The 5% CoO x /TiO2 catalyst, well-characterized earlier, consisting of complete CoTiO x overlayers on Co3O4 nano-particles (“Type A”) after calcination at 843 K but of clean Co3O4 particles (“Type B”) after a continuous wet oxidation of trichloroethylene (TCE) at 310 K forca. 6 h, has been used to investigate the influence of operating variables on the activity and the stability of the Type B Co3O4 particles during wet catalysis. At 310 K, the catalyst exhibited a 48% steady-state conversion with a transient behavior in activity up toca. 1 h on stream. As the reaction temperature increased, higher performances were achieved and the transient period disappeared, which might be due to easier decapsulation of the Type A Co3O4 particles at higher temperatures to form the Type B Co3O4 particles very active for this wet oxidation reaction. All wet activities were equal to those based on the concentration of Cl− ions produced, implying the complete oxidation of TCE to HCl and CO2, and significant decrease in pH occurred because of the HCl formation. The supported CoO x was very stable for the wet oxidation at 310 K, even forca. 36 h, and XPS measurements of samples of the catalyst following the wet oxidation for desired hours were in good agreement with our earlier proposed model for CoO x species.
Research on Chemical Intermediates – Springer Journals
Published: Apr 15, 2009
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