Several catalysts based on transition metals (Cu, Co, Fe) and different sup
ports (ZSM-5, activated carbon, Al2O3) have been tested by Temperature-Prog
rammed Reaction (TPR) experiments for the selective catalytic reduction of
NOx with propene in the presence of excess oxygen, simulating lean-burn con
ditions. The activity order with respect to the metal was Cu similar to Fe>
Co for all supports used. ZSM-5 catalysts have a superior behavior over Al2
O3, as observed for noble metal catalysts. Application of activated carbon
as a support is not practical due to its consumption at the reaction temper
atures. The selectivity to N-2 of the catalysts was also independent of the
support, being higher than 95% in all the cases.