Weiming Hua

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Name: 华伟明; WeiMing Hua

Organization: Fudan University , China

Department: Department of Chemistry and Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials

Title: Professor(PhD)

TOPICS

Inorganic Chemistry

Chemicals
References

Direct conversion of bio-ethanol to propylene in high yield over the composite of In2O3 and zeolite beta

Co-reporter:Fangqi Xue;Changxi Miao;Yinghong Yue;Zi Gao

Green Chemistry (1999-Present) 2017 vol. 19(Issue 23) pp:5582-5590

Publication Date(Web):2017/11/27

DOI:10.1039/C7GC02400B

A series of In2O3-beta composites with different contents of zeolite beta were prepared by the deposition–precipitation method, followed by calcination at 700 °C, and their catalytic performance in the conversion of ethanol to propylene (ETP) was investigated. The physicochemical properties of the as-synthesized materials were characterized by XRD, N2 adsorption, SEM, NH3-TPD, CO2-TPD and a probe reaction. The combination of In2O3 and zeolite beta improves the propylene yield significantly. The optimal result was observed for the composite with a beta content of 20–50%, which gave ca. 50% yield of propylene. The role of beta in the In2O3-beta composite catalyst is to promote the conversion of the intermediate of acetone to propylene via an additional reaction pathway, which accounts for the superior propylene yield of the In2O3-beta composite in comparison with In2O3 (ca. 32%). The proximity of these two components (In2O3 and zeolite beta) plays a crucial role in achieving a high yield of propylene for the ETP reaction.

Dehydrogenation of Isobutane to Isobutene with Carbon Dioxide over SBA-15-Supported Chromia-Ceria Catalysts

Co-reporter:Chunling Wei;Fangqi Xue;Changxi Miao;Yinghong Yue;Weimin Yang;Zi Gao

Chinese Journal of Chemistry 2017 Volume 35(Issue 10) pp:1619-1626

Publication Date(Web):2017/10/01

DOI:10.1002/cjoc.201700120

A series of SBA-15-supported chromia-ceria catalysts with 3% Cr and 1%–5% Ce (3Cr-Ce/SBA) were prepared using an incipient wetness impregnation method. The catalysts were characterized by XRD, N2 adsorption, SEM, TEM-EDX, Raman spectroscopy, UV–vis spectroscopy, XPS and H2-TPR, and their catalytic performance for isobutane dehydrogenation with CO2 was tested. The addition of ceria to SBA-15-supported chromia improves the dispersion of chromium species. 3Cr-Ce/SBA catalysts are more active than SBA-15-supported chromia (3Cr/SBA), which is due to a higher concentration of Cr6+ species present on the former catalysts. The 3Cr-3Ce/SBA catalyst shows the highest activity, which gives 35.4% isobutane conversion and 89.6% isobutene selectivity at 570 °C after 10 min of the reaction.

Catalytic decomposition of N2O over Rh/Zn–Al2O3 catalysts

Co-reporter:Chengyun Huang;Zhen Ma;Changxi Miao;Yinghong Yue;Zi Gao

RSC Advances (2011-Present) 2017 vol. 7(Issue 8) pp:4243-4252

Publication Date(Web):2017/01/10

DOI:10.1039/C6RA25388A

Zn–Al2O3 supports were prepared by impregnating commercial γ-Al2O3 powders with different amounts of Zn(NO3)2, followed by calcination in air at 500 or 800 °C. Rh/Zn–Al2O3 catalysts were then prepared by impregnating Zn–Al2O3 supports with Rh(NO3)3 followed by calcination in air at 500 °C. The catalysts and/or supports were characterized by ICP-OES, XRD, N2 adsorption, Raman spectroscopy, TEM-EDX, XPS, CO2-TPD, H2-TPR, and O2-TPD, and the catalytic performance of supported Rh catalysts in N2O decomposition was tested. It is concluded that the support can be described as ZnO/Al2O3 (ZnO supported on Al2O3) when calcining Zn(NO3)2/Al2O3 at 500 °C, whereas ZnAl2O4 spinel forms on the Al2O3 surface at 800 °C. Rh/Zn–Al2O3 catalysts are much more active than Rh/Al2O3 and Rh/ZnO. The best catalyst (Rh/Zn–Al2O3-800 with 1 wt% Rh and 1 wt% Zn) has the smallest Rh2O3 particle size and can desorb O2 at lower temperature than other catalysts. Both factors may be important for achieving high activity in N2O decomposition.

