Characterization by temperature-programmed reduction of non-conventional catalysts for hydrotreatment

被引：0

作者：

deLeon, SAG ^{[1
]}

Grange, P ^{[1
]}

Delmon, B ^{[1
]}

机构：

[1] UNITE CATALYSE & CHIM MAT DIVISES, B-1348 LOUVAIN, BELGIUM

来源：

CATALYSIS LETTERS | 1997年 / 47卷 / 01期

关键词：

hydrotreatment; TPR; noble metals; spillover hydrogen; Mo-Pt; W-Rh; W-Pd; mechanical mixtures;

D O I：

暂无

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：

A temperature-programmed reduction (TPR) study of three series of biphasic hydrotreating (HDT) catalysts - PtS/gamma Al2O3/(PtS/gamma-Al2O3 + MoS2); Rh2S3/gamma-AlOOH/(Rh2S3/gamma-AlOOH + WS2) and PdS/gamma-Al2O3/(PdS/gamma-Al2O3 + WS2) - is presented. In all cases, the quantity of H2S produced is larger than that which would correspond to the arithmetic addition of the quantities produced by each of the sulfide phases alone. This fact suggests that the noble metal sulfide dissociates the hydrogen molecule to spillover hydrogen (H-SO), the latter producing a deeper reduction of molybdenum sulfide or tungsten sulfide. The similitude of catalytic effect in hydrogenation (HYD) and hydrodesulfurization (HDS) observed with the same mechanical mixture strongly suggests that H-SO also plays a role in the synergy between MoS2 or WS2 and the noble metal sulfides.

引用

页码：51 / 55

页数：5