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Catalytic hydrogen combustion for treatment of combustible gases from fuel cell processors

Paper ID Volume ID Publish Year Pages File Format Full-Text
47030 46456 2010 10 PDF Available
Title
Catalytic hydrogen combustion for treatment of combustible gases from fuel cell processors
Abstract

Catalytic combustion of H2 was carried out over combustion synthesized noble metal (Pd or Pt) ion-substituted CeO2 based catalysts using a feed stream that simulated exhaust gases from a fuel cell processor. The catalysts showed a high activity for H2-combustion and complete conversion was achieved below 200 °C over all the catalysts when O2 was used in a stoichiometric amount. With higher amounts of O2, the reaction rates increased and complete conversions were possible below 100 °C. The reaction was also carried out over Pd-impregnated CeO2. The conversions of H2 with stoichiometric amount of O2 were found to be higher over Pd-substituted compound. The mechanism of the reaction over noble metal-substituted compounds was proposed on the basis of X-ray photoelectron spectroscopy studies. The redox couples between Ce and metal ions were established and a dual site redox mechanism was proposed for the reaction.

Research highlights▶ Pd and Pt ion-substituted CeO2 catalysts were synthesized. Catalytic combustion of H2 was carried out over these catalysts. ▶ Complete conversion was achieved below 100 °C. The reaction mechanism was proposed on the basis of XPS studies. ▶ A dual site redox mechanism was proposed for the reaction.

Keywords
Catalytic combustion; Combustion synthesis; Ionic catalysts; Redox couples; XPS; Dual site mechanism
First Page Preview
Catalytic hydrogen combustion for treatment of combustible gases from fuel cell processors
Publisher
Database: Elsevier - ScienceDirect
Journal: Applied Catalysis B: Environmental - Volume 100, Issues 3–4, 20 October 2010, Pages 481–490
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis