Co-reporter:Liya Hu, Cheng Wang, Bin Yue, Xueying Chen, Heyong He
Materials Today Communications 2017 Volume 11(Volume 11) pp:
Publication Date(Web):1 June 2017
DOI:10.1016/j.mtcomm.2017.02.005
Highly ordered mesoporous carbon of body-centered cubic structure was synthesized by the evaporation induced self-assembly method using Pluronic F127 and phenolic resol as the template and carbon source, respectively. Vanadium species were introduced to the carbon support by both co-assembly and impregnation strategies for comparison. Ordered mesoporous carbon nanoparticles of the same body-centered cubic structure were also synthesized via a facile soft-template method, followed by the incorporation of vanadium species via impregnation. The obtained three different series of vanadium-containing carbon catalysts were tested in the direct benzene hydroxylation reaction using H2O2 as an oxidant. The vanadium supporting mesoporous carbon nanoparticles, due to the open framework and short channels for fast reactants diffusion and the easily accessible active vanadium species for reactants activation, exhibited superior catalytic activity to other series of catalysts. Particularly, the 4V/MCN-S catalyst showed the best catalytic performance among the studied catalysts with a benzene conversion of 38.2% and phenol selectivity of 96.1%, along with good stability during five recycles.Download high-res image (140KB)Download full-size image
Co-reporter:Jie Li, Lin-Ping Qian, Li-Ya Hu, Bin Yue, He-Yong He
Chinese Chemical Letters 2016 Volume 27(Issue 7) pp:1004-1008
Publication Date(Web):July 2016
DOI:10.1016/j.cclet.2016.03.021
The pseudo-boehmite derived alumina supported metal (Cu, Co and Ni) catalysts prepared by the impregnation method were investigated in hydrogenation of maleic anhydride (MA) to succinic anhydride (SA) and γ-butyrolactone. The catalysts were characterized by ICP-AES, N2 adsorption–desorption, XRD, H2-TPR, CO-TPD, dissociative N2O adsorption and TEM and the results showed that the alumina possessed mesoporous feature and the metal species were well dispersed on the support. Compared to Cu/Al2O3 and Co/Al2O3, Ni/Al2O3 exhibited higher catalytic activity in the MA hydrogenation with 92% selectivity to SA and nearly 100% conversion of MA at 140 °C under 0.5 MPa of H2 with a weighted hourly space velocity of 2 h−1 (MA). The stability of Ni/Al2O3 catalyst was also investigated.Al2O3 supported Cu, Co and Ni catalysts with high dispersion were obtained by the impregnation method. Ni/Al2O3 showed the highest catalytic performance with ∼100% MA conversion at 140 °C and 0.5 MPa of H2.
Co-reporter:Yichen Hu, Bin Guo, Yingyi Fu, Yuanhang Ren, Gangfeng Tang, Xueying Chen, Bin Yue and Heyong He
Chemical Communications 2015 vol. 51(Issue 75) pp:14219-14222
Publication Date(Web):10 Aug 2015
DOI:10.1039/C5CC04548G
Sulfated titania solid superacids with dominant {001}, {001}/{101}, and {101} facets were prepared by the hydrothermal method and subsequent sulfation. Their facet-dependent acidic properties were investigated by the solid-state 31P NMR technique and Pechmann condensation of 5,7-dihydroxy-4-methyl coumarin.
