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The Cu/TiO 2 catalysts with different Cu loadings were prepared, and their performance in the selective catalytic oxidation of ammonia (SCO of NH 3 ) was compared with 10% Cu/Al 2 O 3 . The 10% Cu/TiO 2 has the best performance among its series for NH 3 conversion and N 2 selectivity. At 250• C, the 100% conversion of ammonia was achieved and the selectivity to N 2 came to 95%. The 10% Cu/TiO 2 catalyst has a much higher activity for the SCO of ammonia and a slightly lower N 2 selectivity than 10% Cu/Al 2 O 3 because of the higher oxygen mobility and lower oxygen bonding strength, which demonstrated that TiO 2 is a more suitable support than Al 2 O 3 for copper-based catalyst in the SCO of NH 3 . The mechanisms involved in the SCO of NH 3 reaction on the 10% Cu/TiO 2 catalyst have also been investigated using TPD, TPR as well as in situ DRIFTS methods.