Stable and Efficient Pt-Re/TiO2 catalysts for Water-Gas-Shift: On the Effect of Rhenium

被引：29

作者：

Azzam, Khalid G. ^{[1
]}

Babich, Igor V. ^{[1
]}

Seshan, Kulathuiyer ^{[1
]}

Mojet, Barbara L. ^{[1
]}

Lefferts, Leon ^{[1
]}

机构：

[1] Univ Twente, MESA Inst Nanotechnol, Fac Sci & Technol, NL-7500 AE Enschede, Netherlands

来源：

CHEMCATCHEM | 2013年 / 5卷 / 02期

关键词：

adsorption; platinum; reduction; rhenium; titanium; water-gas-shift; PT-RE/AL2O3 REFORMING CATALYSTS; RAY-ABSORPTION-SPECTROSCOPY; FUEL-CELL APPLICATIONS; PT-RE; PT/TIO2; CATALYST; LOW-TEMPERATURE; METAL FUNCTION; PRETREATMENT; DISPERSION; REDUCTION;

D O I：

10.1002/cctc.201200492

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 catalytic performance of PtRe/TiO2 catalysts, that is, activity and stability, in single-stage water gas shift reactions was investigated by studying the influence of preparation strategies, Pt/Re molar ratios, and metals contents. Results show that sequential impregnation of Re precursor prior to Pt precursor without intermediate pretreatment is the optimum preparation strategy. The Pt/Re ratio of unity with 0.5wt.% Pt content resulted in the most significant effect on activity and stability. Insitu characterizing of both monometallic and the optimal bimetallic PtRe catalysts by means of CO chemisorption, H2 temperature programmed reduction, and FTIR spectroscopy under the reaction conditions provided evidence that Re increases the activity by enhancing the activation of water. No evidence was found for any direct influence of Re on the properties of Pt in the catalyst under the reaction conditions.

引用

页码：557 / 564

页数：8

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