Promoting effect of Zr on the catalytic combustion of methane over Pd/γ-Al₂O₃ catalyst

Abstract

The effect of Zr on the catalytic performance of Pd/γ-Al₂O₃ for the methane combustion was investigated. The results show that the addition of Zr can improve the activity and stability of Pd/γ-Al₂O₃ catalyst, which, based on the catalyst characterization (N₂ adsorption, XRD, CO-Chemisorption, XPS, CH₄-TPR and O₂-TPO), is ascribed to the interaction between Pd and Zr. The active phase of methane combustion over supported palladium catalyst is the Pd⁰/Pd²⁺ mixture. Zr addition inhibits Pd aggregation and enhances the redox properties of active phase Pd⁰/ Pd²⁺. H₂ reduction could effectively reduce the oxidation degree of Pd species and regenerate the active sites (Pd⁰/ Pd²⁺).

Keywords

Pd-Zr/Al₂O₃ / methane / catalytic combustion / catalyst regeneration

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Acknowledgements

This research was supported by the National High Technology Research and Development Program of China (Nos. 2010AA064904 and 2012AA062702) and the National Natural Science Foundation of China (Grant No. 21177006).

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2014 Higher Education Press and Springer-Verlag Berlin Heidelberg