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A comparative study of nanosized IB/ceria catalysts for low-temperature water-gas shift reaction

Paper ID Volume ID Publish Year Pages File Format Full-Text
44257 46011 2006 17 PDF Available
Title
A comparative study of nanosized IB/ceria catalysts for low-temperature water-gas shift reaction
Abstract

The water-gas shift (WGS) activity of different M/ceria catalysts, where M is a metal from IB group (i.e. Au, Ag, Cu) has been studied. Two different techniques were used for the preparation of the catalysts—deposition–precipitation and a modified version of deposition–precipitation. HRTEM combined with EDS, X-ray diffraction, FT-IR of the molecules involved in the WGS reaction at 90 and 300 K as well as of forward and reverse WGS reaction up to 573 K, XPS and H2-TPR were employed to obtain information about the effect of different synthesis procedures on the surface and on the bulk structure of the catalysts and to explain the differences observed in the catalytic activity. The influence of each IB metal on the WGS activity has been investigated, too. The experimental results revealed that deposition–precipitation is the preferred method for preparation of active ceria-based catalysts because it allowed most part of IB metal promoters to be exposed at the catalyst surface. WGS reaction proceeds at the boundary between nanosized metallic particles and ceria, where CO adsorption on IB metals and H2O dissociation on oxygen-vacancy defects of ceria take place. The role of formate species as intermediates in the WGS reaction is confirmed by FT-IR spectroscopy. The correlation between the stability of formates and the WGS activity suggests that the decomposition of formates is a rate-limiting step.

Keywords
Gold catalysts; Copper; Silver; Ceria; WGSR; FT-IR spectroscopy; HRTEM; XPS; TPR
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A comparative study of nanosized IB/ceria catalysts for low-temperature water-gas shift reaction
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 298, 10 January 2006, Pages 127–143
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
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Full-text PDF Download
Online Support
Any Questions? feel free to contact us