Co-reporter:Boliang Liu, Pingping Jiang, Pingbo Zhang, Gang Bian, Mengtian Li
Catalysis Communications 2017 Volume 99(Volume 99) pp:
Publication Date(Web):1 August 2017
DOI:10.1016/j.catcom.2017.05.020
•New Fe-doped solid acids were prepared by co-precipitation method and characterized.•Fe-doped catalysts exhibited excellent activities in caprylic acid esterification.•The highest caprylic acid conversion of 92.4% obtained within 4 h.•Doping of Fe can also greatly upgrade the stability and reusability of SO42 −/AlPO4.A series of SO42 −/FexAl1 − xPO4 solid acid catalysts were prepared and characterized by means of XRD, FE-SEM, elemental analysis, N2 adsorption–desorption, XPS, NH3-TPD, pyridine adsorption FT-IR and ion exchange/titration. Their catalytic performances were evaluated by the esterification of caprylic acid with ethanol. Experimental results revealed that the doping of iron can markedly enhance the acidic properties of the SO42 −/AlPO4, thereby boosting its catalytic activity in esterification. The maximum caprylic acid conversion of 92.4% was achieved over the iron doped catalysts. Moreover, the incorporation of iron has also greatly elevated the stability of SO42 −/AlPO4 during repeated catalytic cycles.
Co-reporter:Boliang Liu, Pingping Jiang, Pingbo Zhang, Hui Zhao, Jie Huang
Comptes Rendus Chimie 2017 Volume 20, Issue 5(Volume 20, Issue 5) pp:
Publication Date(Web):1 May 2017
DOI:10.1016/j.crci.2016.07.006
Novel solid acid catalysts synthesized from aluminum phosphate were prepared via a precipitation method and a subsequent sulfating treatment. Their catalytic performances for the esterification of propanoic acid with n-butanol were investigated. The as-prepared catalysts were characterized by means of X-ray diffraction (XRD), scanning electron microscopy (SEM), nitrogen adsorption–desorption, Fourier transform infrared spectroscopy (FT-IR), X-ray photoelectron spectroscopy (XPS), temperature programmed desorption of ammonia (NH3-TPD), infrared spectroscopy of adsorbed pyridine, and other techniques. Experimental results of esterification reactions indicated that the calcination temperature can significantly affect the catalytic performances and the catalyst calcined at 500 °C (SO42−/AlPO4-500) exhibited the highest activity. The effects of different reaction conditions including reaction time, reaction temperature, catalyst amount and alcohol/acid molar ratio were studied in detail. The maximum propanoic acid conversion of 91% was achieved under optimum reaction conditions. Furthermore, the as-prepared SO42−/AlPO4-500 catalysts were tested for their reusability in repeated reaction cycles and could be effectively regenerated by a simple reactivation method.
Co-reporter:Jie Huang;Yue Wen;Agus Haryono
Polymer Bulletin 2017 Volume 74( Issue 7) pp:2767-2785
Publication Date(Web):28 November 2016
DOI:10.1007/s00289-016-1838-5
Hybrid polyurethanes with double-decker silsesquioxane (DDSQ) in the main chains were synthesized using castor oil and isophorone diisocyanate (IPDI) as feedstock. Double-decker octaphenylsilsesquioxanetetraol (DDSQ) was prepared and characterized by 1H NMR and MALDI-TOF–MS. Meanwhile, FTIR, TGA, DSC, SEM, UV–Vis spectrophotometer, tensile test techniques and static contact angle were also carried out to investigate the structures and properties of the hybrid polyurethanes. The DDSQ-containing hybrid polyurethanes exhibited improved thermal stability in terms of thermogravimetric analysis (TGA). DSC analysis demonstrated that the hybrid polyurethanes with DDSQ displayed enhanced glass transition temperature. According to the results of SEM and UV–Vis spectrophotometer, the aggregates of DDSQ were dispersed homogeneously in the hybrid polyurethanes matrix. With the inclusion of DDSQ, the hydrophobicity of the hybrid material was significantly improved as the results of the static contact angles revealed.
Co-reporter:Tao Liu, Pingping Jiang, Hongliang Liu, Mengtian Li, Yuming Dong, Ranming Wang, Yunjie Wang
Polymer Testing 2017 Volume 61(Volume 61) pp:
Publication Date(Web):1 August 2017
DOI:10.1016/j.polymertesting.2017.05.012
In order to develop alternative green plasticizers, a bio-based plasticizer, acetylated lactic acid 1,4-cyclohexanedimethyl ester(ALCH), with novel molecule geometry was synthesized from l-lactic acid and characterized by FTIR, 1H NMR and matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS). The prepared ALCH was mixed with poly(vinyl chloride) (PVC) as plasticizer and the results indicated that the PVC films plasticized by ALCH have better migration and volatility stability than acetyl tributyl citrate (ATBC). In addition, ALCH could endow PVC products with excellent performance of strength, elongation and elasticity. With the substitution of ALCH for ATBC, glass transition temperature (Tg) of PVC films decreased gradually from 61.3°C to 55.0 °C. The self-polymerization of lactic acid gives ALCH better plasticizing effectiveness than ATBC.
