Active carbon supported Mo-K catalysts used for alcohol synthesis

被引:48
|
作者
Li, ZR
Fu, YL [1 ]
Jiang, M
Hu, TD
Liu, T
Xie, YN
机构
[1] Univ Sci & Technol China, Dept Chem Phys, Hefei 230026, Peoples R China
[2] Chinese Acad Sci, Inst High Energy Phys, Beijing 100039, Peoples R China
基金
中国国家自然科学基金;
关键词
molybdenum-based catalysis; activated carbon support; alcohol synthesis; structure;
D O I
10.1006/jcat.2001.3172
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
The structure of oxidic and sulfided Mo catalysts supported on activated carbon was studied by means of X-ray diffraction (XRD), laser Raman spectroscopy (LRS), and extended X-ray absorption fine structure (EXAFS), The activity for mixed alcohol synthesis was also investigated. In oxidic state, the Mo phase on the sample with low Mo loading is mainly present as MoO2, due to the migration of the potassium anions into micropores of activated carbon and the reducing nature of activated carbon at a high preparation temperature. As the Mo loading increases, the interaction between potassium and molybdenum is enhanced. At the MoO3 loading of 72 wt%, Mo mainly exists in the form of K2Mo2O7 species. After sulfidation, the OS substitution takes place; the Mo sulfide phase is highly dispersed as tiny three-dimensional particles at higher loading. Indeed, the results of XRD, LRS, and EXAFS demonstrate that MoS2 is the major phase present after sulfidation, The higher catalytic activity for Mo-K/AC compared to Mo-K/Al2O3 is explained by the difference in the structure of sulfide phase and in the interaction between these phases and the respective supports. (C) 2001 Academic Press
引用
收藏
页码:155 / 161
页数:7
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