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

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

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
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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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