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题名: Surface structure and reaction performances of highly dispersed and supported bimetallic catalysts
作者: Lin, LW;  Yang, WS;  Jia, JF;  Xu, ZS;  Zhang, T;  Fan, YN;  Kou, Y;  Shen, JY
关键词: metallic catalysis ;  isobutane ;  dehydrogenation ;  M-1 sites ;  M-2 sites
刊名: SCIENCE IN CHINA SERIES B-CHEMISTRY
发表日期: 1999-12-01
卷: 42, 期:6, 页:571-580
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Surface structures of Pt-Sn and Pt-Fe bimetallic catalysts have been investigated by means of Mossbauer spectroscopy, Pt-L-III -edge EXAFS and H-2-adsorption. The results showed that the second component, such as Sn or Fe, remained in the oxidative state and dispersed on the gamma-Al2O3 surface after reduction, while Pt was completely reduced to the metallic state and dispersed on either the metal oxide surface or the gamma-Al2O3 surface. By correlating the distribution of Pt species on different surfaces with the reaction and adsorption performances, it is proposed that two kinds of active Pt species existed on the surfaces of both catalysts, named M-1 sites and M-2 sites. M-1 sites are the sites in which Pr directly anchored on the gamma-Al2O3 surface, while M-2 sites are those in which Pt anchored on the metal oxide surface. M-1 sites are favorable for low temperature H-2 adsorption, and responsible for the hydrogenolysis reaction and carbon deposition, while M-2 sites which adsorb more H-2 at higher temperature, are more resistant to the deactivation due to less carbon deposition, and provide major contribution to the dehydrogenation reaction.
关键词[WOS]: ALUMINA ;  EXAFS ;  IRON
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000084653800003
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/86609
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:
Lin, LW,Yang, WS,Jia, JF,et al. Surface structure and reaction performances of highly dispersed and supported bimetallic catalysts[J]. SCIENCE IN CHINA SERIES B-CHEMISTRY,1999,42(6):571-580.
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