QEXAFS study of the sulfidation of NiMo/Al2O3 hydrotreating catalysts

被引：8
|
作者：
Cattaneo, R [1 ]
Shido, T [1 ]
Roel, P [1 ]
机构：
[1] Fed Inst Technol, ETH Zurich, Tech Chem Lab, CH-8092 Zurich, Switzerland
来源：
JOURNAL OF SYNCHROTRON RADIATION | 2001年 / 8卷
关键词：
QEXAFS; sulifidation; hydrotreating catalysts; nickel-molybdenum/alumina;
D O I：
10.1107/S0909049500020343
中图分类号：
TH7 [仪器、仪表];
学科分类号：
0804 ; 080401 ; 081102 ;
摘要：
Quick-scanning extended X-ray absorption fine structure (QEXAFS) spectroscopy was employed to investigate in situ the sulfidation of Mo and Ni in gamma -Al2O3-supported hydrotreating catalysts modified with chelating ligands. Mo K-edge QEXAFS enabled the detection of an intermediate product in the sulfidation of Mo. The parameters obtained from the fits of the QEXAFS spectra showed that this product consists of compounds similar to Mo2S122- or Mo3S132-. QEXAFS also demonstrated that the sulfidation of Ni is strongly influenced by the presence of chelating ligands. Classical EXAFS spectra of the sulfided catalysts showed that Ni forms small sulfided clusters, the size of which is influenced by the presence or absence of the chelating agents.
引用
收藏
页码：158 / 162
页数：5
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