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

A.G. Steghuis, A.G. Steghuis, J.G. van Ommen, J.A. Lercher

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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.
Original languageUndefined
Pages (from-to)91-97
Number of pages7
JournalCatalysis today
Volume46
Issue number46
DOIs
Publication statusPublished - 1998

Keywords

  • METIS-105557
  • IR-73903
  • Kinetics
  • Yttria/zirconia
  • Methane partial oxidation
  • Methane pulse

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