THE REDUCTION BEHAVIOR OF MO/TIO2-AL2O3 CATALYST

被引：14

作者：

WEI, ZB

JIANG, SC

XIN, Q

SHENG, SS

XIENG, GX

机构：

[1] National Laboratory for Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian

来源：

CATALYSIS LETTERS | 1991年 / 11卷 / 3-6期

关键词：

TIO2-AL2O3; MO/AL2O3; MO/TIO2-AL2O3; TEMPERATURE PROGRAMMED REDUCTION (TPR); X-RAY PHOTOELECTRON SPECTROSCOPY (XPS);

D O I：

10.1007/BF00764329

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 effect of TiO2 modified Al2O3 surface on the reducibility of MoO3 has been studied by TPR and XPS. The results show that Mo6+ in Mo/TiO2-Al2O3 can be reduced to much lower valency, especially at low Mo loading. The influence of the calcination temperature on the reduction of Mo6+ on Al2O3 and TiO2-Al2O3 Carriers is different. The data reveals that the reducibility of Mo6+ on Al2O3 slightly decreased, while that on TiO2-Al2O3 increased when the calcination temperature was raised. It is suggested that the stronger tetrahedral site of the Al2O3 surface was first occupied by TiO2 and main octahedral Mo6+ in polymeric species-; and a small crystalline MoO3 formed on TiO2-Al2O3, whereas the formation of tetrahedral Mo6+ species and Al2(MoO4)3 phase was inhibited.

引用

页码：365 / 374

页数：10

共 17 条

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