【摘要】 采用等体积浸渍法制备了Ce–Cu/SSZ-13、Ce–K–Cu/SSZ-13和K–Cu/SSZ-13催化剂，通过模拟气试验平台研究了Ce–Cu/SSZ-13、K–Cu/SSZ-13和Ce–K–Cu/SSZ-13催化剂的氨气选择性催化还原（NH₃ selective catalytic reduction, NH₃-SCR）性能，并且利用X射线衍射（X-ray diffraction, XRD）、比表面积（brunauer emmett teller, BET）、X射线光电子能谱（X-ray photoelectron spectrometer, XPS）和NH₃程序升温脱附（NH₃ temperature programmed desorption, NH₃-TPD）等表征手段评价碱金属钾（K）对Ce–Cu/SSZ-13催化剂理化性质的影响规律。结果表明，碱金属K的引入使得Cu/SSZ-13催化剂的NH₃-SCR性能下降，导致催化剂出现中毒失活现象。与K–Cu/SSZ-13催化剂相比，Ce–K–Cu/SSZ-13催化剂的NO_x脱除效率显著提高，T80（NOx转化率达到80%的温度区间）温度窗口扩宽到220℃～580℃，催化剂表面酸性位点和活性中心Cu²⁺物种数量增加，表明Ce对Cu/SSZ-13催化剂的改性可以提高NH₃-SCR性能，且对催化剂K中毒失活具有一定的抑制作用。更多还原

【Abstract】 Ce–Cu/SSZ-13, Ce–K–Cu/SSZ-13 and K–Cu/SSZ-13 catalysts were prepared with equal volume impregnation method. The NH₃ selective catalytic reduction（NH₃-SCR） performance of the Ce–Cu/SSZ-13, K–Cu/SSZ-13and Ce–K–Cu/SSZ-13 catalysts were investigated by simulated gas experimental platform, and the effects of the introduction of alkali metal potassium on the physical and chemical properties of the Ce–Cu/SSZ-13catalysts were explored by X-ray diffraction（XRD）, specific surface area（BET）, X-ray photoelectron spectroscopy（XPS） and NH₃–programmed temperature desorption（NH₃-TPD） characterizations. The results show that the introduction of alkali metal potassium leads to a decrease in the activity of Cu/SSZ-13 catalyst and produces potassium poisoning deactivation. Compared with the K–Cu/SSZ-13 catalyst, the NO_x conversion of the K–Ce–Cu/SSZ-13 catalyst is increased and the T80 temperature window is widened up to 220～580 ℃, the number of Cu²⁺ species increases at acidic sites and active centers on the catalyst surface, which indicates that Ce has the resistance of potassium poisoning deactivation. The results show that the modification of Cu/SSZ-13 catalyst by Ce can improve the performance of NH₃-SCR, and has a certain resistance effect on the poisoning and deactivation of catalysts.更多还原