Hydroxyapatite-supported rhodium catalysts for N2O decomposition

Co-reporter:Chengyun Huang, Zhen Ma, Pengfei Xie, Yinghong Yue, Weiming Hua, Zi Gao

Journal of Molecular Catalysis A: Chemical 2015 400() pp: 90-94

Publication Date(Web):

DOI:10.1016/j.molcata.2015.02.011

Catalytic decomposition of N2O over Cu-ZSM-11 catalysts

Co-reporter:Pengfei Xie, Zhen Ma, Haibo Zhou, Chengyun Huang, Yinghong Yue, Wei Shen, Hualong Xu, Weiming Hua, Zi Gao

Microporous and Mesoporous Materials 2014 Volume 191() pp:112-117

Publication Date(Web):June 2014

DOI:10.1016/j.micromeso.2014.02.044

•The Cu-ZSM-11 catalysts are firstly used in direct N2O decomposition.•Cu-ZSM-11 is obviously more active than Cu-ZSM-5 with the same Si/Al ratio.•Enhanced activity is due to better reducibility and accessibility of Cu+ species.The catalytic decomposition of N2O was investigated over a series of Cu-ZSM-11 catalysts with different Si/Al ratios. The physicochemical properties of the catalysts were characterized by XRD, N2 adsorption, SEM, 27Al MAS NMR, DRIFTS, XPS, and H2-TPR. These catalysts were found to be effective for N2O decomposition. The catalytic activity in terms of conversion decreases when the Si/Al ratio increases, due to the decreased amount of active Cu+ species and the weakened reducibility of active sites. A comparison of Cu-ZSM-11 and Cu-ZSM-5 with the same Si/Al ratio demonstrates that Cu-ZSM-11 is apparently more active than Cu-ZSM-5, due to the enhanced reducibility of active Cu+ species and better accessibility of active sites in Cu-ZSM-11.Graphical abstract

Hydrothermal conversion of Fe2O3/SiO2 spheres into Fe2O3/Silicalite-1 nanowires: Synthesis, characterization, and catalytic properties

Co-reporter:Pengfei Xie, Lifeng Chen, Zhen Ma, Chengyun Huang, Zhiwei Huang, Yinghong Yue, Weiming Hua, Yi Tang, Zi Gao

Microporous and Mesoporous Materials 2014 200() pp: 52-60

Publication Date(Web):

DOI:10.1016/j.micromeso.2014.08.020

Dehydrogenation of Propane to Propylene in the Presence of CO2 over Steaming-treated HZSM-5 Supported ZnO

Co-reporter:Fan Zhang;Changxi Miao;Yinghong Yue;Zi Gao

Chinese Journal of Chemistry 2012 Volume 30( Issue 4) pp:929-934

Publication Date(Web):

DOI:10.1002/cjoc.201100379

Abstract

Dehydrogenation of propane to propylene over zinc oxide catalysts supported on steaming-treated HZSM-5 in the presence of CO₂ has been investigated. The highest catalytic performance can be achieved on the 5%ZnO/HZSM-5(650) catalyst with the HZSM-5 support steaming at 650°C, which allows the maximum propylene yields of 29.7% and 20.3% at the initial and steady states, respectively, in the catalytic dehydrogenation of propane at 600°C. The superior catalytic performance of this catalyst can be attributed to high dispersion of ZnO and appropriate Br?nsted acidity of the HZSM-5(650) support. The catalytic stability is enhanced by the addition of CO₂ to the feed gas due to the suppression of coke formation.

