SELECTIVE CATALYTIC REDUCTION OF NO BY DECANE

The Selective Catalytic Reduction (SCR) of NO by decane under an oxidi zing atmosphere has been carried out on mechanical mixtures of sulfate d zirconia with manganese oxide or copper manganite. Sulfated zirconia s alone are inactive and MnO2 and Cu5Mn13Ox oxidize selectivity NO to NO2 above 550 K. A simple mechanical mixture in 1/1 ratio of sulfated zirconia, with an adequate amount of sulfur, with MnO2 or Cu5Mn13Ox de lays the oxidation of NO, to NO2, but to a lesser extent that of decan e. However, the main effect observed at low temperature is the large i ncrease of NO reduction to N-2 which occurs in a large temperature ran ge. This high reductive activity results from the combined effect of a cid and oxidizing properties exhibited by the sulfated zirconia and Mn O2, or Cu5Mn13Ox, respectively.