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Surface structure and reaction performances of highly dispersed and supported bimetallic catalysts
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
1999-12-01
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
关键词[WOS]ALUMINA ; EXAFS ; IRON
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.
语种英语
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WOS记录号WOS:000084653800003
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被引频次:39[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/86609
专题中国科学院大连化学物理研究所
作者单位Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China
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GB/T 7714
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.
APA Lin, LW.,Yang, WS.,Jia, JF.,Xu, ZS.,Zhang, T.,...&Shen, JY.(1999).Surface structure and reaction performances of highly dispersed and supported bimetallic catalysts.SCIENCE IN CHINA SERIES B-CHEMISTRY,42(6),571-580.
MLA Lin, LW,et al."Surface structure and reaction performances of highly dispersed and supported bimetallic catalysts".SCIENCE IN CHINA SERIES B-CHEMISTRY 42.6(1999):571-580.
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