Performance of silicon‐carbide foams as supports for Pd‐based methane combustion catalysts |
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Authors: | Pablo Marín Salvador Ordóñez Fernando V Díez |
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Affiliation: | Department of Chemical Engineering and Environmental Technology, University of Oviedo, Facultad de Química, Julián Clavería 8, Oviedo 33006, Spain |
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Abstract: | BACKGROUND: Cellular foam materials are a new type of catalyst support that provides improved mass and heat transport characteristics and similar pressure drops to other well‐established structured supports such as monoliths. RESULTS: A Pd‐based catalyst has been prepared using a moderate surface area (25 m2 g?1) β‐SiC foam support without further washcoating. The stability of this catalyst has been tested for methane combustion at lean conditions, showing a small decrease of activity during the first 10 h followed by stable performance. Characterization of fresh and aged catalyst shows no significant changes. The influence of the most important reaction conditions, such as reactor loading (0.25–1 g), temperature (300–550 °C) and inlet methane concentration (833 and 1724 ppm), was studied in a fixed‐bed reactor. The results were fitted to three kinetic models: Mars‐van Krevelen; Langmuir‐Hinselwood; power‐law kinetics. CONCLUSIONS: The Pd/β‐SiC foam catalyst, prepared without the previous addition of a washcoating has been demonstrated to be stable for the combustion of methane‐air lean mixtures. A Mars‐van Krevelen kinetic model provides the best fit to the results obtained. Copyright © 2011 Society of Chemical Industry |
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Keywords: | cellular foam silicon carbide kinetic modeling catalytic combustion low‐temperature burners |
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