The reduction of NO with ethanol reaction was studied. The results showed that the Pd-Mo/HZSM5 was more active at high temperatures than Pd/HZSM-5, due to a molybdenum promotion effect. However, the selectivity to N-2 practically was not altered. Mo/HZSM-5, although less active, presented a high selectivity to N-2. Concerning the carbon species formation, both catalysts showed a high selectivity to ethylene. Some formation of acetaldehyde was observed only in the Mo containing catalysts. The catalytic results showed also that Pd-Mo/HZSM-5 is very selective to CO2 at high temperatures. (C) 2003 Elsevier B.V. All rights reserved.