Co-reporter:Ling Hu;Gang Bian;Min Huang;Agus Haryono;Pingbo Zhang;Yanmin Bao;Jialiang Xia
Journal of Applied Polymer Science 2017 Volume 134(Issue 6) pp:
Publication Date(Web):2017/02/10
DOI:10.1002/app.44440
ABSTRACTA novel graphene nanomaterial functionalized by octa(aminopropyl) polyhedral oligomeric silsesquioxane (OapPOSS) was synthesized and then confirmed by Fourier transform infrared spectroscopy, thermogravimetric analysis (TGA), Raman spectroscopy, X-ray photoelectron spectroscopy, transmission electron microscopy, scanning electron microscopy with energy-dispersive X-ray spectroscopy (SEM EDX), atomic force microscopy, and X-ray diffraction. The obtained functionalized graphene (OapPOSS-GO) was used to reinforce waterborne polyurethane (WPU) to obtain OapPOSS-GO/WPU nanocomposites by in situ polymerization. The thermal, mechanical, and hydrophobic properties of nanocomposites as well as the dispersion behavior of OapPOSS-GO in the polymer were investigated by TGA, a tensile testing machine, water contact angle tests, and field emission SEM, respectively. Compared with GO/WPU and OapPOSS/WPU composites, the strong interfacial interaction between OapPOSS-GO and the WPU matrix facilitates a much better dispersion and load transfer from the WPU matrix to the OapPOSS-GO. It was found that the tensile strength of the OapPOSS-GO/WPU composite film with 0.20 wt % OapPOSS-GO exhibited a 2.5-fold increase in tensile strength, compared with neat WPU. Better thermal stability and hydrophobicity of nanocomposites were also achieved by the addition of OapPOSS-GO. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2017, 134, 44440.
Co-reporter:Weijie Zhang, Ying Wang, Yan Leng, Pingbo Zhang, Jian Zhang and Pingping Jiang
Catalysis Science & Technology 2016 vol. 6(Issue 15) pp:5848-5855
Publication Date(Web):20 Apr 2016
DOI:10.1039/C6CY00538A
In efforts to replicate the 3D model and desirable function of haemoglobin, the zeolite imidazolate framework (ZIF-8) was delineated for an ideal host matrix to accommodate custom-designed porphyrin molecules via hydrogen bonding, thus providing a suitable micro-environment similar to the protein skeleton around the active sites in haemoglobin. The spectral investigations including X-ray photoelectron spectroscopy (XPS) tests and Raman spectra, together with the experimental details and computational simulations, showed that it is a weak hydrogen bond that drives guests into the cage of ZIF-8. At the atomic level, the amino substituent on Mn-TAPP coupled with the C–H on the 2-methylimidazolate (MeIM) constitutes the host–guest interaction (Por-N⋯H-MeIM). In particular, this novel heterogeneous catalyst, denoted as Mn-TAPP@ZIF-8, shows an enhanced catalytic efficiency (up to 7600 ton) compared to the homogeneous complexes and other reported studies, strongly supporting the synergistic interplay raised from the hydrogen bond.
Co-reporter:Weijie Zhang, Wenyang Gao, Tony Pham, Pingping Jiang, and Shengqian Ma
Crystal Growth & Design 2016 Volume 16(Issue 2) pp:1005-1009
Publication Date(Web):January 4, 2016
DOI:10.1021/acs.cgd.5b01548
Herein we report the construction of a robust metal-metalloporphyrin framework that is based upon a rare secondary building unit of infinite nickel oxide chain. The constructed MMPF-20 exhibits permanent porosity and selective adsorption of CO2 over CH4 as well as demonstrates interesting catalytic performances in the context of olefin epoxidation.
Co-reporter:Jian Zhang;Yirui Shen;Weijie Zhang
Journal of Porous Materials 2016 Volume 23( Issue 2) pp:431-440
Publication Date(Web):2016 April
DOI:10.1007/s10934-015-0097-4
Molybdenum(VI) Schiff base complexes modified mesoporous SBA-15 hybrid heterogeneous catalysts were synthesized by the reaction of MoO2(acac)2 with mesoporous SBA-15 functionalized by grafting procedures of 3-aminopropyl-triethoxysilane and salicylaldehyde, respectively. The physico-chemical properties of the as-synthesized catalysts were analyzed by ICP-AES, XRD, N2 adsorption–desorption, FT-IR, SEM, TEM and EDX. The as-synthesized catalysts were effective in the catalytic epoxidation of cyclohexene. The catalytic activity can be further enhanced by silylation of the residual Si–OH groups using Me3SiCl, which was largely due to the higher content of Mo active sites. The conversion and selectivity reached to 97.78 and 93.99 % using tert-butyl hydroperoxide as oxidant for Mo–CH3–SA–NH2–SBA-15, while 81.97 and 89.41 % in conversion and selectivity for Mo–SA–NH2–SBA-15. At the same time, the catalytic performances of the hybrid materials were further systematically investigated under various reaction conditions (solvent, oxidants and alkenes, etc.). Mo–CH3–SA–NH2–SBA-15 catalyst can be recycled effectively and reused four cycles with little loss in activity. In addition, the results from hot filtration demonstrated that the catalytic activity mostly resulted from the heterogeneous catalytic process.
Co-reporter:Weijie Zhang;Lukasz Wojtas;Briana Aguila; Pingping Jiang; Shengqian Ma
ChemPlusChem 2016 Volume 81( Issue 8) pp:714-717
Publication Date(Web):
DOI:10.1002/cplu.201600158
Abstract
The rational design of multitopic organic linkers and access to the single-crystal structures of their metal–organic frameworks violate a long-standing thesis where it is expected to steer the system toward multifunctional MOFs. Here, a porphyrin that is covalently functionalized with pendant tert-butyl groups is used as a ligand having conformational freedom. The utilization of this custom-designed porphyrinic derivative in MOF synthesis yields a novel metal–metalloporphyrin framework (MMPF-14). As expected, the channels of MMPF-14, which are filled with flexible tert-butyl groups, act as molecular gates for the selective adsorption of gas molecules.
