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Catalytic partial oxidation of methane over Pt/ceria-doped catalysts: Effect of ionic conductivity

Paper ID Volume ID Publish Year Pages File Format Full-Text
44023 46000 2006 7 PDF Available
Title
Catalytic partial oxidation of methane over Pt/ceria-doped catalysts: Effect of ionic conductivity
Abstract

Catalyst deactivation due to carbon deposition during the production of hydrogen rich synthesis gas has proven to be a major impediment in hydrocarbon fuel reforming. Several Pt-deposited catalysts were prepared and tested to study the role of ionic conductivity of the support material upon which they were deposited. Ceria-based supports used in this work were synthesized by a hydrothermal method and the catalysts were prepared by Pt addition (1 wt.%). Characterization of ceria-based supports included composition, surface area, crystal phases, reducibility and ionic conductivity. In order to study the influence of ionic conductivity on carbon deposition, Pt/(Ce0.56Zr0.44)O2−x, Pt/(Ce0.91Gd0.09)O2−x, Pt/(Ce0.71Gd0.29)O2−x and Pt/CeO2 were utilized as catalysts in the conversion of methane to syn-gas at varying oxygen-to-carbon ratios. Carbon content on the catalysts measured post-test revealed that the gadolinium-doped catalysts generated less carbon deposition between the catalysts tested. Stability tests of Pt/ceria-based catalysts showed stable performance during a 24 h reaction period. In order to compare carbon formation by oxygen ion conducting and non-oxygen ion conducting catalysts, the partial oxidation of methane was carried out over Pt/γ-Al2O3 and Pt/(Ce0.71Gd0.29)O2−x. Interestingly, the CH4 conversion for both materials was comparable. However, the amount of carbon deposited on Pt/(Ce0.71Gd0.29)O2−x was observed to be much less than on the alumina-supported Pt catalyst.

Keywords
Ceria; Platinum; Ionic conductivity; Alumina; Partial oxidation of methane
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Catalytic partial oxidation of methane over Pt/ceria-doped catalysts: Effect of ionic conductivity
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Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis A: General - Volume 310, 17 August 2006, Pages 54–60
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