On the Pt/V/MCM-41 catalyst with 1 wt% Pt and 4 wt% V, the maximum conversion of NO reduction into N-2 + N2O by C3H6 was about 73%, which was 10% higher than on 1 wt% Pt/silica, and this maximum conversion was maintained over a temperature range of 70degreesC between 270 and 340degreesC.