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 comm
ercial SCR catalysts differing in the V content and over Mn-TiO2 alternativ
e SCR catalysts. V-W-Ti catalysts show poor activity in the oxidation of hy
drocarbons and oxygenates and give significant amounts of partial oxidation
products. Moreover they give rise to CO in excess of CO2, The sample highe
r in V is more active, Mn-TiO2 is definitely more active in oxidation of hy
drocarbons and oxygenates, and produces, at total conversion, CO2 as the on
ly detectable product.
V-W-Ti catalysts are very active in dehydrochlorination of the two 2-chlomp
ropane isomers and retain the same oxidation activity also in the presence
of HCl. On the contrary, Mn-based catalysts in the presence of chlorocarbon
s convert into dehydrochlorination catalysts but lose their catalytic activ
ity 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 atm
ospheres such as for diesel engine exhaust gas purification. (C) 2000 Elsev
ier Science B.V, All rights reserved.