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Study of Catalytic Methane Oxidation Over Pd Supported on Nanocrystalline CeO2: Effects of Calcination and Pd Loading

Published online by Cambridge University Press:  21 March 2011

Seung H. Oh ,
Michael L. Everett ,
Gar B. Hoflund ,
Johannes Seydel  and
Horst W. Hahn
Seung H. Oh
Affiliation:
Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
Michael L. Everett
Affiliation:
Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
Gar B. Hoflund
Affiliation:
Department of Chemical Engineering, University of Florida, Gainesville, FL 32611, USA
Johannes Seydel
Affiliation:
Darmstadt University of Technology, FB 21-Materials Science Department, Thin Film Division, Petersenstrasse 23, 64287 Darmstadt, GERMANY
Horst W. Hahn
Affiliation:
Darmstadt University of Technology, FB 21-Materials Science Department, Thin Film Division, Petersenstrasse 23, 64287 Darmstadt, GERMANY
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Abstract

The catalytic oxidation of methane was studied over palladium supported on nanocrystalline ceria. Three palladium weight loadings (1, 5, and 10 wt%) were tested after calcining at 500 °C, at 280 °C and after no calcination at all. For the 5 and 10 wt% loadings, the 280 °C-calcined and non-calcined catalysts exhibit enhanced activity after several heating and cooling cycles. Calcining these same catalysts at 500 °C results in a systematic decline in activity. For all pretreatments the 1 wt% Pd catalyst exhibits decreasing activity. For the 5 and 10 wt% Pd loadings, the non-calcined catalysts are more active than the 280 °C-calcined catalysts, which are more active than the 500 °C-calcined catalysts. For the 1 wt% Pd catalyst, the opposite is true. The catalyst activity improves as the Pd loading is increased.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 676: Symposium Y – Synthesis, Functional Properties and Applications of Nanostructures , 2001 , Y4.6
Copyright
Copyright © Materials Research Society 2001

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References

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