Chromium oxide supported on ZSM-5 as a novel efficient catalyst for dehydrogenation of propane with CO2

Co-reporter:Fan Zhang, Runxia Wu, Yinghong Yue, Weimin Yang, Songyuan Gu, Changxi Miao, Weiming Hua, Zi Gao

Microporous and Mesoporous Materials 2011 Volume 145(1–3) pp:194-199

Publication Date(Web):November 2011

DOI:10.1016/j.micromeso.2011.05.021

Liquid-phase -Pinene Isomerization over Fe-doped Sulfated Zirconia Prepared by a Hydrothermal Treatment-assisted Process

Co-reporter:Jianfeng Liu;Jie Zhao;Changxi Miao;Yinghong Yue;Zi Gao

Chinese Journal of Chemistry 2011 Volume 29( Issue 6) pp:1095-1100

Publication Date(Web):

DOI:10.1002/cjoc.201190206

Abstract

A series of Fe-doped (0.5%–3%) sulfated zirconia have been prepared by a hydrothermal treatment-assisted process. Textural and structural characterizations of the as-synthesized materials were performed by means of N₂ adsorption, X-ray diffraction, transmission electron microscopy, scanning electron microscopy and thermogravi- metric analysis. Temperature-programmed desorption of ammonia was used to determine the acidity of the samples. The effects of Fe-doping on the structure, acidity and catalytic activity of sulfated zirconia for liquid-phase α-pinene isomerization were investigated. The incorporation of small amounts of Fe into sulfated zirconia results in the increase of sulfate content and the number of acid sites, which is responsible for the enhanced activity of Fe-doped catalysts in comparison with the undoped one. Meanwhile, hydrothermal treatment helps to improve the activity of the catalyst.

Vanadium oxide supported on mesoporous MCM-41 as new catalysts for dehydrogenation of ethylbenzene with CO2

Co-reporter:Yanyan Qiao, Changxi Miao, Yinghong Yue, Zaiku Xie, Weimin Yang, Weiming Hua, Zi Gao

Microporous and Mesoporous Materials 2009 Volume 119(1–3) pp:150-157

Publication Date(Web):1 March 2009

DOI:10.1016/j.micromeso.2008.10.010

Characterization and Catalytic Activities of Al2O3-Promoted Sulfated Tin Oxides

Co-reporter:Jie Zhao;Yinghong Yue;Dewei Zhai;Changxi Miao;Jianyi Shen

Catalysis Letters 2009 Volume 133( Issue 1-2) pp:

Publication Date(Web):2009 November

DOI:10.1007/s10562-009-0164-z

A series of Al2O3-doped (0.5–3 mol%) sulfated tin oxides have been prepared by a co-precipitation method, followed by sulfation and calcination. Textural and structural characterizations of these samples were performed by means of XRD, N2 adsorption, XPS, DTG, Raman spectroscopy, diffuse reflectance UV-vis spectroscopy and 27Al MAS NMR. FT-IR spectra of adsorbed pyridine were used to determine the acid properties. The addition of small amounts of Al2O3 (0.2–1.5 mol%) to sulfated tin oxide brings about a dramatic improvement of catalytic activity from 36.1 to 52.4–58.0% for acylation of 2-methoxynaphthalene with acetic anhydride.

Regular HZSM-5 microboxes prepared via a mild alkaline treatment

Co-reporter:Changsong Mei, Zhicheng Liu, Pengyu Wen, Zaiku Xie, Weiming Hua and Zi Gao

Journal of Materials Chemistry A 2008 vol. 18(Issue 29) pp:3496-3500

Publication Date(Web):19 Jun 2008

DOI:10.1039/B805385E

HZSM-5 zeolite microboxes with a thin intact shell and large hollow core have been synthesized by a mild alkaline treatment of ZSM-5 single-crystals with Na2CO3 solution. The obtained product was characterized by means of N2 adsorption, XRD, FT-IR, TEM, and temperature-programmed desorption of ammonia. The morphology and architecture of the small zeolite microboxes are exceptionally uniform and regular. On the other hand, the intrinsic crystalline properties in the alkaline treated zeolite are well preserved. Furthermore, the zeolite microbox catalyst exhibits higher activity than the parent HZSM-5 by facilitating the diffusion of molecules.