Co-reporter:Min Gu;Yuanhang Ren;Yichen Hu;Min Tang;Zuping Kong;Heyong He
European Journal of Inorganic Chemistry 2015 Volume 2015( Issue 3) pp:488-493
Publication Date(Web):
DOI:10.1002/ejic.201402938
Abstract
The reactions of silicotungstate, 2,5-bis(3-pyridyl)-1,3,4-oxadiazole (3-bpo), and copper, cobalt, or nickel acetate under hydrothermal condition yield the three compounds [(SiW12O40)Cu2(3-bpo)2(C5H4NCOOH)2]·H2O (1), [(SiW12O40)Co2(3-bpo)2(C5H4NCOOH)2(H2O)2]·2H2O (2), and [(SiW12O40)Ni2(3-bpo)2(C5H4NCOOH)2(H2O)2]·3H2O (3), respectively, in which the nicotinic acid ligands are generated from the in situ decomposition of 3-bpo during the hydrothermal process. In the three structures, the polyoxometalate (POM) serves as the center and is imbedded within the dimetallic cyclic [M2(3-bpo)2(C5H4NCOOH)2]4+ moiety through coordination bonds to form infinite one-dimensional (1D) supramolecular snadwich-like structures. Owing to the difference in the metal ions, the packing style of [Cu2(3-bpo)2(C5H4NCOOH)2]4+ is different from that of [M2(3-bpo)2(C5H4NCOOH)2]4+ (M = Co, Ni). The electrochemical behaviors of compounds 1–3 were studied by cyclic voltammetry.
Co-reporter:Yingyi Fu;Yanan Wu;Wenjia Cai;Heyong He
Science China Chemistry 2015 Volume 58( Issue 1) pp:148-155
Publication Date(Web):2015 January
DOI:10.1007/s11426-014-5251-3
A series of Ce-promoted 6.7% Ni-containing mesoporous silica (Ce-Ni-SiO2) with varying Ce content (0.5%–4.8%) was prepared using the evaporation-induced self-assembly method. The characterization results showed that Ce and Ni species were homogeneously incorporated into the mesoporous silica matrix. The catalytic properties of these samples in the dry reforming of methane reaction revealed that the catalysts (e.g., 1.2% Ce-Ni-SiO2) containing highly dispersed small Ni particles exhibited excellent catalytic activity and long-term stability, which is attributed to the anchoring effect of the Ce and its ability to increase surface oxygen species concentration.
Co-reporter:Wen-Jia Cai, Lin-Ping Qian, Bin Yue, He-Yong He
Chinese Chemical Letters 2014 Volume 25(Issue 11) pp:1411-1415
Publication Date(Web):November 2014
DOI:10.1016/j.cclet.2014.06.016
A series of SBA-15 supported bimetallic Rh–Ni catalysts with different weight ratio of Rh/Ni in the range of 0–0.04 were prepared for carbon dioxide reforming of methane. The doping effect of Rh on catalytic activity as well as carbon accumulation and removal over the catalysts was studied. The characterization results indicated that the addition of a small amount of Rh promoted the reducibility of Ni particles and decreased the Ni particle size. During the dry reforming reaction, the carbon deposition was originated from CH4 decomposition and CO disproportionation. The Rh–Ni catalyst with small metallic particle size inhibited the carbon formation and exhibited high efficiency in the removal of coke. In comparison with bare Ni-based catalyst, the Rh–Ni bimetallic catalysts showed high activity and stability in the dry reforming of methane.In comparison with bare Ni-based catalyst, the Rh–Ni catalyst with smaller Ni particle size exhibited high efficiency in the removal of coke and showed high activity and stability in the dry reforming of methane.
Co-reporter:Yichen Hu;Yuanhang Ren;Gangfeng Tang;Cheng Wang;Min Tang;Heyong He
Chinese Journal of Chemistry 2014 Volume 32( Issue 11) pp:1151-1156
Publication Date(Web):
DOI:10.1002/cjoc.201400383
Abstract
TiO2 nanosheets with dominant {001} facets, coupled with Cs2.5H0.5PW12O40, were successfully synthesized by a one-step hydrothermal reaction. The photocatalytic activity of nanocatalysts was evaluated by the degradation of Rhodamine B under UV light irradiation. The results showed that both the addition of Cs2.5H0.5PW12O40 and the exposed {001} facets of TiO2 have a positive effect on the photocatalytic activity. The improved photoactivity of nanocomposites in comparison with that of TiO2 nanosheets could be attributed to the synergistic effect between Cs2.5H0.5PW12O40 and TiO2 which facilitates the separation of photo-induced hole-electron pairs.
