Influence of Calcination Temperature of TiO2 Support on CuO/TiO2 Catalysts for NO + CO Reaction

A series of CuO/TiO 2 catalysts were prepared with sol-gel and impregnation method and characterized by TG-DSC、FTIR、XRD and H 2 -TPR. The effect of calcination temperature of TiO 2 carrier on the performance of CuO/TiO 2 for the NO + CO reaction was investigated. The results showed that CuO/TiO 2 (500°C, 15%) catalyst had superior catalytic activity with NO conversion and N 2 selectivity of 99.5% and 82.3% at 350°C, respectively. The activities of the CuO/TiO 2 catalysts were in the sequence of CuO/TiO 2 (500) > CuO/TiO 2 (600) > CuO/TiO 2 (700) > CuO/TiO 2 (400). Combined with TG-DSC and XRD patterns, the anatase phase transform into rutial phase at 462.9°C to 800°C in the TG-DSC patterns, while only rutile phase was present at 700°C in the XRD patterns. It indicated that CuO had a positive effect on phase transformation of TiO 2 from anatase to rutial. The IR spectra demonstrated that there were some organic ingredients left in the surface of TiO2 gel before calcination. The results of H 2 -TPR suggested that the highly dispersed CuO was present on the CuO/TiO 2 catalysts when the calcination temperature of TiO 2 gel was below 500°C. Mixed oxide of CuO and TiO 2 was formed when the calcination temperature of TiO2 gel was above 600°C.