Comparison of the C3H8 oxidation by NO or by O-2 on copper-based catalysts

The selective reduction of NO by C3H8 is performed on copper-based catalyst s, fresh and hydrothermally Cu-MFI with various Si/Al ratios and copper con tents, Cu on conventional nonzeolitic supports with various Cu loadings. In the literature it is already known that the C3H8 oxidation by NO occurs ma inly on isolated copper ions. However, the sites responsible for the C3H8 o xidation by O-2 are less studied. This note shows that nonisolated copper i ons are active for the C3H8 oxidation by O-2. With or without NO in the fee d, bulk oxides are more active for the C3H8-O-2 reaction than for the C3H8- NO (or NO2) reaction. Furthermore, NO inhibits the hydrocarbon combustion b y O-2. (C) 1998 Academic Press.