Some problems on environmental catalysis

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Abstract

In order to optimise the catalytic processes involving NOx abatement and total combustion of volatile organic compounds (VOC), it is prerequisite to elucidate the mechanism of these processes. In the lecture three processes will be discussed. Atomic level approach will be applied to study NO+NH3 reaction on Pt foil to form N2 and H2O. The reaction is accelerated by adding trace amount of oxygen. In certain pressure and temperature range an oscillation commences. The problem is discussed in terms of the special composition of the surface species. The NO decomposition was studied over Cu-ZSM-5 catalysts prepared by ion exchange and solid state exchange methods. Transient kinetic studies and FTIR measurements indicated the presence of excess oxygen on the surface which is involved in the formation of Cu2+(O)(NO)(NO2) species. These intermediates play a key role in the NO decomposition. Total combustion of m-xylene was studied over palladium catalysts in various forms (amorphous alloys, deposited over clinoptilolite and over stainless steel flakes). Low/high activity states were observed due to the different oxidation states of palladium measured by XPS method. Homogeneous chain reaction initiated by the catalyst surface was found to be responsible for the high activity state and involvement of the surface carbon was the key issue in the self-sustained and damped oscillations.

Original languageEnglish
Pages (from-to)69-80
Number of pages12
JournalStudies in Surface Science and Catalysis
Volume113
DOIs
Publication statusPublished - 1998

Keywords

  • M-xylene total combustion
  • NO decomposition
  • NO+NH reaction

ASJC Scopus subject areas

  • Catalysis
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

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