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A series of metal catalysts (Pd, Rh, Ru, Cu, Fe, In and Ni) supported on c-Al 2 O 3 carrier, were evaluated during N 2 O catalytic conversion to N 2 in the absence and presence of excess oxygen and reducing agents (CH 4 or C 3 H 8 ). Among all catalysts tested, Pd-, Ru-and Rh-based samples exhibited the best catalytic performance, in all reaction conditions examined. The reaction was inhibited by O 2 , in particular at lower temperatures, while its effect was essentially negligible at higher ones. In the presence of reducing agents and under lean reaction conditions, N 2 O conversion was comparably enhanced, with C 3 H 8 being more efficient than CH 4 ; however even in the presence of hydrocarbons N 2 O decomposition is the major pathway for N 2 O abatement, since reducing agents mainly act as oxygen scavengers reducing and concurrently activating the metal sites. The influence of different co-existing gases (CO, H 2 O and SO 2 ) on the performance of Pd supported catalysts was also investigated, whereas thermal stability tests in the presence of SO 2 indicate a gradual irreversible decrease in activity until a new steady state was established.