Catalytic activities and properties of mesoporous sulfated Al2O3–ZrO2

Co-reporter:Jie Zhao;Yinghong Yue;Zi Gao

Catalysis Letters 2007 Volume 116( Issue 1-2) pp:27-34

Publication Date(Web):2007 July

DOI:10.1007/s10562-007-9085-x

Mesoporous sulfated Al2O3–ZrO2 (MSAZ) catalysts with large surface areas and pore volumes after calcination at high temperature (650 °C) and with higher Al2O3 content than 20wt% were successfully prepared from a template of block copolymer (P84). The MSAZ catalysts were characterized by X-ray diffraction (XRD), N2 adsorption, transmission electron microscopy (TEM), 27Al magic-angle spinning nuclear magnetic resonance (MAS NMR), thermogravimetric analysis (TG–DTG), temperature-programmed desorption of ammonia (NH3-TPD) and infrared spectra (IR) of adsorbed pyridine. It is shown that the resulting mesostructured sulfated Al2O3–ZrO2 samples have a well-developed textural mesoporosity. The number of acid sites present on MSAZ catalysts is higher than that on conventional sulfated zirconia, and the former catalysts are more active than the latter one for various acid-catalyzed reactions.

Effect of modifiers on the activity of a Cr2O3/Al2O3 catalyst in the dehydrogenation of ethylbenzene with CO2

Co-reporter:Xingnan Ye, Yinghong Yue, Changxi Miao, Zaiku Xie, Weiming Hua and Zi Gao

Green Chemistry 2005 vol. 7(Issue 7) pp:524-528

Publication Date(Web):31 May 2005

DOI:10.1039/B505781G

Chromium oxide supported on alumina was modified with various transition metal oxides by an incipient wetness method. The effect of modifiers on the activity of 20% Cr2O3/Al2O3 catalyst in the dehydrogenation of EB with CO2 was investigated. The activity is enhanced for ceria and vanadia modified supported chromium oxide catalysts, whereas the activity is decreased for catalysts modified with cobalt, manganese, molybdenum and zinc oxides. Carbon monoxide was detected in the course of the reaction, suggesting that carbon dioxide, which is one of the most important greenhouse gases, could be utilized as a mild oxidant in the oxidative dehydrogenation of ethylbenzene to styrene over unmodified and modified Cr2O3/Al2O3 catalysts.

Dehydrogenation of ethane to ethylene over a highly efficient Ga2O3/HZSM-5 catalyst in the presence of CO2

Co-reporter:Zhenhao Shen, Jian Liu, Hualong Xu, Yinghong Yue, Weiming Hua, Wei Shen

Applied Catalysis A: General (15 March 2009) Volume 356(Issue 2) pp:148-153

Publication Date(Web):15 March 2009

DOI:10.1016/j.apcata.2008.12.038

Selective production of propylene from methanol: Mesoporosity development in high silica HZSM-5

Co-reporter:Changsong Mei, Pengyu Wen, Zhicheng Liu, Hongxing Liu, Yangdong Wang, Weimin Yang, Zaiku Xie, Weiming Hua, Zi Gao

Journal of Catalysis (15 August 2008) Volume 258(Issue 1) pp:243-249

Publication Date(Web):15 August 2008

DOI:10.1016/j.jcat.2008.06.019

The mesoporosity development in high silica HZSM-5 was carried out by alkaline desilication treatment and soft template method, and its relationship with the catalytic performance of the modified catalysts in methanol-to-propylene reaction was studied. High propylene selectivity (42.2%) and propylene/ethylene ratio (10.1) were observed on the high silica HZSM-5 catalyst modified by alkaline desilication. The enhanced catalytic performance can be attributed to the newly created open mesopores on the surface of the zeolite crystals together with the low Brønsted acidity. A greater amount of mesoporosity could be readily formed in HZSM-5 crystals via the soft template route. However, the mesopores formed in this method are randomly distributed in the zeolite crystals and play a minor role in the molecular transport of the reaction, so the improvement in propylene selectivity and propylene/ethylene ratio of the catalyst is less evident. The higher propylene selectivity and propylene/ethylene ratio on modified HZSM-5 (especially by alkaline treatment) than unmodified HZSM-5 could be also related to different contributions of the methylaromatics route and olefins methylation/cracking route in MTP reaction.