Co-reporter:Ling Hu;Pingbo Zhang;Gang Bian
Journal of Materials Science 2016 Volume 51( Issue 18) pp:8296-8309
Publication Date(Web):2016 September
DOI:10.1007/s10853-016-9993-5
To study the dispersity of different amine-graphene oxide (amine-GO) in polymer matrix and the interfacial interactions between functionalized graphene oxide and matrix, two kinds of modifiers—organoamine- and aminosilane-coupling agents—were used to functionalize graphene nanosheets to obtain functionalized graphene oxide/waterborne polyurethane nanocomposites by in situ polymerization. The chemical structure, morphology, and interlayer space of amine-GO nanoplatelets were confirmed by FT-IR, Raman, TGA, XPS, TEM, AFM, and XRD. The dispersity behaviors between different amine-GOs and polymers were evaluated by FESEM. The thermal, mechanical, and hydrophobic properties of the nanocomposites were investigated by TGA, tensile testing machine, and water contact angle test, respectively. It was found that the tensile strength of nanocomposites was increased from 10.13 to 27.79 and 28.96 Mpa after the addition of amine-GO functionalized by APTMS and APTES, respectively. The better thermal stability and hydrophobicity of nanocomposites were also achieved by the addition of amine-GO, especially those modified by aminosilane-coupling agents. This study paves a new route for designing and developing chemically converted graphene oxide nanosheets/polymer nanocomposite materials by altering suitable amine-modifier to functionalize graphene oxide nanosheets and then optimizing the interphases between graphene oxide nanosheets and polymer matrices.
Co-reporter:Hui Zhao, Yuming Dong, Pingping Jiang, Hongyan Miao, Guangli Wang and Jingjing Zhang
Journal of Materials Chemistry A 2015 vol. 3(Issue 14) pp:7375-7381
Publication Date(Web):17 Feb 2015
DOI:10.1039/C5TA00402K
MoS2-decorated graphitic C3N4 (g-C3N4/MoS2) photocatalysts were prepared by a simple and scalable in situ light-assisted method. In this process, MoS2 was formed from the reduction of [MoS4]2− by photogenerated electrons, and was then loaded in situ on the electron outlet points of g-C3N4. The g-C3N4/MoS2 composite was well characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (Raman), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), and ultraviolet visible diffuse reflection spectroscopy (UV-DRS). The g-C3N4/MoS2 photocatalysts showed good photocatalytic H2 evolution activity. When the loading amount of MoS2 was increased to 2.89 wt% (g-C3N4/MoS2-2.89%), the highest H2 evolution rate (252 μmol g−1 h−1) was obtained. In addition, g-C3N4/MoS2-2.89% presented stable photocatalytic H2 evolution ability (no noticeable degradation of photocatalytic H2 evolution was detected in 18 h) and good natural light driven H2 evolution ability (the H2 evolution rate was 320 μmol g−1 h−1). A possible photocatalytic mechanism of the MoS2 cocatalyst for the improvement of the photocatalytic activity of g-C3N4 is proposed, where MoS2 can efficiently promote the separation of the photogenerated electrons and holes of g-C3N4, consequently enhancing the H2 evolution activity; this mechanism is supported by the photoluminescence spectroscopy and photoelectrochemical analyses.
Co-reporter:Hui Zhao, Yuming Dong, Pingping Jiang, Guangli Wang, and Jingjing Zhang
ACS Applied Materials & Interfaces 2015 Volume 7(Issue 12) pp:6451
Publication Date(Web):March 16, 2015
DOI:10.1021/acsami.5b00023
In this report, a novel nanocomposite of highly dispersed CeO2 on a TiO2 nanotube was designed and proposed as a peroxidase-like mimic. The best peroxidase-like activity was obtained for the CeO2/nanotube-TiO2 when the molar ratio of Ce/Ti was 0.1, which was much higher than that for CeO2/nanowire-TiO2, CeO2/nanorod-TiO2, or CeO2/nanoparticle-TiO2 with a similar molar ratio of Ce/Ti. Moreover, in comparison with other nanomaterial based peroxidase mimics, CeO2/nanotube-TiO2 nanocomposites exhibited higher affinity to H2O2 and 3,3′,5,5′-tetramethylbenzidine (TMB). Kinetic analysis indicated that the catalytic behavior was in accordance with typical Michaelis–Menten kinetics. Ce3+ sites were confirmed as the catalytic active sites for the catalytic reaction. The first interaction of surface CeO2 with H2O2 chemically changed the surface state of CeO2 by transforming Ce3+ sites into surface peroxide species causing adsorbed TMB oxidation. Compared with CeO2/nanowire-TiO2, CeO2/nanorod-TiO2, and CeO2/nanoparticle-TiO2, the combination of TiO2 nanotube with CeO2 presented the highest concentration of Ce3+ thus leading to the best peroxidase-like activity. On the basis of the high activity of CeO2/nanotube-TiO2, the reaction provides a simple method for colorimetric detection of H2O2 and glucose with the detection limits of 3.2 and 6.1 μM, respectively.Keywords: CeO2/TiO2 nanocomposite; glucose; H2O2; peroxidase mimic; synergistic effect
Co-reporter:Hui Zhao, Yuming Dong, Pingping Jiang, Guangli Wang, Hongyan Miao, Ruixian Wu, Linggang Kong, Jingjing Zhang, and Chi Zhang
ACS Sustainable Chemistry & Engineering 2015 Volume 3(Issue 5) pp:969
Publication Date(Web):April 7, 2015
DOI:10.1021/acssuschemeng.5b00102
In our work, ZnO/CdS hybrid photocatalysts were prepared by a simple and reproducible photodeposition method and the content of deposited CdS can be varied by irradiation time. The ZnO/CdS photocatalysts showed good photocatalytic H2 evolution activities in aqueous Na2S + Na2SO3 solution. When the content of CdS loading increased to 22.91% after an irradiation time of 120 min (ZnO/CdS-T120), the highest photocatalytic activity was obtained (1725 μmol g–1 h–1), which was about 9.2 and 34.5 times than that of single ZnO and CdS photocatalysts. At the same time, ZnO/CdS-T120 presented stable photocatalytic ability (no noticeable degradation of H2 evolution in four repeated runs in 48 h). Compared with other reported H2 evolution photocatalysts, ZnO/CdS-T120 showed higher H2 evolution activity and stability. Additionally, ZnO/CdS-T120 has a good natural sunlight driven H2 evolution ability (2077 μmol g–1 h–1). ZnS was proved to generate on ZnO/CdS-T120 surface in process of photocatalytic H2 evolution based on structural analyses of recycle ZnO/CdS-T120. The formation of ZnS enhanced the photocatalytic H2 evolution activity of ZnO/CdS and extended the visible light adsorption region. Meanwhile, the generation of ZnS increased the transfer interfaces for photogenerated charge carriers and consequently promoted the separation of photogenerated electrons and holes.Keywords: Hydrogen generation; Photocatalyst; Photodeposition; Water splitting; ZnO/CdS heterostructure;
Co-reporter:Weijie Zhang, Pingping Jiang, Ying Wang, Jian Zhang and Pingbo Zhang
Catalysis Science & Technology 2015 vol. 5(Issue 1) pp:101-104
Publication Date(Web):02 Sep 2014
DOI:10.1039/C4CY00969J
Two kinds of novel functional covalent organic frameworks were assembled with the porphyrin building block and terephthalaldehyde or squaric acid via bottom-up approach. Here, our reported covalent porphyrinic frameworks with coordinated manganese(III) ions (Mn–CPF-1 and Mn–CPF-2) present promising catalytic properties for the selective oxidation of olefins.