Co-reporter:Yuanhang Ren, Yichen Hu, Yucheng Shan, Zuping Kong, Min Gu, Bin Yue, Heyong He
Inorganic Chemistry Communications 2014 40() pp: 108-111
Publication Date(Web):
DOI:10.1016/j.inoche.2013.11.037
Co-reporter:Li Zhang, Bin Yue, Yuanhang Ren, Xueying Chen and Heyong He
Catalysis Science & Technology 2013 vol. 3(Issue 8) pp:2113-2118
Publication Date(Web):02 May 2013
DOI:10.1039/C3CY00121K
Aluminum doped cesium salts of tungstophosphoric acid, AlxCs2.5–3xH0.5PW12O40 (x = 0.05, 0.1 and 0.15), were prepared via a solid state synthesis method and their catalytic activity in n-butane isomerization reaction was tested using the 13C MAS NMR technique and 1-13C-n-butane as the reactant. All AlxCs2.5–3xH0.5PW12O40 catalysts show higher catalytic activity than Cs2.5H0.5PW12O40. Among them, Al0.1Cs2.2H0.5PW12O40 exhibits the best performance. The MAS NMR technique was further employed to characterize the acidity of the catalysts using trimethylphosphine and 2-13C-acetone as the basic probe molecules. Al0.1Cs2.2H0.5PW12O40 possesses higher Brönsted acid strength than Cs2.5H0.5PW12O40, which parallels the activity of the catalysts. For a catalyst used in n-butane isomerization reaction, to enhance its Brönsted acid strength rather than to increase its acid density is more important for improving the activity of the catalyst.
Co-reporter:Yuan-hang Ren;Yi-chen Hu;Zu-ping Kong;Min Gu, ;He-yong He
European Journal of Inorganic Chemistry 2013 Volume 2013( Issue 10-11) pp:1821-1826
Publication Date(Web):
DOI:10.1002/ejic.201201374
Abstract
Three polymeric polyoxometalate (POM) compounds, [PMoVI10MoV2O39](C2N4H4)2[(CH3)4N]3·H2O (1), [PW11CuO39]2·[Cu(en)2H2O]4·[(CH3)4N]2·6H2O (en = ethenediamine) (2), and [SiW11CuO39]2·[Cu(en)2]4·[Cu(en)2H2O]2·10H2O (3) were isolated under hydrothermal conditions. Compound 1 contains one-dimensional twisted poly-Keggin chains that consist of two-electron-reduced Keggin units through MoV–Ot–MoV bridges. Compounds 2 and 3 contain one-dimensional twisted poly-Keggin chains that consist of Cu-monosubstituted Keggin units through W–Ot–Cu bridges. Twisted chains are formed due to the different orientations of the Keggin units during polymerization. The compounds were characterized by single-crystal X-ray diffraction, elemental analysis, IR, X-ray photoelectron spectroscopy (XPS), thermogravimetry (TG), and cyclic voltammetry. The driving force for polymerization by the sharing of a terminal oxygen atom per POM unit likely arises from the existence of a low-valence metal (MoV or CuII), which reduces the charge density of each POM unit.
Co-reporter:Wen-Jia Cai, Lin-Ping Qian, Bin Yue, Xue-Ying Chen, He-Yong He
Chinese Chemical Letters 2013 Volume 24(Issue 9) pp:777-779
Publication Date(Web):September 2013
DOI:10.1016/j.cclet.2013.05.034
A series of Co/Mg–Al oxide samples, CoMgAl-x (x = (Mg + Co)/Al molar ratio of 1–5), were prepared by the self-combustion method followed by H2 reduction. The catalytic performance and stability of the samples were studied in dry reforming of CH4. XRD and H2-TPR characterization results showed that the reduced CoMgAl-x samples mainly consisted of solid solution and spinel phases with cobalt particles. The spinel phases contained Co3O4 and ConMg1-nAl2O4 (0 ≤ n ≤ 1) varying with the (Mg + Co)/Al ratio. The effect of (Mg + Co)/Al molar ratio on the catalytic behavior was investigated in detail and CoMgAl-3 exhibited the highest catalytic activity and stability among the catalysts studied.Co/Mg–Al oxide catalysts (CoMgAl-x, x = 1–5), particularly CoMgAl-3, prepared by the self-combustion method show high catalytic activity and stability in the methane dry reforming reaction.
