Nature of the vanadia-ceria interface in V5+/CeO2 catalysts and its relevance for the solid-state reaction toward CeVO4 and catalytic properties

被引：141

作者：

Martínez-Huerta, MV

Coronado, JM

Fernández-García, M

Iglesias-Juez, A

Deo, G

Fierro, JLG

Bañares, MA

机构：

[1] CSIC, Inst Catalisis & Petroleoquim, E-28049 Madrid, Spain

[2] Indian Inst Technol, Dept Chem Engn, Kanpur 208016, Uttar Pradesh, India

来源：

JOURNAL OF CATALYSIS | 2004年 / 225卷 / 01期

关键词：

in situ; Raman; XANES; EPR; vanadia; ceria; solid-state reaction; CeVO4; vanadate;

D O I：

10.1016/j.jcat.2004.04.005

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 combination of in situ Raman, XANES, and EPR spectroscopies is used to study the nature of the interaction between V and Ce in the ceria-supported vanadia catalysts. Vanadium oxide species disperse on ceria up to 9 V atoms/nm(2) of support. Surface V5+ species closely interacts with ceria support promoting a reduction of surface Ce4+ to Ce3+. Upon heating or during reaction surface vanadia reacts with ceria support forming a CeVO4 phase. The active site appears to be V5+-O-Ce3+ for both systems. The redox cycle for oxidative dehydrogenation appears to be associated with Ce, rather than with V sites. (C) 2004 Elsevier lnc. All rights reserved.

引用

页码：240 / 248

页数：9