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Issue 12, 2007
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Catalytic partial oxidation of methane to synthesis gas over a ruthenium catalyst: the role of the oxidation state

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Abstract

The catalytic partial oxidation of methane to synthesis gas over ruthenium catalysts was investigated by thermogravimetry coupled with infrared spectroscopy (TGA-FTIR) and in situ X-ray absorption spectroscopy (XAS). It was found that the oxidation state of the catalyst influences the product formation. On oxidized ruthenium sites, carbon dioxide was formed. The reduced catalyst yielded carbon monoxide as a product. The influence of the temperature was also investigated. At temperatures below the ignition point of the reaction, the catalyst was in an oxidized state. At temperatures above the ignition point, the catalyst was reduced. This was also confirmed by the in situ XAS spectroscopy. The results indicate that both a direct reaction mechanism as well as a combustion-reforming mechanism can occur. The importance of knowing the oxidation state of the surface is discussed and a method to determine it under reaction conditions is presented.

Graphical abstract: Catalytic partial oxidation of methane to synthesis gas over a ruthenium catalyst: the role of the oxidation state

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Article information


Submitted
01 Dec 2006
Accepted
24 Jan 2007
First published
19 Feb 2007

Phys. Chem. Chem. Phys., 2007,9, 1461-1468
Article type
Paper

Catalytic partial oxidation of methane to synthesis gas over a ruthenium catalyst: the role of the oxidation state

S. Rabe, M. Nachtegaal and F. Vogel, Phys. Chem. Chem. Phys., 2007, 9, 1461
DOI: 10.1039/B617529E

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