Co-reporter:Li Zhang, Yuanhang Ren, Bin Yue and Heyong He
Chemical Communications 2012 vol. 48(Issue 18) pp:2370-2384
Publication Date(Web):03 Jan 2012
DOI:10.1039/C2CC16882K
In situ NMR studies of C1–C5 light alkane activation and functionalisation in heterogeneous catalytic systems are overviewed. The results obtained from the NMR technique, particularly those quantitative ones, provide unique information on the activation of alkane molecules and the nature of relevant intermediates, leading to better understanding reaction mechanisms and designing catalysts.
Co-reporter:Zuping Kong;Chunling Wang;Yuanhang Ren;Min Gu;Yichen Hu;Heyong He
Chinese Journal of Chemistry 2012 Volume 30( Issue 4) pp:759-764
Publication Date(Web):
DOI:10.1002/cjoc.201100439
Abstract
Two compounds, namely [Cd(HINA)2(µ2-H2O)(H2O)2]2[SiW12O40]·6H2O (1) and [Co(HINA)3(H2O)3][Co(HINA)2(H2O)4][SiW12O40]·2H2O (2), have been synthesized from the aqueous mixture containing H4SiW12O40, isonicotinic acid (HINA), and M(CH3COO)2 (M=Cd and Co). The compounds have been characterized by elemental analysis, IR spectroscopy, TG analysis, and single-crystal X-ray diffraction. The dinuclear coordinated cadmium units in compound 1 are linked to form 2D layer parallel to ab plane through π-π interactions and hydrogen bonds. Compound 2 contains two different types of coordinated metal cations, [Co(HINA)3(H2O)3]2+ and [Co(HINA)2(H2O)4]2+, which construct 2D layer along bc plane through π-π interactions and hydrogen bonds. In both compounds, the Keggin anions are located inside the channels and cavities formed from stack of the coordinated metal cations, which further achieve the 3D supramolecular structure through hydrogen bonds. The luminescent property of compounds 1 and 2 has been investigated.
Co-reporter:Yuanhang Ren, Chengbo Du, Sujiao Feng, Chunling Wang, Zuping Kong, Bin Yue and Heyong He
CrystEngComm 2011 vol. 13(Issue 23) pp:7143-7148
Publication Date(Web):21 Sep 2011
DOI:10.1039/C1CE06037F
Three polyoxometalates (POM)-based coordination polymers, [CuII2(C5H5NCOO)2(4-bpo)2(H2O)2]SiW12O40·H2O (1), [CuI4(4-bpo)6]SiW12O40·3H2O (2), and [CuI4(3-bpo)4]SiW12O40·3H2O (3), were hydrothermally synthesized from the mixture of H4SiW12O40, copper salts, and 3-bpo (2,5-bis(3-pyridyl)-1,3,4-oxadiazole) or 4-bpo (2,5-bis(4-pyridyl)-1,3,4-oxadiazole) and characterized by elemental analysis, IR spectroscopy, TG analysis, and single crystal X-ray diffraction. The 4-bpo molecules are connected into an infinite double-chain in compound 1 as a bidentate ligand. Compound 2 contains large hexagonal prism shaped molecular cages defined by copper ions and 4-bpo molecules which wrap Keggin ions inside. In compound 3 {Cu2(3-bpo)2} molecular rings connect with Keggin ions to form a 1D chain. By inspection of the structures, the geometry and the coordination mode of bpo ligands play important roles in the formation of 1–3. The catalytic performance of 1–3 was investigated for epoxidation of styrene using tert-butyl hydroperoxide (TBHP) as the oxidant. Compounds 1–3 present promising activity as heterogeneous catalysts while compound 1 exhibits the best yield of styrene epoxide.
Co-reporter:Chunling Wang, Yuanhang Ren, Chengbo Du, Bin Yue, Zuping Kong, Linhong Weng and Heyong He
CrystEngComm 2010 vol. 12(Issue 11) pp:3522-3525
Publication Date(Web):26 Jul 2010
DOI:10.1039/C004543H
A honeycomb nanoscale-porous material constructed from straight metal–organic chains and octahedral Lindqvist-type polyoxoanion building blocks is solvothermally synthesized, exhibiting a hexagonal array of one-dimensional pores similar with that of MCM-41. The pore sizes are in the range of 16.33 to 23.71 Å and the sorption property of the material is investigated.
