The effect of CuSO 4 on the property of catalyst CuO/Al 2O 3 has been investigated. The TPD MS results showed that the amount of oxygen adsorbed on the surface of CuSO 4 CuO/Al 2O 3 increased with CuSO 4 content in the catalyst and the oxygen desorbed only at temperature above 900 K . TPSR results showed three adsorption sites of NO on the surface of CuO/Al 2O 3, respectively at 398, 643 and 683 K. The active site at 683 K was for NO decomposition and it was poisoned seriously when there was CuSO 4 in the CuO/Al 2O 3. For CuSO 4 CuO/Al 2O 3 the amount of N 2O formed from NO decomposition reduced probably due to the increase of oxygen species in the catalyst.
