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The Role of [M+O−] Centers (M+– Group IA Ion) in the Activation of Methane on Metal Oxides

Published online by Cambridge University Press:  28 February 2011

J. H. Lunsford ,
C.-H. Lin ,
J.-X. Wang  and
K. D. Campbell
J. H. Lunsford
Affiliation:
Department of Chemistry Texas A & M University College Station, Texas 77843
C.-H. Lin
Affiliation:
Department of Chemistry Texas A & M University College Station, Texas 77843
J.-X. Wang
Affiliation:
Department of Chemistry Texas A & M University College Station, Texas 77843
K. D. Campbell
Affiliation:
Department of Chemistry Texas A & M University College Station, Texas 77843
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Abstract

If the ionic radii are compatible, alkali metal ions will substitute for the divalent metal ions in magnesium oxide, calcium oxide and zinc oxide. At high temperatures in the presence of molecular oxygen, centers of the type [M+O−] are formed, where MM+– Group IA ion. The O− ions in equilibrium with these centers are effective in H” abstraction from CH4, which is the first step in the oxidative dimerization reaction. At reaction temperatures >720°C alkali metal oxides formed on the catalytic surface may themselves become active centers. Alkali metal carbonates also may inhibit the activity of the host oxide and sinter the oxide, thereby eliminating corner sites which result in complete oxidation.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 111: Symposium O – Microstructure and Properties of Catalysts , 1987 , 305
Copyright
Copyright © Materials Research Society 1988

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