通过浸渍法制备了不同负载量的Cu/SAPO-34和Cu-Ce/SAPO-34催化剂，探究Cu、Ce负载量对催化剂性能的影响。结果表明，4%负载量的Cu/SAPO-34催化剂表现出优异的NH₃-SCR性能，在231~586℃时转化率均达到80%以上，最高脱硝效率达到98.79%。通过共负载过渡金属Cu和Ce元素，提高了催化剂的中低温NH₃-SCR性能，拓宽了催化剂活性温度窗口。XRD、H₂-TPR、NH₃-TPD表征结果表明，掺杂Ce元素可以抑制CuO生成，同时可以促进活性较高的Cu²⁺生成。增加Cu负载量可以提高Cu/SAPO-34催化剂酸性位的数量，Ce元素的掺杂占据分子筛载体的B酸性位，造成催化剂的中强度酸性位数量减少，Cu/Ce物质的量的比为4：5时最佳。

A series of Cu/SAPO-34 and Cu-Ce/SAPO-34 catalysts with different loadings are prepared by impregnation method.The effects of Cu and Ce loadings on the performance of the catalysts are investigated.Experimental results show that Cu/SAPO-34 catalyst with a 4% of loadings has excellent NH₃-SCR performance,over which the conversion efficiency can exceed 80% in the temperature range of 231-586℃,and the highest denitration efficiency reaches 98.79%.By co-loading transition metals Cu and Ce,the performance of the catalyst in medium-low temperature NH₃-SCR is improved,and the activity temperature window of the catalyst is broadened.XRD and H₂-TPR characterization shows that Ce doping can inhibit the formation of CuO and promote the formation of Cu²⁺ with higher activity.NH₃-TPD characterization shows that higher Cu loadings can increase the number of acid sites of Cu/SAPO-34 catalyst.Ce doping may occupy B acid position of the molecular sieve carrier,resulting in a decrease in the number of medium-strength acid sites of the catalyst.Therefore the optimum doping amount of Cu/Ce is 4:5.

胡宜康(1993-),男,硕士研究生,研究方向为柴油机尾气后处理,1328845950@qq.com