Co-reporter:Gang Bian, Pingping Jiang, Weijie Zhang, Kelei Jiang, Ling Hu, Zhang Jian, Yirui Shen and Pingbo Zhang
RSC Advances 2015 vol. 5(Issue 110) pp:90757-90765
Publication Date(Web):26 Oct 2015
DOI:10.1039/C5RA14813H
Considering the issue of low yield in the synthesis of benzoate esters and fatty acid alkyl esters, designing a high catalytic activity composite catalyst is very significant and attractive. In this study, the rational design strategy was used to develop a novel poly(p-styrenesulfonate acid, namely PSSF) grafted multi-walled carbon nanotube composite with graphene oxide nanomaterial (PSSF-mCNTs-GO) using a simple two-step method. FT-IR and Raman spectroscopy, XRD, SEM, TEM, and NH3-TPD were used to characterize the inorganic–organic hybrid material. In particular, the addition of GO remarkably enhanced its catalytic performance in the production of fatty acid alkyl esters (92.16%) and benzoate esters (90.27%), in which the conversion was more than doubled as a result of its strong π–π interaction with the substrate. In addition, PSSF-mCNTs-GO can be separated from the substrate conveniently and still maintained a relatively high catalytic activity even after 6 times recycling, which indicates its rather good reusability. This novel catalyst is promising in the synthesis of biodiesel and benzoate esters.
Co-reporter:Hui Zhao, Yuming Dong, Pingping Jiang, Xiuming Wu, Ruixian Wu and Yanmei Chen
RSC Advances 2015 vol. 5(Issue 9) pp:6494-6500
Publication Date(Web):17 Dec 2014
DOI:10.1039/C4RA13203C
A ZnS/ZnO nanocomposite was facilely and cost-effectively prepared for visible light photocatalytic H2 evolution. ZnS/ZnO showed good H2 evolution activity (187 μmol g−1 h−1) and stability (nearly linear H2 production rate even after 16 h) without any co-catalyst. Furthermore, ZnS/ZnO revealed superior catalytic performance in sunlight-driven H2 evolution (1807 μmol g−1 h−1). Due to the electronic hybridization of ZnO band structures with ZnS-surface-states, the band bending and surface dipole moment of ZnO could occur. Under visible-light irradiation, the electrons at the ZnO/ZnS interfaces can be excited from the bent valence band level to the conduction bend of ZnO for water reduction, while the holes trapped by ZnS-surface-states can be quenched by the sacrificial reagent (S2−/SO32−). The created ZnS/ZnO interfaces with ZnS-surface-states led to a lower band gap energy and enabled the visible light response.
Co-reporter:Jian Zhang, Pingping Jiang, Yirui Shen, Weijie Zhang, Xiaoting Li
Microporous and Mesoporous Materials 2015 Volume 206() pp:161-169
Publication Date(Web):April 2015
DOI:10.1016/j.micromeso.2014.12.027
•Two molybdenum complexes with tridentate Schiff base ligand were prepared for the first time.•Two molybdenum complexes with tridentate Schiff base ligand were applied in catalytic epoxidation of alkenes.•Surface silylation of catalyst led to the enhanced catalytic performance.•Mo-FSAP-CH3-Cl-SBA-15 showed the excellent catalytic activity and reusability.Two novel molybdenum(VI) tridentate Schiff base complexes supported onto modified mesoporous SBA-15 were prepared by a covalent grafting method, one of which involved the postsynthesis trimethylsilylation of Mo-FSAP-Cl-SBA-15 to remove the residual surface silanol groups. The prepared complex materials were characterized by FT-IR, XRD, SEM, TEM, 29Si CP–MAS-NMR, TGA, ICP-AES and nitrogen adsorption–desorption. Both two were active in the catalytic epoxidation of cyclohexene at 80 °C using tert-butylhydroperoxide (TBHP) as oxidant and 1,2-dichloroethane as solvent. The catalytic activity of the heterogenized organo catalyst can be further enhanced by silylation of the residual Si–OH groups using Me3SiCl, due to the higher content of Mo active sites and better surface hydrophobicity. As a result, using the more efficient catalyst Mo-FSAP-CH3-Cl-SBA-15 for catalytic reaction, the conversion and selectivity were 94.38% and 91.63%, respectively, under the optimized condition. After being used five times, the conversion and selectivity of Mo-FSAP-CH3-Cl-SBA-15 were still above 80.00% and 90.00% indicating the good reusability of Mo-FSAP-CH3-Cl-SBA-15.
