Deoderization of Sulfur Compounds by Oxidation with Platinum Catalysts

Abstract

Deoderization of sulfur compounds by catalytic oxidation was carried out by a flow system with a fixed bed. Kinetics of the reaction and the activities of catalysts were studied with platinum catalysts supported on r-alumina in three forms ; granular Pt-Al₂0₃, honeycomb-shaped Pt-A1₂O₃ and aluminum tubular Pt-A1₂O₃, in the temperature range of 200-300°c. Thiophene was used as a main sulfur compound in low concentration range in order to examine the effect of the deoderization. For each catalyst the rate of the thiophene oxidation was zero order to the thiophene con-centration and the apparent activation energy was 16 kcal/mol. The activity of the honeycomb-shaped catalyst was the highest of the three catalysts. When the honeycomb-shaped catalyst was cut into halves and these were stacked upon each other, the activity was greatly higher than that of the original one-step honeycomb-shaped catalyst. The activity of the aluminum tubular catalyst was the lowest of the three catalysts, but the effect of the stack was obser-ved, as well as in the case of honeycomb-shaped catalyst. Furthermore, the order of activities of the three catalysts for the oxidation of dimethyl sulfide and diethyl sulfide was the same as for the oxidation of thiophene.