IngentaConnect Wet oxidation of trichloroethylene over well-characterized CoOx/T...

Authors: Yang, Won-Ho¹; Kim, Moon Hyeon²

Source: Research on Chemical Intermediates, Volume 34, Numbers 8-9, 2008 , pp. 717-725(9)

Abstract:

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 for ca. 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 to ca. 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 for ca. 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.

Keywords: TRICHLOROETHYLENE; CONTINUOUS WET OXIDATION; SUPPORTED COBALT OXIDES; DURABILITY

Document Type: Research article

DOI: 10.1163/156856708786189186

Affiliations: 1: Department of Occupational Health, Catholic University of Daegu, 330 Geumnak, Hayang, Gyeongsan 712-702, South Korea 2: Department of Environmental Engineering, Daegu University, 15 Naeri, Jillyang, Gyeongsan 712-714, South Korea

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Wet oxidation of trichloroethylene over well-characterized CoOx/TiO2 catalysts

Wet oxidation of trichloroethylene over well-characterized CoO_x/TiO₂ catalysts