Co-reporter:Yingpei Sheng;Duyang Zhang ;Jingyu Hua
Journal of Applied Polymer Science 2015 Volume 132( Issue 2) pp:
Publication Date(Web):
DOI:10.1002/app.41277
ABSTRACT
In this article, a series of sustainable polyurethanes are prepared by introducing different content of cyclic polysilanol, which may act as a chain extender to replace 1, 4-butanediol (BDO). Consequently, cyclic polysiloxanes are successfully incorporated into the molecular chains to afford organic–inorganic polyurethanes and then their effects on polyurethanes thermal properties and surface hydrophilicity are fully characterized by thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), and contact angle testing. Results show that the hybrid polyurethanes display enhanced glass transition temperatures (Tg). While in terms of TGA, the effects of cyclic polysilanol on thermal properties seem complex, which would reduce the thermal stability in the first degradation process but enhance in the second process. The morphology observed by scanning electron microscopy (SEM) show that the inorganic constitutions, namely, cyclic polysilanol, may occur to self-condensation or aggregation, which can help to explain the uncommon thermal phenomenon above. Thus, an opportunity of future applicability in the areas of sustainable polymer with improved properties can be envisioned in our research method of hybrid polyurethanes. © 2014 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2015, 132, 41277.
Co-reporter:Weijie Zhang;Ying Wang;Jian Zhang;Pingbo Zhang
Catalysis Letters 2015 Volume 145( Issue 2) pp:589-595
Publication Date(Web):2015 February
DOI:10.1007/s10562-014-1433-z
An efficient metal–organic framework catalyst was developed with manganese tetrakis(4-carboxyphenyl)porphyrin as either bridging moiety or catalytically active sites under a hydrothermal condition. Surprisingly, the X-ray diffraction details showed that this porous network, MMPF (MMPF denotes iron-connected metal metalloporphyrinic framework) was successfully constructed with a physically flexible framework and resistance to basic solution. Accordingly, catalytic studies have demonstrated that MMPF can catalyze the selective oxidation of a variety of substrates with PhIO as oxidant in acetonitrile solution under mild temperature. More importantly, the MMPF outperformed the homogeneous Mn-TPP in catalyzing epoxidation of cyclohexene, mainly due to its high efficiency of 3D network-based nanochannel-reactor in MMPF. This gave rise to a structural resistance to formation of catalytically inactive species.
Co-reporter:Hui Zhao, Yuming Dong, Pingping Jiang, Guangli Wang, Jingjing Zhang and Kun Li
Catalysis Science & Technology 2014 vol. 4(Issue 2) pp:494-501
Publication Date(Web):04 Nov 2013
DOI:10.1039/C3CY00674C
In this paper, the kinetics and interface sensitivity of nano-sized magnetic NiFe2O4 in incomplete catalytic ozonation were investigated in detail. By analyzing the kinetics of heterogeneous reactions, it was found that both the degradation of phenol and the decomposition of molecular ozone appeared to follow a first order kinetics model and the presence of nano-NiFe2O4 significantly enhanced these processes. The kinetics equations and reaction rate constants were determined according to experimental results. In light of the IR spectra, the Lewis acid sites were further confirmed as reactive centers for catalytic ozonation in the aqueous phase, and the reason for deactivation of the NiFe2O4 nanocatalyst during incomplete ozonation of organic compounds was determined. The catalytic activity of the NiFe2O4 nanocatalyst could be completely recovered by calcination and ozonation methods, which makes it an attractive nanomaterial with prospective applications in water treatment. According to the interface sensitivity of ozone in water, a strong interaction between ozone and NiFe2O4 was observed and the role of water was revisited. Water molecules were clarified as two different types: one is chemisorbed water on the catalyst surface and the other is bulk water in aqueous solution. Both bulk and chemisorbed water molecules should be weak competitors compared with ozone, and the chemisorbed water on the catalyst surface was proposed not as an inhibitor but an accelerator for catalytic activity.
Co-reporter:Hui Zhao, Pingping Jiang, Yuming Dong, Min Huang and Boliang Liu
New Journal of Chemistry 2014 vol. 38(Issue 9) pp:4541-4548
Publication Date(Web):05 Jun 2014
DOI:10.1039/C4NJ00494A
In this paper, a high-surface-area mesoporous sulfated nano-titania exposed with (101) facets was prepared by a simple hydrothermal method without any template followed by surface sulfate modification. The physicochemical properties of the as-prepared catalyst were well characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high resolution transmission electron microscopy (HRTEM), scanning electron microscopy (SEM), Raman spectroscopy (Raman), Fourier transform infrared spectroscopy (FTIR), N2 adsorption–desorption isotherms, temperature programmed desorption of NH3 (NH3-TPD), X-ray photoelectron spectroscopy (XPS) and pyridine adsorption infrared spectroscopy. The BET surface area of sulfated nano-titania with exposed (101) facets was 121 m2 g−1. Well dispersed bidentate sulfate groups were linked to the exposed (101) facets of anatase nano-titania. Acid sites with moderate- and superacidic strength formed in the sulfated titania catalyst. Also, the as-prepared sulfated sample possessed both Lewis and Brønsted acid sites. The catalytic activity of sulfated nano-titania with exposed (101) facets was evaluated using the esterification reaction between acetic acid and n-butanol. It was found that the yield of butyl acetate increased to about 92.2% in the presence of the catalyst. Compared with the exposed (001) facets, the exposed (101) facets showed better catalytic activity of sulfated TiO2 in esterification. The effects of different reaction conditions were discussed in detail. Additionally, the as-prepared sulfated sample could be efficiently recycled and regenerated by simple soaking in sulfuric acid followed by calcination.
