Catalytic low-temperature oxydehydrogenation of methane to higher hydrocarbons with very high selectivity at 8-12% conversion

J. Raskó, G. A. Somorjai, H. Heinemann

Research output: Contribution to journalArticle

20 Citations (Scopus)

Abstract

Oxydehydrogenative coupling of methane to higher hydrocarbons has been obtained with close to 100% selectivity at 600 °C and atmospheric pressure in the presence of steam over a CaNiK oxide catalyst. The reaction resulting in higher hydrocarbons is catalytic. Some carbon dioxide is produced thermally. The reaction is slightly exothermic. An Arrhenius plot shows that methane oxidation to carbon dioxide predominates at temperatures above 600 °C and oxydehydrogenation of methane is dominant at lower temperatures. Artifacts, such as carbonate formation on the catalyst, have been excluded. The importance of exact catalyst composition and activation and the effect of the composition of the feed are demonstrated. A mechanism of catalyst deactivation is proposed.

Original languageEnglish
Pages (from-to)57-75
Number of pages19
JournalApplied Catalysis A, General
Volume84
Issue number1
DOIs
Publication statusPublished - May 5 1992

Keywords

  • calcium-nickel-potassium
  • low-temperature oxydehydrogenation
  • methane dehydrogena- tion
  • selectivity (higher hydrocarbons).

ASJC Scopus subject areas

  • Catalysis
  • Process Chemistry and Technology

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