Kinetics of catalytic oxidation of ethylene over palladium oxide

Y. X. Xin, B. Yang, H. Wang, S. L. Anderson, Chung King Law

Research output: Contribution to journalConference article

5 Scopus citations

Abstract

Catalytic oxidation of ethylene was experimentally studied by wire microcalorimetry and mass spectrometry over the temperature range of 400-800 K at atmospheric pressure. The catalyst is a palladium oxide (PdO) surface on a polycrystalline palladium wire. For mixtures containing 0.3-0.6% C2H4 and 3.75% O2 in N2, the heat release rate as well as the mole fractions of gas-phase species were identified. Experimental observation revealed the temperature-dependent channels for the C2H4 oxidation, with mixed H2 release and H2O production below 580 K and complete oxidation to CO2 and H2O above 600 K. Analysis of the global reaction kinetics shows that for 620 ≤ T (K) ≤ 740 K the surface catalytic reaction rate is the first order in ethylene concentration and has an activation energy of 48.2± 1.4 kJ/mol. A surface chemistry model is proposed and the dissociative adsorption rate constant of C2H4 on PdO surface was determined by fitting the experimental data.

Original languageEnglish (US)
Pages (from-to)2233-2240
Number of pages8
JournalProceedings of the Combustion Institute
Volume35
Issue number2
DOIs
StatePublished - Jan 1 2015
Event30th International Symposium on Combustion - Chicago, IL, United States
Duration: Jul 25 2004Jul 30 2004

All Science Journal Classification (ASJC) codes

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

Keywords

  • Catalytic oxidation
  • Ethylene combustion
  • Pd-based catalyst
  • Surface chemistry

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