A study of the abatement of VOC over V2O5-WO3-TiO2 and alternative SCR catalysts

The conversion of C3 organic compounds (propane, propene, 1- and 2-propanol, allyl alcohol, propanal, acrolein, acetone and 1- and 2-chloropropane) in the presence of excess oxygen has been investigated over two V-W-TiO2 commercial SCR catalysts differing in the V content and over Mn-TiO2 alternative SCR catalysts. V-W-Ti catalysts show poor activity in the oxidation of hydrocarbons and oxygenates and give significant amounts of partial oxidation products. Moreover they give rise to CO in excess of CO2, The sample higher in V is more active, Mn-TiO2 is definitely more active in oxidation of hydrocarbons and oxygenates, and produces, at total conversion, CO2 as the only detectable product. V-W-Ti catalysts are very active in dehydrochlorination of the two 2-chlompropane isomers and retain the same oxidation activity also in the presence of HCl. On the contrary, Mn-based catalysts in the presence of chlorocarbons convert into dehydrochlorination catalysts but lose their catalytic activity in oxidation. V-W-Ti catalysts can be used in Cl-containing atmospheres while Mn-TiO2 can be proposed for DeNO(x) and VOC abatement in Cl-free atmospheres such as for diesel engine exhaust gas purification. (C) 2000 Elsevier Science B.V, All rights reserved.