Preparation and catalytic performance of rare earth composite molecular sieve catalyst

Using impregnation method, the catalysts, Re-Cu-K/Y and Re-Cu-K/γ-Al₂O₃, used for the oxidation of HCl were prepared by loading the rare earth elements, Ce, Pr and Nd, on the Y-type molecular sieve and γ-Al₂O₃, respectively. The catalysts prepared were characterized by XRD, ESEM and BET, and their catalytic activities for oxidation of HCL were measured too. The XRD pattern of catalyst Re-Cu-K/γ-Al₂O₃ shows that there are characteristic diffraction peaks of rare earth oxide and potassium chloride in it, and the detected rare earth diffraction signals mainly are the signals of the CeO₂ crystal phase. While in the XRD pattern of catalyst Re-Cu-K/Y, except the diffraction peaks of the Y-type molecular sieve supporter, no any other diffraction signal of relative crystal phase is detected. The ESEM images show that the structure of Y-type molecular sieve supporter doesn't be destroyed by loading the Cu, K and rare earth elements on it. It was found that the catalyst Re-Cu-K/Y exhibits good catalytic activity for oxidation of HCl, and using it with the V (HCl)/V (O₂) of 1.5 and at 648 K, the convertion of HCl can reach 85%.