MnCu-SSZ-13@CeO2 zeolite catalyst with core-shell structure was prepared by ion exchange and self-assembly methods. The structure and morphology of the catalyst were studied by X-ray diffraction (XRD), scanning electron microscope (SEM) and transmission electron microscope (TEM). The results showed that the characteristic peaks of both SSZ-13 zeolite and CeO2 were observed in the XRD spectrum of MnCu-SSZ-13@CeO2 catalyst, and the CeO2 shell was uniformly coated on the outer surface of the zeolite catalyst. Furthermore, the redox capacity as well as the content and distribution of the surface acid sites were analyzed by H2 temperature programmed reduction (H2-TPR) and NH3 temperature programmed desorption (NH3-TPD) techniques. The evolution of chemical properties of the catalysts before and after CeO2 coating was clarified. The catalytic activity and sulfur resistance of the catalysts in NH3-SCR reaction were investigated. The results showed that the NOx conversion rate of uncoated MnCu-SSZ-13 catalyst in NH3-SCR reaction was about 85% between 200 ℃ and 450 ℃, while the catalytic activity was significantly enhanced after CeO2 coating. When the mass fraction of CeO2 was 3.16%, MnCu-SSZ-13@CeO2 catalyst achieved nearly 100% of NOx conversion rate between 200 ℃ and 500 ℃. The MnCu-SSZ-13@CeO2 catalyst also showed good sulfur resistance at 300 oC when the feeding reactant contained SO2 of 0.01%(volumn fraction).

MnCu-SSZ-13; CeO2 coating; denitration activity; sulfur resistance