Co-reporter:Lin Ye, Songhai Xie, Bin Yue, Linping Qian, Sujiao Feng, Shik Chi Tsang, Yingcheng Li and Heyong He
CrystEngComm 2010 vol. 12(Issue 2) pp:344-347
Publication Date(Web):25 Sep 2009
DOI:10.1039/B913268F
A well-ordered three-dimensional (3D) cubic Ia3d mesoporous niobium oxide with amorphous wall is prepared under controlled humidity by a sol-gel method and further converted to crystalline 3D niobium oxide with the retention of its original mesoporous system.
Co-reporter:Linping Qian; Dr. Bin Yue;Supeng Pei;Li Zhang;Lin Ye;Jifang Cheng;Shik Chi Tsang; Dr. Heyong He
Chinese Journal of Chemistry 2010 Volume 28( Issue 10) pp:1864-1870
Publication Date(Web):
DOI:10.1002/cjoc.201090311
Abstract
The effect of Rh dispersion on reforming of CH4 with CO2 over H-Beta supported Rh catalysts has been investigated. The CH4 and CO2 conversion over the catalysts increase with increasing Rh loading from 0.5 wt% to 4.0 wt% in the reaction temperature range of 823–1123 K. The high TOF of CH4 over 0.5 wt% and 1.0 wt% Rh/H-beta may be attributed to high dispersion of rhodium species. The catalysts before and after the reaction were characterized by XRD, TEM, and TG-DTA and the results indicate the catalysts with Rh loading of 0.5 wt% and 1.0 wt% exhibiting high resistance to coke. Under controllable conditions, we confirm that the coke is originated from methane dissociation and can be substantially oxidized by active oxygen species dissociated from the adsorbed carbon dioxide on the catalyst with high dispersion of Rh species.
Co-reporter:Chun Xia He, Bin Yue, Ji Fang Cheng, Wei Ming Hua, Ying Hong Yue, He Yong He
Chinese Chemical Letters 2009 Volume 20(Issue 7) pp:869-872
Publication Date(Web):July 2009
DOI:10.1016/j.cclet.2009.02.021
Mesoporous tetragonal sulfated zirconia with high surface area and narrow pore-size distribution was prepared using Zr(O-nPr)4 as zirconium precursor, sulfuric acid as sulfur source and triblock copolymer poly(ethylene glycol)–poly(propylene glycol)–poly(ethylene glycol) (P123) as the template. The samples were characterized by X-ray diffraction, N2 sorption, TEM, and NH3-TPD. A phase transformation from monoclinic sulfated zirconia to tetragonal sulfated zirconia is observed. The product shows strong acidity.
Co-reporter:Min Gu, Bin Yue, Renlie Bao, Heyong He
Materials Research Bulletin 2009 44(6) pp: 1422-1427
Publication Date(Web):
DOI:10.1016/j.materresbull.2008.11.018
Co-reporter:Jifang Cheng, Supeng Pei, Bin Yue, Linping Qian, Chunxia He, Yan Zhou, Heyong He
Microporous and Mesoporous Materials 2008 Volume 115(Issue 3) pp:383-388
Publication Date(Web):1 November 2008
DOI:10.1016/j.micromeso.2008.02.009
Hollow microspheres of ZSM-5 with a mesoporous shell have been synthesized through formation of amorphous hollow SiO2/Al2O3 microspheres by sol–gel process in multiple oil–water–oil emulsions and transformation of the amorphous species into zeolite by water–organic vapor-phase transport treatment at 160 °C for 8 days. The morphology of the amorphous and zeolite spheres observed by scanning electron microscopy shows no significant change whereas the molar ratio of Si/Al increases from 6 to 20 during the transformation. The structural feature of zeolite was characterized by X-ray diffraction and 29Si and 27Al magic-angle spinning nuclear magnetic resonance. Transmission electron microscopy and N2 adsorption–desorption isotherms indicate that uniform mesopores in the shell of zeolite spheres arise from the interstices among zeolite crystallites.
