AN EXAFS STUDY OF THE MO/TIO2 HYDRODESULFURIZATION CATALYSIS

被引:10
作者
KULKARNI, GU [1 ]
RAO, CNR [1 ]
机构
[1] INDIAN INST SCI,SOLID STATE & STRUCT CHEM UNIT,BANGALORE 560012,KARNATAKA,INDIA
关键词
HDS CATALYSTS; MO/TIO2; CATALYST; MO/GAMMA-AL2O3;
D O I
10.1007/BF00866902
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
In-situ EXAFS studies of sulphided Mo/TiO2 catalysts have shown that at low Mo loadings (2-4 wt%), an active species with a short Mo-S distance of 2.25 angstrom is formed, while on Mo/TiO2 with high Mo loadings as well as on Mo/gamma-Al2O3, bulk MoS2 (Mo-S, 2.42 angstrom) is formed. The species with the short Mo-S distance has Mo in an oxidation state close to 6 + and is likely to result from the sulphidation of the tetrahedral molybdate species present in the oxidic precursor at low Mo loadings. The calcination temperature of the oxidic precursor appears crucial, a high calcination temperature of 973 K favouring the formation of MoS3 on sulphidation, and a low calcination temperature of 623 K favouring MoS2.
引用
收藏
页码:63 / 70
页数:8
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