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 |
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Authors: | 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. |
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