Esterification and transesterification on Fe2O3-doped sulfated tin oxide catalysts

Co-reporter:Dewei Zhai, Yingying Nie, Yinghong Yue, Heyong He, Weiming Hua, Zi Gao

Catalysis Communications (10 March 2011) Volume 12(Issue 7) pp:593-596

Publication Date(Web):10 March 2011

DOI:10.1016/j.catcom.2010.12.020

A series of Fe2O3-doped (0.2–3.0%) sulfated tin oxides have been prepared by a co-precipitation method, followed by sulfation and calcination. The addition of small amounts of Fe2O3 to sulfated tin oxide results in an enhanced number of very strong and strong acid sites, which makes the Fe2O3-doped catalysts more active than the undoped one for esterification of lauric acid with methanol and transesterification of triacetin with methanol. The catalyst containing 1.0% Fe2O3 exhibits the highest activity for both biodiesel-forming type reactions.Download full-size imageDoping 0.2–3.0% Fe2O3 into sulfated tin oxide improved surface area, sulfate content and number of very strong and strong acid sites, which is responsible for their enhanced catalytic activities for esterification and transesterification.Research Highlights►Sulfated tin oxide was modified by small amounts of Fe2O3. ►Doping Fe2O3 into SO42−/SnO2 enhanced the number of very strong and strong acid sites. ►The addition of Fe2O3 to SO42−/SnO2 improved the activity for esterification and transesterification.

Catalytic activities and properties of sulfated zirconia supported on mesostructured γ-Al2O3

Co-reporter:Jie Zhao, Yinghong Yue, Weiming Hua, Heyong He, Zi Gao

Applied Catalysis A: General (1 March 2008) Volume 336(Issues 1–2) pp:

Publication Date(Web):1 March 2008

DOI:10.1016/j.apcata.2007.08.014

A novel mesoporous solid acid catalyst system was designed by loading sulfated zirconia into mesostructured γ-Al2O3. Their catalytic activities for conversion of n-pentane, Friedel–Crafts benzoylation of anisole with benzoyl chloride and dealkylation of 1,3,5-tri-tert-butyl-benzene were investigated. For comparison, sulfated zirconia and MCM-41 supported sulfated zirconia were also examined. Textural and structural characterizations of the catalysts were performed by means of N2 adsorption, X-ray diffraction and diffuse reflectance UV–vis spectroscopy. Temperature programmed desorption of ammonia and FTIR spectra of adsorbed pyridine were used to determine the acid properties. The results show that novel mesoporous solid acids exhibit superior catalytic performances to sulfated zirconia and MCM-41 supported sulfated zirconia. The enhanced performances of the novel mesoporous acid catalysts can be attributed to more acid sites and/or stronger acid strength.A novel mesoporous solid acid catalyst system was designed by loading sulfated zirconia into mesostructured γ-Al2O3. The results show that novel mesoporous solid acids exhibit higher catalytic activities than sulfated zirconia and MCM-41 supported sulfated zirconia. The enhanced activities can be attributed to more acid sites and/or stronger acid strength.

Regular HZSM-5 microboxes prepared via a mild alkaline treatment

Co-reporter:Changsong Mei, Zhicheng Liu, Pengyu Wen, Zaiku Xie, Weiming Hua and Zi Gao

Journal of Materials Chemistry A 2008 - vol. 18(Issue 29) pp:NaN3500-3500

Publication Date(Web):2008/06/19

DOI:10.1039/B805385E