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题名: The effect of calcination time on the activity of WO3/Al2O3/HY catalysts for the metathesis reaction between ethene and 2-butene
作者: Huang, Shengjun;  Liu, Shenglin;  Zhu, Qingjun;  Zhu, Xiangxue;  Xin, Wenjie;  Liu, Huijuan;  Feng, Zaochi;  Li, Can;  Xie, Sujuan;  Wang, Qingxia;  Xu, Longya
通讯作者: 徐龙伢
关键词: metathesis ;  tungsten oxide catalysts ;  gamma-Al2O3 ;  HY zeolite ;  UV-Vis ;  UV Raman ;  surface tungstate
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 2007-04-30
DOI: 10.1016/j.apcata.2007.02.004
卷: 323, 页:94-103
收录类别: SCI
文章类型: Article
部门归属: 8,5
项目归属: 804,503
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: A series of WO3/Al2O3/HY catalysts were prepared by thermal spread method (i.e., calcination of physically mixed WO3, Al2O3 and HY zeolite) for the metathesis reaction between ethene and 2-butene to propene. The transformation of tungsten oxide species was studied by the characterization techniques of XRD, H-2-TPR, UV-Vis, UV Resonance Raman, NH3-TPD and N-2 adsorption-desorption techniques. The thermal spread effect during calcination results in the dispersion of bulk WO3 phase into microcrystallites on gamma-Al2O3 surface, followed by a chemical transformation to the monomeric surface tungstate species via the involvement of Bronsted acid sites of HY zeolite. These monomeric surface tungstate species, identified by a characteristic Raman band at 970 cm(-1), are crucial for the metathesis activity. We suggest such activity related species are tetrahedrally coordinated. Moreover, it is found that there is an optimal calcination time for the formation of these WO42- species and further calcination causes the condensation to the polytungstate clusters, which are less active for the metathesis reaction. The optimized catalyst shows superior catalytic activity of metathesis reaction between ethene and 2-butene to propene at 453 K with 2-butene conversion close to thermodynamic equilibrium value (similar to 64%). (C) 2007 Elsevier B.V. All rights reserved.
关键词[WOS]: TUNGSTEN-OXIDE ;  W/HZSM-5 CATALYSTS ;  RAMAN-SPECTROSCOPY ;  OLEFIN METATHESIS ;  ALUMINA ;  ZEOLITES ;  HYDRODESULFURIZATION ;  ISOMERIZATION ;  TEMPERATURE ;  REDUCTION
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000246754200011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/98815
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Huang, Shengjun,Liu, Shenglin,Zhu, Qingjun,et al. The effect of calcination time on the activity of WO3/Al2O3/HY catalysts for the metathesis reaction between ethene and 2-butene[J]. APPLIED CATALYSIS A-GENERAL,2007,323:94-103.
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