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CO Oxidation Catalyzed by Pd-doped BaCeO3: Coexistence of Langmuir-Hinshelwood and BaCeO3-mediated Mechanisms

Published online by Cambridge University Press:  31 January 2011

Xiaoying Ouyang  and
Susannah Scott
Xiaoying Ouyang
Affiliation:
[email protected], University of California Santa Barbara, Chemistry and Biochemistry, Santa Barbara, California, United States
Susannah Scott
Affiliation:
[email protected], University of California Santa Barbara, Chemistry and Biochemistry, Santa Barbara, California, United States
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Abstract

The rate law for CO oxidation over Pd-substituted BaCeO3 was studied. Under CO-rich conditions over a range of pressures and temperatures, changing reaction orders for both CO and O2 suggest the coexistence of both Langmuir-Hinshelwood and BaCeO3-mediated mechanisms. The latter dominates at high P(CO)/P(O2), while both mechanisms contribute significantly at low P(CO)/P(O2). Under CO-lean conditions, the Langmuir-Hinshelwood mechanism dominates the kinetics. The importance of the BaCeO3-mediated mechanism increases with temperature. Steady-state isotopic transient kinetic analysis (SSITKA) using 18O2 confirmed the participation of labile lattice oxygen, thus BaCeO3 behaves as a BaO-stabilized form of CeO2.

Keywords

kineticsoxidePd
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 1217: Symposium Y – Catalytic Materials for Energy, Green Processes and Nanotechnology , 2009 , 1217-Y02-05
Copyright
Copyright © Materials Research Society 2010

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