A wire microcalorimetric study of catalytic ignition of methane-air mixtures over palladium oxide

Taichang Zhang, Delin Zhu, Nan Yao, Fei Qi, Chung King Law

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

Catalytic ignition and heat release of methane oxidation over a Pd wire covered with a 1-2 μm PdO surface layer were investigated by wire microcalorimetry over the temperature range of 600-770 K and pressure range of 0.5-4 atm. Ignition temperatures and heat release rates for different methane concentrations (1-4 vol.% in dry air) were determined, showing that the ignition temperatures decrease with increasing the methane concentration and increasing ambient pressure. At total pressure of 1 atm and 2% methane concentration, the global activation energy for the catalytic reaction is 21.5 ± 0.9 kcal/mol and 14.3 ± 0.2 kcal/mol in the temperature ranges of 600-670 K and 670-770 K, respectively. The reaction order for methane is 0.9 ± 0.1 over the temperature range of 630-770 K.

Original languageEnglish (US)
Pages (from-to)1819-1825
Number of pages7
JournalProceedings of the Combustion Institute
Volume33
Issue number2
DOIs
StatePublished - Feb 3 2011

All Science Journal Classification (ASJC) codes

  • Chemical Engineering(all)
  • Mechanical Engineering
  • Physical and Theoretical Chemistry

Keywords

  • Catalytic oxidation
  • Kinetics
  • Methane
  • Palladium oxide

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