SELECTIVE CATALYTIC REDUCTION OF NITROGEN-OXIDES WITH HYDROCARBONS OVER ZN-AL-GA COMPLEX OXIDES

Selective reduction of NO with hydrocarbons was studied using metal ox ide catalysts having a spinel structure. A Zn-Al-Ga complex oxide was found to be very active and selective for the catalytic reduction of N O with both C3H6 and CH4. It was revealed that the role of oxygen at t he initial stage of the reaction strongly depends on the reductants; o xygen is mainly used for NO oxidation to NO2 in the reduction with CH4 , whereas it is used both for NO oxidation to NO2 and oxidation of C3H 6 to an active intermediate in the reduction with C3H6.