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Characterization of a Pt/TiO2 (rutile) catalyst for water gas shift reaction at low-temperature

Paper ID Volume ID Publish Year Pages File Format Full-Text
44259 46011 2006 9 PDF Available
Title
Characterization of a Pt/TiO2 (rutile) catalyst for water gas shift reaction at low-temperature
Abstract

Recently, we have reported that the Pt/TiO2 (R: rutile) catalyst has relatively high activity for the water gas shift reaction at low-temperature (LT-WGS). In this study, Pt catalysts supported on TiO2 (R), TiO2 (A: anatase), ZrO2 and Al2O3, were characterized by TEM, XPS, TPD, and FT-IR measurements. These results suggested detailed reasons for the high catalytic activity of the Pt/TiO2 (R) catalyst. TEM micrographs showed that the Pt dispersion of the Pt/TiO2 (R) catalyst was lower than those of the Pt/ZrO2 and Pt/Al2O3 catalysts, although Pt/TiO2 (R) had superior catalytic activity. Furthermore, the Pt/TiO2 (R) catalyst had larger Pt dispersion than Pt/TiO2 (A), although Pt/TiO2 (R) had lower BET surface area than Pt/TiO2 (A). XPS spectra indicated that the TiO2 (R and A) supports had a stronger electronic effect with Pt than ZrO2 and Al2O3. In addition, CO-TPD profiles revealed that the strength of Pt–CO bonding on Pt/TiO2 (R) and Pt/TiO2 (A) catalysts was weakened due to the interaction between the support and Pt. These results indicated that the catalytic activity of Pt catalysts for LT-WGS is greatly affected by the interaction between the support and Pt, rather than by Pt dispersion, although the difference in catalytic activity between the Pt/TiO2 (R) and Pt/TiO2 (A) catalysts can mainly be explained by the degree of Pt dispersion.Finally, IR spectra of CO–H2O and –D2O reactions on the Pt catalysts indicated that the high catalytic activity of Pt/TiO2 (R) could be attributed to the fast formation and decomposition of formate as a reaction intermediate.

Keywords
Water gas shift; Pt/TiO2 (rutile); Surface hydroxyls; Adsorbed CO species; Bidentate formate
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Characterization of a Pt/TiO2 (rutile) catalyst for water gas shift reaction at low-temperature
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 298, 10 January 2006, Pages 152–160
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
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us