4 catalysts.Graphical abstractGold supported on flowerlike magnetite shows excellent catalytic performance in liquid phase hydrogenation of crotonaldehyde to crotyl alcohol. A perimeter interface mechanism is established to account for its superior selectivity.Download high-res image (75KB)Download full-size imageHighlights► Au/Fe3O4 catalysts with flowerlike morphology have been prepared. ► Heteroepitaxial growth of Au NPs along the {1 1 1} planes of magnetite was identified. ► This catalyst showed high selectivity to CROL in liquid phase hydrogenation of CRAL. ► A perimeter interface mechanism is proposed to address the high selectivity.
Co-reporter:Liang-Feng Chen, Ping-Jun Guo, Ming-Hua Qiao, Shi-Run Yan, He-Xing Li, Wei Shen, Hua-Long Xu, Kang-Nian Fan
Journal of Catalysis (1 July 2008) Volume 257(Issue 1) pp:172-180
Publication Date(Web):1 July 2008
DOI:10.1016/j.jcat.2008.04.021
Cu/SiO2 catalysts prepared by the ammonia-evaporation (AE) method have been systematically characterized focusing on the effect of the AE temperature during catalyst preparation. It is found that the texture, composition, and structure of the calcined and reduced Cu/SiO2 catalysts were profoundly affected by the AE temperature. Based on characterizations and previous findings, the copper species on calcined Cu/SiO2 samples and reduced Cu/SiO2 catalysts were assigned. In gas-phase hydrogenation of dimethyl oxalate (DMO) to ethylene glycol (EG), the evolution of the catalytic activity with the Cu0 and Cu+ surface areas suggested that Cu+ also participated in the hydrogenation process. The cooperative effect between Cu0 and Cu+ is proposed to be responsible for the highest hydrogenation activity of the Cu/SiO2 catalyst prepared at the AE temperature of 363 K, on which an EG yield of 98% was obtained under the optimized hydrogenation conditions.
Co-reporter:Jian-Liang Liu, Ling-Jun Zhu, Yan Pei, Ji-Hua Zhuang, Hui Li, He-Xing Li, Ming-Hua Qiao, Kang-Nian Fan
Applied Catalysis A: General (1 February 2009) Volume 353(Issue 2) pp:282-287
Publication Date(Web):1 February 2009
DOI:10.1016/j.apcata.2008.10.056
Co-reporter:Yan Pei, Gongbing Zhou, Nguyen Luan, Baoning Zong, Minghua Qiao and Franklin (Feng) Tao
Chemical Society Reviews 2012 - vol. 41(Issue 24) pp:NaN8162-8162
Publication Date(Web):2012/08/20
DOI:10.1039/C2CS35182J
Amorphous alloys structurally deviate from crystalline materials in that they possess unique short-range ordered and long-range disordered atomic arrangement. They are important catalytic materials due to their unique chemical and structural properties including broadly adjustable composition, structural homogeneity, and high concentration of coordinatively unsaturated sites. As chemically reduced metal–metalloid amorphous alloys exhibit excellent catalytic performance in applications such as efficient chemical production, energy conversion, and environmental remediation, there is an intense surge in interest in using them as catalytic materials. This critical review summarizes the progress in the study of the metal–metalloid amorphous alloy catalysts, mainly in recent decades, with special focus on their synthetic strategies and catalytic applications in petrochemical, fine chemical, energy, and environmental relevant reactions. The review is intended to be a valuable resource to researchers interested in these exciting catalytic materials. We concluded the review with some perspectives on the challenges and opportunities about the future developments of metal–metalloid amorphous alloy catalysts.
Co-reporter:Yi Cheng, Yiqiu Fan, Yan Pei and Minghua Qiao
Catalysis Science & Technology (2011-Present) 2015 - vol. 5(Issue 8) pp:NaN3916-3916
Publication Date(Web):2015/05/29
DOI:10.1039/C5CY00630A
Graphene, a two dimensional (2D) material bearing a single layer of an sp2 carbon atom network densely packed in a honeycomb structure, has attracted worldwide attention since its first experimental isolation in 2004. The unique properties of graphene, such as its large surface area, 2D structure, high adsorption capacity, excellent electrical and thermal conductivity, high mechanical strength, and easiness of modification, make it an ideal catalyst support. Therefore, research studies in this field are boosting and progress has been witnessed in the past few years. This review concentrates on recent advances in the synthesis and catalytic applications of graphene-supported metal/metal oxide nanohybrids and is woven around reactions including petrochemical, fine chemical, energy and environment-relevant reactions, with special emphasis on the contribution of graphene to the catalytic performance. Finally, a brief summary and an outlook on some of the scientific challenges and opportunities in this field are given.
Co-reporter:Bo Sun, Guobin Yu, Jun Lin, Ke Xu, Yan Pei, Shirun Yan, Minghua Qiao, Kangnian Fan, Xiaoxin Zhang and Baoning Zong
Catalysis Science & Technology (2011-Present) 2012 - vol. 2(Issue 8) pp:NaN1629-1629
Publication Date(Web):2012/05/01
DOI:10.1039/C2CY20155K
A novel Raney Fe@HZSM-5 Fischer–Tropsch synthesis catalyst was synthesized via a facile one-pot strategy using an FeAl alloy as the Fe precursor and as the Al source. Aside from cracking/isomerization of heavy hydrocarbons, HZSM-5 also stabilizes Hägg carbide, resulting in excellent selectivity to gasoline fraction and unexpectedly enhanced C5+ selectivity.
Co-reporter:Li Tian, Qiuyun Yang, Zheng Jiang, Yuan Zhu, Yan Pei, Minghua Qiao and Kangnian Fan
Chemical Communications 2011 - vol. 47(Issue 21) pp:NaN6170-6170
Publication Date(Web):2011/04/26
DOI:10.1039/C1CC11013F
In the challenging crotonaldehyde hydrogenation to crotyl alcohol, an Ag–In/SBA-15 catalyst fabricated by a modified “two solvents” strategy shows an unprecedentedly high yield of 86% at a selectivity of 87%, which exceeds the best results on Pt-, Au- and other Ag-based heterogeneous catalysts reported so far.
