Changes in metal-sulfur bond energy in promoted and unpromoted molybdenum catalysts

被引：35

作者：

Nielsen, LP ^{[1
]}

Christensen, SV ^{[1
]}

Topsoe, H ^{[1
]}

Clausen, BS ^{[1
]}

机构：

[1] Haldor Topsoe Res Labs, DK-2800 Lyngby, Denmark

来源：

CATALYSIS LETTERS | 2000年 / 67卷 / 2-4期

关键词：

sulfur bond energy; molybdenum; TPS; TPR; EXAFS; Co-Mo-S; HDS;

D O I：

10.1023/A:1019090227019

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：

Insight into the changes in the metal-sulfur bond energy in unpromoted and promoted (Co, Ni, or Fe) MoS2 catalysts is obtained by temperature-programmed reduction (TPR) studies of in situ sulfided catalysts. The experiments reveal a significant decrease in the metal-sulfur bond energy for the more active Co-Mo-S and Ni-Mo-S structures as compared to MoS2. A similar decrease is not observed for the less active Fe-Mo-S structure. The sulfur coordination is directly measured by in situ EXAFS and the results support that one of the roles of the promoter atoms is to facilitate vacancy formation. The findings are in accord with recent density functional theory calculations.

引用

页码：81 / 85

页数：5

共 18 条

[1]

[Anonymous], HYDROTREATING CATALY

[2] TEMPERATURE-PROGRAMMED SULFIDING OF MOO3/AL2O3 CATALYSTS [J].