A bifunctional catalyst for the single-stage water-gas shift reaction in fuel cell applications. Part 2. Roles of the support and promoter on catalyst activity and stability

被引：107
作者：
Azzam, K. G. [1 ]
Babich, I. V. [1 ]
Seshan, K. [1 ]
Lefferts, L. [1 ]
机构：
[1] Univ Twente, IMPACT, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands
来源：
JOURNAL OF CATALYSIS | 2007年 / 251卷 / 01期
关键词：
WGS reaction; platinum; rhenium; tin; oxide supports; activity; stability; deactivation;
D O I：
10.1016/j.jcat.2007.07.011
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 nature of oxide supports has a crucial effect on the performance of Pt-based catalysts in the water-gas shift reaction. Supports not only determine the activity of the catalyst, but also influence their stability (deactivation mechanism). Among the catalysts studied, Pt/TiO2 was the most active. Pt/CeO2 deactivated with time due to the formation of stable carbonate on the ceria surface. Sintering of Pt was found to be the cause of Pt/TiO2 deactivation. Using mixed oxides as catalyst supports did not improve the activity despite the better red-ox properties of mixed oxides compared with the single-oxide supports. Pt/TiO2 could be stabilized by adding a second metal (Re), which prevented Pt sintering. In addition, Pt-Re/TiO2 was more active than Pt/TiO2. Under WGS conditions, part of the Re was present in oxidizing form (ReOx); we speculate that this helped improve the catalyst activity. (c) 2007 Elsevier Inc. All rights reserved.
引用
收藏
页码：163 / 171
页数：9
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