EXAFS study of γ-Mo2N and Mo nitrides supported on zeolites

被引：17

作者：

Liu, ZL

Meng, M

Fu, YL ^{[1
]}

Jiang, M

Hu, TD

Xie, YN

Liu, T

机构：

[1] Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Anhui, Peoples R China

[2] Acad Sinica, Inst High Energy Phys, Beijing 100039, Peoples R China

来源：

MATERIALS LETTERS | 2002年 / 54卷 / 5-6期

基金：

中国国家自然科学基金;

关键词：

zeolite supports; molybdenum nitride catalysts; EXAFS (X-ray absorption fine structure); structure;

D O I：

10.1016/S0167-577X(01)00595-X

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

By analysis of the extended X-ray absorption fine structure (EXAFS) of the Mo K-absorption edge, the structural information of both oxidic and nitrided Mo catalysts supported on zeolites was obtained. The supported MoO3 samples show three peaks in the radial structure function (RSF). The first two peaks represent the nearest Mo-O coordination shell and the ratio of the first peak to the second one is much larger than that of the MoO3 crystallites, which suggests that the MoO3 supported on zeolites has a compact structure than the unsupported one. Three peaks on the RSF Of gamma-Mo2N represent one Mo-N and two Mo-Mo coordination shells, respectively. This is in good agreement with the face-centered cubic model. Calculation from X-ray diffraction data and EXAFS spectra reveals that the N atoms in gamma-Mo2N lengthen the distance between Mo atoms and weaken the Mo-Mo bond. Supported Mo2N samples give out nearly the same RSFs as the gamma-Mo2N and only the peak corresponding to Mo-N shell is weak. This suggests the supported Mo2N has more configurational disorder. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：364 / 371

页数：8

共 19 条

[1] CATALYTIC HYDROTREATING OF INDOLE, BENZOTHIOPHENE, AND BENZOFURAN OVER MO2N [J].