Catalytic oxidation of dimethyl sulfide with ozone and the effect of promoter and physico-chemical properties of metal oxide catalysts

ENVR 122

Venugopal Devulapelli, gopal.venu@epa.gov, National Risk Management Research Laboratory, U.S. EPA, 26 W. M. L. King Dr, MS 443, Cincinnati, OH 45268 and E. Sahle-Demessie, sahle-demessie.endalkachew@epamail.epa.gov, Sustainable Technology Division, U.S. EPA, ORD, National Risk Management Research Lab, 26 W. Martin Luther King Dr, MS 443, Cincinnati, OH 45268.
This study reports improved catalytic activities and stabilities for the oxidation of dimethyl sulfide (DMS), a major pollutant of pulp and paper mills. Ozone is used as an oxidant and Cu, Mo and Mn oxides, and mixed oxide catalysts supported on α-alumina at temperatures ranges 100-200°C. Maximum conversion of DMS was obtained using 10-wt% MnO2/α-Al2O3 as a catalyst; however, the selectivity towards partial oxidation products such as dimethyl sulfoxide and dimethyl sulfone are high (~l20%). The best catalytic activity is obtained over 10-wt% CuO-10-wt% MoO3/α-alumina catalyst with 100% DMS conversion, high selectivity (~l96%) towards complete oxidation products such as CO2 and SO2. Although, MoO3/α-Al2O3 catalyst shows poor catalytic activity, MoO3 acts as a good promoter when used with CuO. This study also reports the optimization of reaction parameters and effects of physico-chemical properties of various catalysts on the catalytic activity.
 

General Papers
6:00 PM-8:00 PM, Wednesday, August 22, 2007 BCEC -- Exhibit Hall - B2, Poster

Division of Environmental Chemistry

The 234th ACS National Meeting, Boston, MA, August 19-23, 2007