An EXAFS study on oxidic and sulfided K-MoO3/gamma-Al2O3 catalysts
Bian, GZ; Fu, YL; Xie YN(谢亚宁); Xie, YN
刊名CATALYSIS LETTERS
1996
卷号40期号:3-4页码:#REF!
关键词K-MoO3/Al2O3 catalysts oxidic and sulfided states EXAFS structure
学科分类Chemistry
DOI10.1007/BF00815288
文章类型Article
英文摘要By analyzing the extended X-ray absorption fine structure (EXAFS) of the Mo K-absorption edge, structural information for both oxidic and sulfided K-MoO3/gamma-Al2O3 catalysts with different potassium content was obtained. The oxidic samples show two backscatterer peaks in the radial distribution function (RDF), which correspond to the Mo-O coordinations in the nearest Mo-O shell. The nearest oxygen atoms are present with large configurational disorder. The RDF for the K/Mo = 0 sample is significantly different from that for crystalline MoO3 and ammonium heptamolybdate. The RDFs for potassium promoted samples are, in some extent, similar to that for ammonium heptamolybdate. The sample with K/Mo = 0.8 and that with K/Mo = 1.5 do not show obvious difference in their local Mo-O structures. The EXAFS results support the earlier conclusions from Raman spectroscopy studies on identical samples [7]. When the samples are sulfided, a rearrangement of the local neighbors around Mo atoms takes place, to form small MoS2-like crystallites. The MoS and Mo-Mo coordination distances on these catalysts are the same as those in crystalline MoS2, but the coordination numbers are significantly lower than in MoS2. The EXAFS results indicate that Mo species on the K/Mo = 0 catalyst mainly consist of MoS-Mo units (the basic building units of MoS2), which are highly dispersed and show a higher level of disorder than in MoS2. With the modification by the potassium promoter, Mo species are significantly aggregated and their local neighbors are more similar to those in MoS2, but the Mo species still exist in a state of high dispersion.
类目[WOS]Chemistry, Physical
收录类别SCI
WOS记录号WOS:A1996VE92300017
引用统计
被引频次:4[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/227113
专题中国科学院高能物理研究所_多学科研究中心_期刊论文
中国科学院高能物理研究所_多学科研究中心
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GB/T 7714
Bian, GZ,Fu, YL,Xie YN,et al. An EXAFS study on oxidic and sulfided K-MoO3/gamma-Al2O3 catalysts[J]. CATALYSIS LETTERS,1996,40(3-4):#REF!.
APA Bian, GZ,Fu, YL,谢亚宁,&Xie, YN.(1996).An EXAFS study on oxidic and sulfided K-MoO3/gamma-Al2O3 catalysts.CATALYSIS LETTERS,40(3-4),#REF!.
MLA Bian, GZ,et al."An EXAFS study on oxidic and sulfided K-MoO3/gamma-Al2O3 catalysts".CATALYSIS LETTERS 40.3-4(1996):#REF!.
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