Journal
APPLIED CATALYSIS B-ENVIRONMENTAL
Volume 100, Issue 3-4, Pages 481-490Publisher
ELSEVIER
DOI: 10.1016/j.apcatb.2010.08.026
Keywords
Catalytic combustion; Combustion synthesis; Ionic catalysts; Redox couples; XPS; Dual site mechanism
Funding
- Bristol-Myers Squibb
- Department of Science and Technology
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Catalytic combustion of H-2 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 H-2-combustion and complete conversion was achieved below 200 C over all the catalysts when O-2 was used in a stoichiometric amount With higher amounts of O-2 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 H-2 with stoichiometric amount of O-2 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 pi posed for the reaction (C) 2010 Elsevier B V All rights reserved
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