Synergistic effect in lean NOx reduction by CH4 over Co/Al2O3 and H-zeolite catalysts

J. Y. Yan, H. H. Kung, W. M.H. Sachtler, M. C. Kung*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

107 Scopus citations


In the reduction of NO by CH4 in the presence of a large excess of oxygen, the conversion to N2 over a physical mixture of Co/Al2O3 and H-zeolite catalysts was found to be twice as high as that expected if these components acted independently. This synergistic effect was observed with both H-ZSM-5 and H-USY. By comparing the activities of these catalysts for NO oxidation and CH4 reduction of NO2, it was concluded that the synergistic effect could be explained by the participation of Co ions and proton sites in the reaction. NO is oxidized to NO2 over the Co ions, and NO2 is reduced by CH4 to N2 over the proton sites.

Original languageEnglish (US)
Article numberCA982012
Pages (from-to)294-301
Number of pages8
JournalJournal of Catalysis
Issue number2
StatePublished - 1998

ASJC Scopus subject areas

  • Catalysis
  • Physical and Theoretical Chemistry


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