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题名: Insights into the Deactivation Mechanism of Heterogeneous Mo/H beta-Al2O3 Catalysts for Olefin Metathesis
作者: Li, Xiujie1;  Zhang, Weiping1;  Li, Xin1;  Liu, Shenglin1;  Huang, Huijuan1;  Han, Xiuwen1;  Xu, Longya1;  Bao, Xinhe1
刊名: JOURNAL OF PHYSICAL CHEMISTRY C
发表日期: 2009-05-14
DOI: 10.1021/jp901103e
卷: 113, 期:19, 页:8228-8233
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Chemistry, Physical ;  Nanoscience & Nanotechnology ;  Materials Science, Multidisciplinary
研究领域[WOS]: Chemistry ;  Science & Technology - Other Topics ;  Materials Science
英文摘要: On-stream deactivation during metathesis reaction of ethene and butene-2 to propene over Mo/H beta-Al2O3 catalysts was examined. TG, TPO, solid-state NMR, UV-vis, EPR, and XPS techniques were used to characterize the nature and location of carbonaceous deposits as well as the oxidation state of Mo species on the fresh, used, and regenerated catalysts. It is found that side reaction of olefin oligomerization takes place simultaneously with the metathesis reaction even at low temperature. Most of the carbonaceous species are formed at the beginning of the reaction, and long-chain alkanes are the predominant coke species. There are three types of carbonaceous deposits located at different positions within the Mo/H beta-Al2O3 catalysts. Most of the aliphatic hydrocarbons formed with time on stream are associated with molybdenum species of the catalyst. Active sites poisoned by coke and deep reduction of Mo species may be responsible for catalyst deactivation. The recovery of the activity of regenerated catalyst further proves our proposed deactivation mechanism.
关键词[WOS]: MOLYBDENA-ALUMINA CATALYSTS ;  SOLID-STATE NMR ;  SUPPORTED MOLYBDENUM ;  ZEOLITES ;  PROPENE ;  ISOMERIZATION ;  SPECTROSCOPY ;  ABSORPTION ;  REDUCTION ;  COKING
语种: 英语
WOS记录号: WOS:000265895500038
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/141510
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:
Li, Xiujie,Zhang, Weiping,Li, Xin,et al. Insights into the Deactivation Mechanism of Heterogeneous Mo/H beta-Al2O3 Catalysts for Olefin Metathesis[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2009,113(19):8228-8233.
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