On the properties of surface complexes formed upon the adsorption of NOx, C3H6, and their mixtures with oxygen on ZrO2 according to EPR, TPD, and fourier transform IR spectroscopy data

V. A. Matyshak, A. N. Il’ichev, O. N. Sil’chenkova, V. A. Sadykov, V. N. Korchaka

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Abstract

The adsorption of reactant mixtures is quantitatively and qualitatively different from the adsorption of the individual reactants. Thus, O2 is almost not adsorbed on ZrO2; however, a considerable concentration of molecular oxygen was detected among the products of desorption after the adsorption of a mixture of NO + O2 and the total amount of desorbed molecules was greater by a factor of 10 than their total amount after the individual adsorption of NO and O2. Among the qualitative differences is the formation of the O2 - radical anion on the surface only upon the adsorption of the mixture of NO + O2. Similarly, the number of desorbed molecules upon the simultaneous adsorption of C3H6, NO, and O2 was much greater than that upon their individual adsorption; this is related to the formation of paramagnetic and nonparamagnetic NO2–hydrocarbon complexes on the surface, which contained the NO2 group and a hydrocarbon fragment.

Original languageEnglish
Pages (from-to)677-685
Number of pages9
JournalKinetics and Catalysis
Volume57
Issue number5
DOIs
Publication statusPublished - 1 Sep 2016

Keywords

  • adsorption of NO
  • and their mixtures with O
  • CH
  • properties of surface complexes
  • selective catalytic reduction of NO
  • zirconium dioxide catalysts

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