Abstract
The reduction of N2O to N2 was carried out by temperature programmed surface reaction (TPSR) from 473 to 873 K in He, He + 3% O2, He + 0.02% NH3 and He + 3% O2 + 0.02% NH3 on H–FAU supported transition metal catalysts. In the absence of oxygen, the addition of NH3 considerably shifts the N2O conversion profile towards lower temperatures. This is particularly true for the Ru– and Rh–FAU which exhibit the onset of N2O conversion around 500 K. The addition of O2 inhibits this effect for most of the catalysts and NO formation due to NH3 oxidation is observed. However Fe–, Ni– and Co–FAU kept the best catalytic behaviour for N2O reduction to N2 in the presence of O2, when NH3 was added to the feed with respect to the decomposition reaction.