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题名: An amorphous approach to the structure of a Pt-Fe/gamma-Al2O3 catalyst characterized by XAFS
作者: Lin, LW;  Kou, Y;  Zou, M;  Yan, Z
刊名: PHYSICAL CHEMISTRY CHEMICAL PHYSICS
发表日期: 2001
卷: 3, 期:9, 页:1789-1794
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical ;  Physics, Atomic, Molecular & Chemical
研究领域[WOS]: Chemistry ;  Physics
英文摘要: A Pt-Fe/gamma -Al2O3 catalyst has been investigated by means of Pt L-III-and Fe K-edge X-ray absorption fine structure (XAFS). X-Ray absorption near-edge structure (XANES) clearly indicates the formation of highly dispersed zerovalent Pt atoms on the surface after reduction. The iron precursor Fe2O3 is reduced to well-dispersed FeO. Six Pt neighbors at 2.72, 3.14 and 3.83 Angstrom, respectively, are found for each Pt atom on Pt/gamma -Al2O3. However, only one type of Pt neighbor, at 2.75 Angstrom with a low coordination number of 0.8, is detected for the Pt sites on Pt-Fe/Al2O3. An amorphous approach to rationalizing a possible structure of Pt-Fe/Al2O3 has been discussed at the atomic level by consideration of the surface coordinate geometry. The XAFS-derived parameters are highly commensurate with a sandwich model. An iron oxide phase with the stoichiometry Fe17O19 is present as an interface between Pt and gamma -Al2O3 while zerovalent Pt atoms are randomly distributed on the iron oxide surface as a mixture of monomers, dimers and trimers, well separated from each other.
关键词[WOS]: X-RAY-ABSORPTION ;  FINE-STRUCTURE EXAFS ;  COORDINATE GEOMETRY ;  WORKING CATALYSTS ;  METAL-CATALYSTS ;  IRON CATALYSTS ;  CO ADSORPTION ;  GAS-PHASE ;  RE-PT ;  DEHYDROGENATION
语种: 英语
WOS记录号: WOS:000168035300037
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138869
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.Peking Univ, Coll Chem & Mol Engn, Beijing 100871, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Lin, LW,Kou, Y,Zou, M,et al. An amorphous approach to the structure of a Pt-Fe/gamma-Al2O3 catalyst characterized by XAFS[J]. PHYSICAL CHEMISTRY CHEMICAL PHYSICS,2001,3(9):1789-1794.
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