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Molecules 2013, 18(7), 8289-8297; doi:10.3390/molecules18078289
Article

Enhanced Stability of CaO and/or La2O3 Promoted Pd/Al2O3 Egg-Shell Catalysts in Partial Oxidation of Methane to Syngas

1, 1, 2,*  and 1,*
1 Ningbo Institute of Materials Technology & Engineering, Chinese Academy of Sciences, Ningbo 315201, China 2 Shanghai Key Laboratory of Atmospheric Particle Pollution and Prevention (LAP3), Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
* Authors to whom correspondence should be addressed.
Received: 17 June 2013 / Revised: 5 July 2013 / Accepted: 9 July 2013 / Published: 15 July 2013
(This article belongs to the Special Issue Palladium Catalysts)
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Abstract

An egg-shell Pd/Al2O3 catalyst showed higher activity than a regular Pd/Al2O3 catalyst in the partial oxidation of methane to syngas, but a common problem of this reaction is the catalyst deactivation on stream. We attempted to modify the egg-shell catalyst via impregnation with some metal oxide additives. Although the addition of MgO did not show any beneficial effect, the addition of CaO and/or La2O3 significantly improved the stability due to the suppression of carbon deposition and phase transformation of the Al2O3 support. The catalysts were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, and thermogravimetric analysis (TGA).
Keywords: palladium catalysts; egg-shell catalyst; partial oxidation of methane; syngas palladium catalysts; egg-shell catalyst; partial oxidation of methane; syngas
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Wang, J.; Yu, H.; Ma, Z.; Zhou, S. Enhanced Stability of CaO and/or La2O3 Promoted Pd/Al2O3 Egg-Shell Catalysts in Partial Oxidation of Methane to Syngas. Molecules 2013, 18, 8289-8297.

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