Formation Mechanism of O2– Radical Anions in the Adsorption of NO + O2 and NO2 + O2 Mixtures on ZrO2 According to EPR and TPD Data |
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| Authors: | A N Il'ichev G A Konin V A Matyshak A M Kuli-zade V N Korchak Yu B Yan |
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| Institution: | (1) Semenov Institute of Chemical Physics, Russian Academy of Sciences, Moscow, Russia;(2) Institute of Marine Geology and Geophysics, Far East Division, Russian Academy of Sciences, Yuzhno-Sakhalinsk, Russia |
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| Abstract: | The effects of various factors on the formation of O2
– radical anions in the adsorption of an NO + O2 or NO2 + O2 mixture on ZrO2 were studied. It was found that the thermal stability of the O2
– species depends on the composition of the adsorbed gas. It was suggested that nitrogen oxide complexes on ZrO2 centers are responsible for the formation of O2
–. These centers are formed upon the treatment of the oxide in a vacuum; however, they are different from both coordinatively unsaturated Zr4+ cations (NO adsorption centers at 77 K) and Zr4+–O––O––Zr4+ centers, at which O2
– are formed because of the adsorption of H2 + O2. Based on the experimental data, the mechanism of O2
– formation in the adsorption of an NO + O2 mixture is discussed. |
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