Co-reporter:Supeng Pei, Bin Zhang, Kun Jiao, Renlie Bao, Bin Yue, Heyong He
Acta Physico-Chimica Sinica 2008 Volume 24(Issue 4) pp:561-564
Publication Date(Web):April 2008
DOI:10.1016/S1872-1508(08)60022-4
Nanostructured cobalt molybdate catalysts supported on mesoporous silica SBA-15 with different loadings were prepared by citric acid coordination-impregnation method and characterized by XRD, TEM, and BET techniques. The characterization results showed that high loading of well-dispersed crystalline CoMoO4 may be achieved using citric acid coordination-impregnation method and the mesoporous structure of the support remained intact. The catalytic activity of these catalysts in the oxidative dehydrogenation of propane was investigated. The catalysts of nanostructured cobalt molybdate supported on mesoporous silica SBA-15 showed better catalytic performance than the corresponding bulk composite oxide and nanostructured CoMoO4 supported on SBA-15 with loading of 13% (mass fraction, w) displayed propene yield of 16.8% at 823 K.
Co-reporter:Yan Zhou;Ren-Lie Bao;Shi-Xi Liu;He-Yong He
Chinese Journal of Chemistry 2006 Volume 24(Issue 8) pp:
Publication Date(Web):9 AUG 2006
DOI:10.1002/cjoc.200690187
Keggin-type molybdovanadophosphoric acids (HPA), H4PMo11VO40 (1), H5PMo10V2O40 (2) and H6PMo9V3O40 (3) were anchored onto γ-aminopropyltriethoxysilane (APTS) aminosilylated silica mesoporous SBA-15 through acid-base neutralization and the resulting HPA/APTS/SBA-15 were characterized by BET, TEM, XRD, ICP, FTIR and 31P MAS NMR. The characterization results indicate that the Keggin-structure of these HPAs is preserved within the mesoporous silica host. The samples were tested for catalytic aerobic oxidation of acetaldehyde heterogeneously in liquid phase under ambient condition. The electrostatic force between heteropoly acid and amino groups grafted on the silica channel surface leads to strong immobilization of HPA inside SBA-15 which is against the leaching during the reaction. The good catalytic performance and easy recycle of these catalysts make them as potential environmental friendly catalysts for elimination of indoor air pollutants.
Co-reporter:Shixi Liu, Bin Yue, Kun Jiao, Yan Zhou, Heyong He
Materials Letters 2006 Volume 60(Issue 2) pp:154-158
Publication Date(Web):January 2006
DOI:10.1016/j.matlet.2005.08.008
Zinc and iron nitrates with molar ratio of 1 : 2 were introduced into mesoporous silica host SBA-15 via a “two-solvent” route. The thermal decomposition of the precursors inside SBA-15 and the formation of spinel phase were monitored by X-ray diffraction, thermogravimetric and differential thermal analysis. The one-dimensional nanostructured spinel zinc ferrite in mesopores and pure spinel ZnFe2O4 nanowires, obtained through complete removal of the silica template with aqueous NaOH solution, were confirmed by TEM. The nanowires exhibited superparamagnetism at room temperature, whereas the bulk spinel ZnFe2O4 showed weak paramagnetism.
Co-reporter:Bin Yue, Huili Tang, Zuping Kong, Kake Zhu, Calum Dickinson, Wuzong Zhou, Heyong He
Chemical Physics Letters 2005 Volume 407(1–3) pp:83-86
Publication Date(Web):17 May 2005
DOI:10.1016/j.cplett.2005.03.066
Abstract
Three-dimensional (3D) mesoporous tungsten oxide single crystals has been prepared by using aminosilylized 3D mesoporous SBA-15 as the template and characterized by X-ray diffraction, transmission electron microscopy, and selected area electron diffraction. The product is an array of hexagonally ordered nanorods linked by nanosized bridges to form a 3D open framework as an inverse replica of SBA-15.
