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CATALYTIC OXIDATION OF DIMETHYL SULFIDE WITH OZONE: EFFECTS OF PROMOTER AND PHYSICO-CHEMICAL PROPERTIES OF METAL OXIDE CATALYSTS
Citation:
Gopal Devulapelli, V. AND E. SAHLE-DEMESSIE. CATALYTIC OXIDATION OF DIMETHYL SULFIDE WITH OZONE: EFFECTS OF PROMOTER AND PHYSICO-CHEMICAL PROPERTIES OF METAL OXIDE CATALYSTS. H.H. Kung, J.M. Lopez Nieto, K. Segawa, J.C. Vedrine, W. Ueda (ed.), APPLIED CATALYSIS A: GENERAL. Elsevier Science Ltd, New York, NY, 348(1):86-93, (2008).
Impact/Purpose:
Journal Article
Description:
This study reports improved catalytic activities and stabilities for the oxidation of dimethyl sulfide (DMS), a major pollutant of pulp and paper mills. Ozone was used as an oxidant and activities of Cu, Mo, Cr and Mn oxides, and mixed metal oxides supported on -alumina, were tested over the temperature ranging from 100-200°C. The best catalytic activity was obtained over 10wt% CuO-10wt% MoO3 supported on - Al2O3 with 100 % DMS conversion and high selectivity (96%) towards complete oxidation products such as CO2 and SO2. The addition of molybdenum to the CuO/-Al2O3 significantly enhanced the selectivity of the reaction towards complete oxidization products indicating that MoO3 acts as a good promoter when used with CuO. Catalyst characterization by XRD, TPR and NH3-TPD analyses suggested that these promoting effects are due to the formation of Cu3Mo2O9 and CuMoO4 species on CuO-MoO3/- Al2O3, and also a substantially higher quantity of acid sites and a stronger acid strength in CuO-MoO3/-Al2O3 than CuO/- Al2O3 catalyst. This study also reports the optimization of reaction parameters and effects the catalyst physico-chemical properties have on the catalytic activity.