On the reaction mechanism for methane partial oxidation over yttria/zirconia

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Steghuis, A.G. and Ommen, J.G. van and Lercher, J.A. (1998) On the reaction mechanism for methane partial oxidation over yttria/zirconia. Catalysis Today, 46 (2-3). pp. 91-97. ISSN 0920-5861

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Abstract:Oxidation of methane over yttria/zirconia mixed oxide shows two parallel oxidation pathways, i.e. partial oxidation to CO+H2+H2O and full oxidation to CO2+2H2O. Both reactions proceed via a Mars van Krevelen mechanism with first order kinetics for methane and oxygen and are retarded by water. A mechanism is suggested in which methane is homolitically dissociated over O−(s) sites and via the formation and decomposition of a formaldehyde precursor reacted to CO, H2 and H2O. In parallel, CO2 is obtained from decomposition of bicarbonate that is formed via further oxidation of dioxymethylene.
Item Type:Article
Copyright:© 1998 Elsevier
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Link to this item:http://purl.utwente.nl/publications/73903
Official URL:http://dx.doi.org/10.1016/S0920-5861(98)00330-7
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