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Kinetics and mechanism of low-temperature ozone decomposition by Co-ions adsorbed on silica |
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| Authors: | Tatiana L. Rakitskaya Alim A. Ennan Irina V. Granatyuk Alexander Yu. Bandurko Gilbert G. A. Balavoine Yurii V. Geletii V. Ya. Paina |
| Affiliation: | a Physical–Chemical Institute of Environment and Human Being Protection, Odessa State University, 2 Dvoryanskaya Street, Odessa-26, 270026 Ukraine b Laboratoire de Chimie de Coordination, CNRS, 205 Route de Narbonne, F-31077 Toulouse Cedex, France c Institute of Chemical Physics in Chernogolovka, RAN, Chernogolovka, 142432 Russia |
| Abstract: | Kinetics and mechanism of low-temperature ozone ((5–50) × 10−3 mol/m3 in the gas–air mixture) decomposition by Co-catalysts supported on silica have been studied. Co-ions adsorbed on silica react with surface oxygen species, thus resulting in an active catalyst. Low concentrations of Co-ions form a monolayer on the surface. Their specific catalytic activity remained constant, but sharply decreased at higher concentrations due to a formation of polynuclear Co-complexes. Ozone decomposition may occur either as a stoichiometric or catalytic process, depending on the ozone and catalyst concentrations. The turnover number increases with ozone concentration reaching a saturation point. It also increases with Co-concentration in the beginning, but drops at a concentration >1 × 10−4 mol/g. The mechanism of the reaction is discussed. |
| Keywords: | Catalysis: low-temperature Cobalt Ozone decomposition kinetics Silica |
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