Co-reporter:Hui Zhao, Yuming Dong, Pingping Jiang, Guangli Wang, Jingjing Zhang, Kun Li and Cuiyun Feng
New Journal of Chemistry 2014 vol. 38(Issue 4) pp:1743-1750
Publication Date(Web):12 Feb 2014
DOI:10.1039/C3NJ01523H
As a common monocomponent metal oxide, an α-MnO2 nanotube was synthesized by a simple hydrothermal method and developed as an ozonation catalyst for the first time. α-MnO2 nanotubes revealed excellent catalytic activity and stability for degradation of phenol in water. The strong interaction between ozone and α-MnO2 in water was observed and confirmed as a critical step of catalysis. The IR analysis and the influence of phosphate showed that the surface hydroxyl groups and chemisorbed water acted as the active sites in promoting active oxygen species, while Lewis acid sites were confirmed as reactive centers for catalytic ozonation in the aqueous phase. The ˙OH, O2˙−, *O2 and *O were not mainly involved in the catalytic ozonation of phenol based on the corresponding experimental results. According to the X-ray photoelectron spectroscopy (XPS) results, in the presence of α-MnO2, electrons from the surface Mn(III) were responsible for the catalysis and the oxidation of lattice oxygen enhanced the reversion of Mn(IV) to Mn(III). The balance between Mn(III)/Mn(IV) and O(–II)/O(0) was the primary factor for the catalytic performance of α-MnO2.
Co-reporter:Weijie Zhang, Pingping Jiang, Ying Wang, Jian Zhang, Yongxue Gao and Pingbo Zhang
RSC Advances 2014 vol. 4(Issue 93) pp:51544-51547
Publication Date(Web):24 Sep 2014
DOI:10.1039/C4RA09304F
We synthesized a readily accessible molybdenum-doped covalent-organic framework catalyst (Mo-COF) linked by a hydrazine linkage via a facile two-step bottom-up approach. This Mo-COF catalyst, as an open nanochannel-reactor, exhibited promising catalytic activity for the selective oxidation reaction.
Co-reporter:Hui Zhao;Yuming Dong
Reaction Kinetics, Mechanisms and Catalysis 2014 Volume 113( Issue 2) pp:445-458
Publication Date(Web):2014 December
DOI:10.1007/s11144-014-0756-5
In this work, sulfated TiO2 nanostructures with different morphology structures and anatase/rutile phase ratios were synthesized by a hydrothermal method followed by calcination. The nanotube, nanorod and nanoparticle morphologies were obtained by varying the hydrothermal and/or annealing temperatures, and the anatase/rutile phase ratio was adjusted by controlling the annealing temperature. The characterization indicated well dispersed bidentate SO42− linked to the TiO2 surface. The catalytic activity of the synthesized sample was evaluated by the esterification of acetic acid with n-butanol. It was shown that the prepared sulfated titania possessed different catalytic activity. Effects of different reaction conditions were discussed. The catalytic activity was dominated by the concentration of surface acid sites of the catalyst. Hence, with the help of TEM, SEM, XRD and BET analyses, the concentration of surface acid sites per unit area of sulfated TiO2 was correlated with the type of morphology and increased linearly with the rutile phase content. The nanoparticle morphology and high rutile phase ratio were favorable for the catalytic activity per unit area of sulfated TiO2 in our experiments.
Co-reporter:Weijie Zhang;Jianghao Wu
Reaction Kinetics, Mechanisms and Catalysis 2014 Volume 112( Issue 1) pp:147-158
Publication Date(Web):2014 June
DOI:10.1007/s11144-014-0676-4
The catalytic efficiency of modified tetraphenylporphyrins with various metals (Mn, Fe, Co, Ni and Zn) and different electron-donating substituents (–OCH3, –OH, –N(CH3)2, –SO3Na) at the phenyl para-positions using hydrogen peroxide (H2O2, 30 wt%) as the oxidant has been researched in the epoxidation of unsaturated fatty acid methyl esters (FAMEs) under mild conditions. In the present system, the co-catalyst effect of inorganic salts had a crucial role in enhancing catalytic performance. According to the yields, the catalytic activities of metalloporphyrins were in the following order: Mn(TPP)Cl ≈ Fe(TPP)Cl > CoTPP > NiTPP > ZnTPP, and Mn(TPP)Cl > Mn(TMOPP)Cl ≈ Mn(THPP)Cl > Mn(TDMPP)Cl > Mn(TPPS4)Cl. Moreover, metalloporprhyrins after modification by electron-donating substituents displayed promoted thermolysis temperatures. Remarkably, the formation of intermediate porMnV=O has also been indicated, which was verified by both a kinetic study of FAMEs epoxidation and UV–Vis spectroscopy.
Co-reporter:Pingping Jiang;Yinyin Song;Yuming Dong;Cuirong Yan;Peng Liu
Journal of Applied Polymer Science 2013 Volume 127( Issue 5) pp:3681-3686
Publication Date(Web):
DOI:10.1002/app.37985
Abstract
Zinc glycerolate (ZnGly) was prepared and used as a poly(vinyl chloride) (PVC) thermal stabilizer in this work. ZnGly was characterized by Fourier transform infrared spectroscopy (FT-IR), X-ray diffraction (XRD), thermogravimetry (TGA), and transmission electron microscopy (TEM). Visual color evolution and thermal stability time at 180°C were used to examine the stabilizing efficiency of the samples. The thermal stability of PVC was significantly enhanced through adding ZnGly or ZnGly with lanthanum stearate (LaSt3). Compared with zinc stearate (ZnSt2), it was demonstrated the initial color stability was markedly improved and the thermal stability time was obviously extended by adding ZnGly. The thermal stability time of ZnGly was threefold than ZnSt2. In comparison with CaSt2/ZnSt2, the extent of coloration of PVC samples was significantly inhibited though adding LaSt3/ZnGly. It was verified that the appropriate percents of ZnGly in the mixture were between 25 and 50%. A possible mechanism for the stabilizing efficiency of ZnGly was also proposed. The stabilizing efficiency was attributed to the stabilizer's ability to absorb hydrogen chloride and replace the labile chlorine atoms on PVC chains. Moreover, the dynamic thermogravimetric analysis was used to confirm that combination of LaSt3 with ZnGly presented an obvious improvement of stability on thermal degradation of PVC. © 2012 Wiley Periodicals, Inc. J. Appl. Polym. Sci., 2013
Co-reporter:Pingping Jiang;Min Chen;Yuming Dong
Journal of the American Oil Chemists' Society 2010 Volume 87( Issue 1) pp:83-91
Publication Date(Web):2010 January
DOI:10.1007/s11746-009-1469-1
A series of new organometallic catalysts for epoxidized vegetable oils using H2O2 in a biphasic system were investigated. The effect of reaction parameters such as the amount of hydrogen peroxide, reaction time and temperature in the epoxidation of soybean oil are discussed in detail. A selectivity of 83.8% was obtained in 4 h at 60 °C, when [(C18H37)2N(CH3)2]3{PO4[WO(O2)2]4} was used as the catalyst. When methyltrioxorhenium (MTO), imidazole and CH3CN were used as the catalyst, adduct, and solvent respectively, a selectivity of 99.90% was achieved in 4 h at 20 °C. The catalytic system was used for the epoxidation of other oils, whose results showed it was active in the epoxidation of long-chain unsaturated compounds. Furthermore, the reaction of H2O2 with methyltrioxorhenium was studied by UV–Vis spectroscopy, which revealed the active peroxorhenium complexes formed during the reaction. Epoxidation of these oils with organometallic compounds occurred through the interactions between the oils unsaturated sites HOMO π(C–C) and the unoccupied peroxo σ*(O–O) orbital.
