Kinetic Investigation of the Photocatalytic Reduction of Nitric Oxide by Carbon Monoxide at Low Pressure on Silica-Supported Molybdenum Oxide |
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| Authors: | Lisachenko AA Chikhachev KS Zakharov MN Basov LL Shelimov BN Subbotina IR Che M Coluccia S |
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| Affiliation: | (1) Institute of Physics, St Petersburg State University, 198904 St Petersburg, Russia;(2) Laboratoire de Réactivité de Surface, UMR 7609, CNRS, Université Pierre et Marie Curie, 4 Place Jussieu, 75252 Paris Cedex 05, France;(3) Dipartimento di Chimica Inorganica, Chimica Fisica e Chimica dei Materiali, Università di Torino, Via Pietro Giuria 7, 10125 Torino, Italy |
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| Abstract: | The kinetics of photoinduced reactions that occur upon UV irradiation ( <360 nm) of a MoO3/SiO2 catalyst (2.5 wt% Mo) in CO-NO mixtures and CO alone are studied at gas pressures from 0.05 to 2 torr and for CO/NO ratios from 0.3 to 3.0 in the temperature interval 20-150C. The data obtained are consistent with a previously proposed two-stage redox mechanism. In the first stage NO is reduced to N2O through the reaction CO+2NO  CO2+N2O, while in the second stage the N2O formed is further reduced to N2 via the reaction CO+N2O CO2+N2. The ratio of rate constants for quenching of a transient excited state (Mo5+-O-)* by NO and CO molecules is found to be 2.8. The reaction rates decrease with increasing temperature, apparently because of a lower concentration of adsorbed species and/or a reduction of the steady-state concentration of (Mo5+-O-)*. |
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| Keywords: | NO CO MoOx/SiO2 reduction photocatalysis kinetics |
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