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Low-temperature combustion of methane using PdO/Al2O3 catalyst: Influence of crystalline phase of Al2O3 support

Paper ID Volume ID Publish Year Pages File Format Full-Text
49449 46745 2014 7 PDF Available
Title
Low-temperature combustion of methane using PdO/Al2O3 catalyst: Influence of crystalline phase of Al2O3 support
Abstract

•We examine the effect of the crystalline phase of Al2O3.•PdO/θ-Al2O3 exhibits the highest methane conversion.•The deactivation is attributed to the hydroxyl accumulation on the catalyst.•Catalytic performance is correlated with the reducibility and the oxygen capacity.

Palladium oxide (PdO) catalysts supported on various alumina supports (θ-, δ-, κ-, η-, and γ-Al2O3) were prepared and the effect of the crystalline phases of the supports on the catalytic performance in methane combustion was investigated. Among the catalysts examined, the PdO/θ-Al2O3 catalyst, which showed the lowest reduction temperature in the temperature-programmed reduction of methane and the highest oxygen capacity in methane pulse experiments, exhibited the highest CH4 conversion and stability for methane combustion. However, all the catalysts were deactivated because of the growth of PdO particles and strong adsorption of water vapor.

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Keywords
Methane combustion; Alumina support; Crystalline phase; H2O desorption; Deactivation
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Publisher
Database: Elsevier - ScienceDirect
Journal: Catalysis Communications - Volume 56, 5 November 2014, Pages 157–163
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Catalysis
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Price was $35.95
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