Co-reporter:Xia Ye;Pingbo Zhang;Yuming Dong;Chengsheng Jia
Catalysis Letters 2010 Volume 137( Issue 1-2) pp:88-93
Publication Date(Web):2010 June
DOI:10.1007/s10562-010-0334-z
The novel mesoporous materials containing titanium and manganese, Ti-HMS (50) and Mn-HMS (50) (the number 50 denoting the Si/metal of molar ratio), were synthesized using laurylamine as template at room temperature. They were characterized by a series of techniques including powder XRD, FT-IR, UV–Vis spectroscopy, TEM, TG and Nitrogen physisorption. The results indicated that titanium and manganese had been incorporated into the HMS and both them had a wormhole mesopore structure. It also suggested that Mn2+ and Mn3+ coexisted in the Mn-HMS, Ti4+ in Ti-HMS. Besides, epoxidation of soybean oil over these synthesized catalysts was performed using tert-butyl hydroperoxide (TBHP) as oxidant. An increase in the activity was observed when surface area, pore diameter and hydrophobic nature were increased, which meant more active center reacting with soybean oil (SBO), also could reduce the energy barrier and avoid the oxirane ring opening. Furthermore, the result indicated that Mn-HMS showed a higher selectivity (up to 82.9% for Mn and 51.1% for Ti), but Ti-HMS exhibited a better conversion.
Co-reporter:Yirui Shen, Pingping Jiang, Jian Zhang, Gang Bian, Pingbo Zhang, Yuming Dong, Weijie Zhang
Molecular Catalysis (May 2017) Volume 433() pp:212-223
Publication Date(Web):1 May 2017
DOI:10.1016/j.mcat.2016.12.011
•Highly dispersed molybdenum incorporated hollow mesoporous silica catalysts for epoxidation were prepared.•A modified immersion method was put forward to decline the pore-filling effect in channels.•Catalysts with special structure exhibited superior transportation from hollow interior and isolated active sites in shell.•The catalysts provided excellent reactivity and stability.Highly dispersed Molybdenum (VI) incorporated hollow mesoporous silica catalyst was facilely synthesized with a selective etching strategy and then followed with a modified immersion method. Firstly, hollow mesoporous silica spheres were obtained from solid silica spheres with the interaction of cetyltrimethyl ammonium bromide (CTAB) and Na2CO3. Then the catalytic sites were loaded by modified and direct immersion methods as comparison. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), N2 adsorption/desorption and X-ray photoelectron spectra (XPS). The reactivity of the catalysts was also detected under the same condition in olefin epoxidation. Compared with these two immersion methods, modified method exhibited the best turnover number of 3873 at 6 h with a better reactivity and textural properties than direct one. Highly dispersed molybdenum indeed brought excellent activity and high stability. The conversion could reach 100% with a selectivity above 99% after 12 h. And the catalyst still had a conversion above 86% and a selectivity above 93% after five runs. More importantly, this modified immersion method could also be widely used in the preparation of catalysts as a simple but efficient way.Download full-size image
Co-reporter:Weijie Zhang, Pingping Jiang, Ying Wang, Jian Zhang, Pingbo Zhang
Applied Catalysis A: General (January 2015) Volume 489() pp:117-122
Publication Date(Web):January 2015
DOI:10.1016/j.apcata.2014.10.023
Co-reporter:Weijie Zhang, Pingping Jiang, Ying Wang, Jian Zhang, Pingbo Zhang
Applied Catalysis A: General (25 July 2016) Volume 522() pp:
Publication Date(Web):25 July 2016
DOI:10.1016/j.apcata.2016.05.005
Co-reporter:Ying Wang, Pingping Jiang, Weijie Zhang, Jiawei Zheng
Applied Surface Science (1 April 2013) Volume 270() pp:
Publication Date(Web):1 April 2013
DOI:10.1016/j.apsusc.2013.01.082
Manganese(III) 5-(4-carboxyphenyl)-10,15,20-triphenylporphyrin chloride (Mn(TCPP)Cl) was grafted through amide bond on magnetic polyglycidyl methacrylate (mPGMA) cross-linked by divinylbenzene (DVB). XRD, ICP-AES, N2 physisorption, SEM, TEM, FTIR and thermal analysis were employed to analyze these novel materials. mPGMA supported catalyst was used for epoxidation with structural durability and steadily reusability. Mn-NH-mPGMA as biomimetic catalyst caused a liquid–solid heterogeneous epoxidation system, and exhibited an excellent conversion with high selectivity at room temperature. Catalytic activity remained when catalyst was recycled seven times. The recycled experiments presented in this article indicated that Mn(TCPP)Cl grafted on mPGMA was suitable for efficient isolation with high recovery yield.Graphical abstractHighlights► Manganese porphyrin grafted on magnetic polyglycidyl methacrylate through amide bond as a novel material. ► Catalyst was suitable for efficient isolation with high recovery yield. ► An excellent conversion with high selectivity was observed. ► The catalytic activity remained when the catalysts were recycled seven times.