Co-reporter:Bin Yue;De-Jun Tan;Shi-Run Yan;Yan Zhou;Ka-Ke Zhu;Jian-Feng Pan;Ji-Hua Zhuang;He-Yong He
Chinese Journal of Chemistry 2005 Volume 23(Issue 1) pp:32-36
Publication Date(Web):26 JAN 2005
DOI:10.1002/cjoc.200590008
A new approach was developed to fabricate nanowires of mixed oxides MoO3-V2O5 inside the channels of mesoporous silica SBA-15. The method involves functionalization of the channel surface of SBA-15 with aminosilane groups, immobilization of Keggin-type molybdovanadophosphoric acids through an acid-base interaction, and heat treatment. The immobilization of the heteropolyacid containing mixed addenda makes the molar ratio of the loaded components controllable. The formation of the MoO3-V2O5 nanowires inside the channels was monitored by variable temperature in situ XRD. The materials obtained by heat treatment at 400 °C for 5 h were characterized by TEM, N2-sorption measurements, laser Raman spectra and UV-Vis diffuse reflectance spectra. Further heat treatment of the MoO3-V2O5 nanowires inside the SBA-15 channels at higher temperature (700 °C) destroys the framework integrity of SBA-15 by complete sublimation of MoO3 through the SBA-15 channel walls.
Co-reporter:Kake Zhu, Heyong He, Songhai Xie, Xuan Zhang, Wuzong Zhou, Songlin Jin, Bin Yue
Chemical Physics Letters 2003 Volume 377(3–4) pp:317-321
Publication Date(Web):15 August 2003
DOI:10.1016/S0009-2614(03)01206-5
Abstract
A new method is developed to obtain crystalline nanowires of WO3 using mesoporous silica SBA-15 as template. The method includes aminosilylation of the surface silanols within SBA-15 channels, anchoring of the heteropoly acid (HPA) to the grafted amine groups, thermal decomposition of the HPA, and removal of the silica framework with HF. The formation of the crystalline nanowires is monitored by the in situ XRD technique. TEM images intuitively confirm that the nanowires are uniform in diameter and HRTEM images further indicate that each nanowire belongs to single crystal although the growth orientations of these nanowires are different.
Co-reporter:Min Gu, Meiyin Wang, Zhewei Weng, Yuanhang Ren, Bin Yue
Polyhedron (8 May 2017) Volume 127() pp:
Publication Date(Web):8 May 2017
DOI:10.1016/j.poly.2017.01.045
Four novel polyoxometalates (POMs) based inorganic–organic hybrid compounds, [(SiMo12O40)Cu4(3-bpo)4]·2H2O (1), [(SiMo12O40)Cu2(3-bpo)2(NA)2]·2H2O (2), [(H2P2W18O62)Cu2(3-bpo)4(H2O)2]·2H2O (3), and [(H2P2W18O62)Co2(3-bpo)4(H2O)2]·9H2O (4) (NA = nicotinic acid, C5H4NCOOH; 3-bpo = 2,5-bis(3-pyridyl)-1,3,4-oxadiazole, C12H8N4O) have been synthesized under hydrothermal condition. Single crystal X-ray diffraction study reveals that all compounds contain the same basic binuclear {M2(3-bpo)2} (M = Co, Cu) moieties as building blocks. In compound 1, the [Cu2(3-bpo)2]2+ unit formed from the CuI ions and the 3-bpo molecules connect with tetradentate [SiMo12O40]4− polyanions to form 1D chains which further link each other to construct 2D layer structure. In compound 2, the [Cu2(3-bpo)2]4+ units are modified by two monodentate nicotinic acid molecules to form a [Cu2(3-bpo)2(NA)2]4+ moiety. The [Cu2(3-bpo)2(NA)2]4+ moiety is linked by tetradentate [SiMo12O40]4− polyanions to construct 1D linear chains and the adjacent 1D chains stack into the 3D structure through π–π interactions. In compounds 3 and 4, the binuclear {M2(3-bpo)2} units are further coordinated by two monodentate 3-bpo molecules and two water molecules to form [M2(3-bpo)4(H2O)2]4+ (M = Co, Cu) moieties which are further linked by tetradentate {P2W18} polyanions to construct 1D wave-like chains. The influences of POMs type and pH value on the formation of the four compounds have been discussed. Furthermore, the electrochemical performances of the compounds 1–4 have been investigated by cyclic voltammetry.Four novel POMs-based compounds with the same binuclear [M2(3-bpo)2] (M = Co, Cu) unit were hydrothermally synthesized by introducing different POMs and modulating the pH value. Their structures and electrochemical behaviors were also studied.
