Catalysts for lean NO x reduction: Structure-property relationship

M. C. Kung, K. A. Bethke, J. Yan, J. H. Lee, H. H. Kung

Research output: Contribution to journalArticle

48 Citations (Scopus)

Abstract

Effective reduction of NO x to N 2 using hydrocarbon in the presence of a high concentration of O 2 can be accomplished using Al 2 O 3 -supported Co, Ag, or Au catalysts. However, the maximum NO conversion to N 2 is higher on catalysts of lower metal loadings in the case of Co and Ag, which is due to the fact that the metal ions in these catalysts are more dispersed and more difficult to undergo redox than ions in catalysts of higher metal loadings. In the case of Au/Al 2 0 3 , the maximum NO conversion to N 2 depends on the crystallite size of Au. The effect of the presence of NO on the hydrocarbon oxidation reaction depends on the combustion activity of the catalysts: NO suppresses hydrocarbon combustion on more active combustion catalysts but facilitates it on less active ones.

Original languageEnglish
Pages (from-to)261-266
Number of pages6
JournalApplied Surface Science
Volume121-122
DOIs
Publication statusPublished - Nov 1997

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Keywords

  • Ag/alumina
  • Alumina-supported catalysts
  • Au/alumina
  • Co/alumina catalyst
  • Lean NO reduction
  • NO reduction

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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