Co-reporter:Hui Zhao, Yuming Dong, Pingping Jiang, Guangli Wang, Jingjing Zhang and Kun Li
Catalysis Science & Technology (2011-Present) 2014 - vol. 4(Issue 2) pp:NaN501-501
Publication Date(Web):2013/11/04
DOI:10.1039/C3CY00674C
In this paper, the kinetics and interface sensitivity of nano-sized magnetic NiFe2O4 in incomplete catalytic ozonation were investigated in detail. By analyzing the kinetics of heterogeneous reactions, it was found that both the degradation of phenol and the decomposition of molecular ozone appeared to follow a first order kinetics model and the presence of nano-NiFe2O4 significantly enhanced these processes. The kinetics equations and reaction rate constants were determined according to experimental results. In light of the IR spectra, the Lewis acid sites were further confirmed as reactive centers for catalytic ozonation in the aqueous phase, and the reason for deactivation of the NiFe2O4 nanocatalyst during incomplete ozonation of organic compounds was determined. The catalytic activity of the NiFe2O4 nanocatalyst could be completely recovered by calcination and ozonation methods, which makes it an attractive nanomaterial with prospective applications in water treatment. According to the interface sensitivity of ozone in water, a strong interaction between ozone and NiFe2O4 was observed and the role of water was revisited. Water molecules were clarified as two different types: one is chemisorbed water on the catalyst surface and the other is bulk water in aqueous solution. Both bulk and chemisorbed water molecules should be weak competitors compared with ozone, and the chemisorbed water on the catalyst surface was proposed not as an inhibitor but an accelerator for catalytic activity.
Co-reporter:Weijie Zhang, Ying Wang, Yan Leng, Pingbo Zhang, Jian Zhang and Pingping Jiang
Catalysis Science & Technology (2011-Present) 2016 - vol. 6(Issue 15) pp:NaN5855-5855
Publication Date(Web):2016/04/20
DOI:10.1039/C6CY00538A
In efforts to replicate the 3D model and desirable function of haemoglobin, the zeolite imidazolate framework (ZIF-8) was delineated for an ideal host matrix to accommodate custom-designed porphyrin molecules via hydrogen bonding, thus providing a suitable micro-environment similar to the protein skeleton around the active sites in haemoglobin. The spectral investigations including X-ray photoelectron spectroscopy (XPS) tests and Raman spectra, together with the experimental details and computational simulations, showed that it is a weak hydrogen bond that drives guests into the cage of ZIF-8. At the atomic level, the amino substituent on Mn-TAPP coupled with the C–H on the 2-methylimidazolate (MeIM) constitutes the host–guest interaction (Por-N⋯H-MeIM). In particular, this novel heterogeneous catalyst, denoted as Mn-TAPP@ZIF-8, shows an enhanced catalytic efficiency (up to 7600 ton) compared to the homogeneous complexes and other reported studies, strongly supporting the synergistic interplay raised from the hydrogen bond.
Co-reporter:Hui Zhao, Yuming Dong, Pingping Jiang, Hongyan Miao, Guangli Wang and Jingjing Zhang
Journal of Materials Chemistry A 2015 - vol. 3(Issue 14) pp:NaN7381-7381
Publication Date(Web):2015/02/17
DOI:10.1039/C5TA00402K
MoS2-decorated graphitic C3N4 (g-C3N4/MoS2) photocatalysts were prepared by a simple and scalable in situ light-assisted method. In this process, MoS2 was formed from the reduction of [MoS4]2− by photogenerated electrons, and was then loaded in situ on the electron outlet points of g-C3N4. The g-C3N4/MoS2 composite was well characterized by X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy (Raman), transmission electron microscopy (TEM), energy dispersive X-ray spectroscopy (EDX), and ultraviolet visible diffuse reflection spectroscopy (UV-DRS). The g-C3N4/MoS2 photocatalysts showed good photocatalytic H2 evolution activity. When the loading amount of MoS2 was increased to 2.89 wt% (g-C3N4/MoS2-2.89%), the highest H2 evolution rate (252 μmol g−1 h−1) was obtained. In addition, g-C3N4/MoS2-2.89% presented stable photocatalytic H2 evolution ability (no noticeable degradation of photocatalytic H2 evolution was detected in 18 h) and good natural light driven H2 evolution ability (the H2 evolution rate was 320 μmol g−1 h−1). A possible photocatalytic mechanism of the MoS2 cocatalyst for the improvement of the photocatalytic activity of g-C3N4 is proposed, where MoS2 can efficiently promote the separation of the photogenerated electrons and holes of g-C3N4, consequently enhancing the H2 evolution activity; this mechanism is supported by the photoluminescence spectroscopy and photoelectrochemical analyses.
Co-reporter:Weijie Zhang, Pingping Jiang, Ying Wang, Jian Zhang and Pingbo Zhang
Catalysis Science & Technology (2011-Present) 2015 - vol. 5(Issue 1) pp:NaN104-104
Publication Date(Web):2014/09/02
DOI:10.1039/C4CY00969J
Two kinds of novel functional covalent organic frameworks were assembled with the porphyrin building block and terephthalaldehyde or squaric acid via bottom-up approach. Here, our reported covalent porphyrinic frameworks with coordinated manganese(III) ions (Mn–CPF-1 and Mn–CPF-2) present promising catalytic properties for the selective oxidation of olefins.
![3-METHYL-1-[6-(3-METHYL-1,2-DIHYDROIMIDAZOL-1-IUM-1-YL)HEXYL]-1,2-DIHYDROIMIDAZOL-1-IUM;DIBROMIDE](/data/chemimg/557000/349081-22-7.png)
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