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

页码：163 / 171

页数：9

共 44 条

[1] Synthesis of platinum-tin/alumina reforming catalysts from a well-defined platinum-tin precursor complex [J].

Audo, C ;

Lambert, JF ;

Che, M ;

Didillon, B .

CATALYSIS TODAY, 2001, 65 (2-4) :157-162

[2] Bifunctional catalysts for single-stage water-gas shift reaction in fuel cell applications. Part 1. Effect of the support on the reaction sequence [J].

Azzam, K. G. ;

Babich, I. V. ;

Seshan, K. ;

Lefferts, L. .

JOURNAL OF CATALYSIS, 2007, 251 (01) :153-162

[3]

Bartholomew CH, 2006, FUNDAMENTALS OF INDUSTRIAL CATALYTIC PROCESSES, 2ND EDITION, P909

[4] Studies of the water-gas-shift reaction on ceria-supported Pt, Pd, and Rh: implications for oxygen-storage properties [J].

Bunluesin, T ;

Gorte, RJ ;

Graham, GW .

APPLIED CATALYSIS B-ENVIRONMENTAL, 1998, 15 (1-2) :107-114

[5] Adsorption on perfect and reduced surfaces of metal oxides [J].

Calatayud, M ;

Markovits, A ;

Menetrey, M ;

Mguig, B ;

Minot, C .

CATALYSIS TODAY, 2003, 85 (2-4) :125-143

[6] Trimetallic naphtha reforming catalysts.: I.: Properties of the metal function and influence of the order of addition of the metal precursors on Pt-Re-Sn/γ-Al2O3-Cl [J].

Carvalho, LS ;

Pieck, CL ;

Rangel, MC ;

Fígoli, NS ;

Grau, JM ;

Reyes, P ;

Parera, JM .

APPLIED CATALYSIS A-GENERAL, 2004, 269 (1-2) :91-103

[7] CONVERSION OF METHYLCYCLOPENTANE ON PLATINUM-TIN REFORMING CATALYSTS [J].

COQ, B ;

FIGUERAS, F .

JOURNAL OF CATALYSIS, 1984, 85 (01) :197-205

[8] CONVERSION OF N-HEXANE OVER MONO-FUNCTIONAL SUPPORTED AND UNSUPPORTED PTSN CATALYSTS [J].

DAUTZENBERG, FM ;

HELLE, JN ;

BILOEN, P ;

SACHTLER, WMH .

JOURNAL OF CATALYSIS, 1980, 63 (01) :119-128

[9] EXAFS STUDIES OF BIMETALLIC PT-RE/AL2O3 CATALYSTS [J].

DEXPERT, H ;

LAGARDE, P ;

BOURNONVILLE, JP .

JOURNAL OF MOLECULAR CATALYSIS, 1984, 25 (1-3) :347-355

[10] A novel catalyst for CO oxidation at low temperature [J].

Dong, GL ;

Wang, JG ;

Gao, YB ;

Chen, SY .

CATALYSIS LETTERS, 1999, 58 (01) :37-41

← 1 2 3 4 5 →