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An amorphous approach to the structure of a Pt-Fe/gamma-Al2O3 catalyst characterized by XAFS
Lin, LW; Kou, Y; Zou, M; Yan, Z
刊名PHYSICAL CHEMISTRY CHEMICAL PHYSICS
2001
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
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
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.
语种英语
WOS记录号WOS:000168035300037
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文献类型期刊论文
条目标识符http://cas-ir.dicp.ac.cn/handle/321008/138869
专题中国科学院大连化学物理研究所
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
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GB/T 7714
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.
APA Lin, LW,Kou, Y,Zou, M,&Yan, Z.(2001).An amorphous approach to the structure of a Pt-Fe/gamma-Al2O3 catalyst characterized by XAFS.PHYSICAL CHEMISTRY CHEMICAL PHYSICS,3(9),1789-1794.
MLA Lin, LW,et al."An amorphous approach to the structure of a Pt-Fe/gamma-Al2O3 catalyst characterized by XAFS".PHYSICAL CHEMISTRY CHEMICAL PHYSICS 3.9(2001):1789-1794.
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