Synergetic Effects of CuO and CeO2 on Hydrogen Chloride Catalytic Oxidation
1. College of Chemistry and Chemical Engineering, Nanjing University of Technology; 2. State Key Laboratory of Materials-Oriented Chemical Engineering, Nanjing University of Technology, Nanjing 210009, China
Abstract CuO/Y, CeO2/Y and CuO-CeO2/Y catalysts for hydrogen chloride oxidation were prepared by impregnation method. The catalysts were characterized by means of scanning electron microscope (SEM), X-ray diffraction(XRD), Brurauer Emmerr Teller Procedure(BET), Raman and temperature programmed reduction(H2-TPR). The results of SEM, XRD and BET showed that the structure of the catalysts kept stable during the reaction. CuO and CeO2 displayed different reaction character: CuO was chlorinated, and the aggregation of the chlorinated copper species resulted in the decreasing of surface area of CuO/Y-U; while CeO2 did not undergo chlorinated and become more disperse. The results of the catalytic performance test showed that CuO-CeO2/Y catalyst exhibited the highest activity, and the conversion of HCl was 90% at 390 ℃, indicating the significant synergetic effects between CuO and CeO2. The results of Raman and H2-TPR showed that cupric ion entered into CeO2 lattice, leading to the lattice deformation. On the other hand, CeO2 could improve the dispersion and redox property of CuO. Over the CuO-CeO2/Y catalyst, the high dispersion of copper species was responsible for the high catalytic performance.