Co-reporter:Liya Hu, Bin Yue, Cheng Wang, Xueying Chen, Heyong He
Applied Catalysis A: General (5 May 2014) Volume 477() pp:141-146
Publication Date(Web):5 May 2014
DOI:10.1016/j.apcata.2014.03.019
Co-reporter:Linping Qian, Yu Ren, Hui Yu, Yu Wang, Bin Yue, Heyong He
Applied Catalysis A: General (15 July 2011) Volume 401(Issues 1–2) pp:114-118
Publication Date(Web):15 July 2011
DOI:10.1016/j.apcata.2011.05.004
Co-reporter:Supeng Pei, Bin Yue, Linping Qian, Shirun Yan, Jifang Cheng, Yan Zhou, Songhai Xie, Heyong He
Applied Catalysis A: General (1 October 2007) Volume 329() pp:148-155
Publication Date(Web):1 October 2007
DOI:10.1016/j.apcata.2007.07.008
Co-reporter:Yichen Hu, Bin Guo, Yingyi Fu, Yuanhang Ren, Gangfeng Tang, Xueying Chen, Bin Yue and Heyong He
Chemical Communications 2015 - vol. 51(Issue 75) pp:NaN14222-14222
Publication Date(Web):2015/08/10
DOI:10.1039/C5CC04548G
Sulfated titania solid superacids with dominant {001}, {001}/{101}, and {101} facets were prepared by the hydrothermal method and subsequent sulfation. Their facet-dependent acidic properties were investigated by the solid-state 31P NMR technique and Pechmann condensation of 5,7-dihydroxy-4-methyl coumarin.
Co-reporter:Li Zhang, Yuanhang Ren, Bin Yue and Heyong He
Chemical Communications 2012 - vol. 48(Issue 18) pp:NaN2384-2384
Publication Date(Web):2012/01/03
DOI:10.1039/C2CC16882K
In situ NMR studies of C1–C5 light alkane activation and functionalisation in heterogeneous catalytic systems are overviewed. The results obtained from the NMR technique, particularly those quantitative ones, provide unique information on the activation of alkane molecules and the nature of relevant intermediates, leading to better understanding reaction mechanisms and designing catalysts.
Co-reporter:Li Zhang, Bin Yue, Yuanhang Ren, Xueying Chen and Heyong He
Catalysis Science & Technology (2011-Present) 2013 - vol. 3(Issue 8) pp:NaN2118-2118
Publication Date(Web):2013/05/02
DOI:10.1039/C3CY00121K
Aluminum doped cesium salts of tungstophosphoric acid, AlxCs2.5–3xH0.5PW12O40 (x = 0.05, 0.1 and 0.15), were prepared via a solid state synthesis method and their catalytic activity in n-butane isomerization reaction was tested using the 13C MAS NMR technique and 1-13C-n-butane as the reactant. All AlxCs2.5–3xH0.5PW12O40 catalysts show higher catalytic activity than Cs2.5H0.5PW12O40. Among them, Al0.1Cs2.2H0.5PW12O40 exhibits the best performance. The MAS NMR technique was further employed to characterize the acidity of the catalysts using trimethylphosphine and 2-13C-acetone as the basic probe molecules. Al0.1Cs2.2H0.5PW12O40 possesses higher Brönsted acid strength than Cs2.5H0.5PW12O40, which parallels the activity of the catalysts. For a catalyst used in n-butane isomerization reaction, to enhance its Brönsted acid strength rather than to increase its acid density is more important for improving the activity of the catalyst.
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