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制备了Cu/Ce(x)/Al2O3(x为Ce与Al的摩尔比)系列氧化催化剂,并考察了(Ag/Al2O3+Cu/Ce(x)/Al2O3)组合体系催化乙醇还原NOx以及氧化去除反应副产物(CO和未完全燃烧的碳氢化合物)的活性.在200～350℃温度区间,组合催化剂具有与Ag/Al2O3相似的NOx去除效率.随着Ce/Al比增加,氧化催化剂去除CO的活性逐渐提高.Cu/CeO2催化剂具有最好的氧化活性,但其对NOx的去除有较大影响.综合考虑NOx转化率以及CO和HC的去除效果,(Ag/Al2O3+Cu/Ce(0·15)/Al2O3)是最佳的催化剂组合体系.通过对此系列氧化催化剂的BET比表面积、XRD、H2-TPR以及XPS等表征结果的分析,发现Cu和Ce之间的相互作用是催化剂氧化CO能力提高的主要原因.
A series of oxidation catalysts Cu / Ce (x) / Al2O3 (x is the molar ratio of Ce to Al) were prepared, and the combination of (Ag / Al2O3 + Cu / Ce Reaction by-products (CO and incompletely burned hydrocarbons). The combined catalyst has similar NOx removal efficiency as Ag / Al2O3 at temperatures in the range of 200 to 350 ° C. As the Ce / Al ratio increases, the oxidation catalyst removes CO The activity of Cu / CeO2 catalyst has the best oxidation activity, but it has a great influence on the removal of NOx.Considering the conversion efficiency of NOx and the removing effect of CO and HC, · 15) / Al2O3) is the best catalyst system.By analyzing the characterization results of BET surface area, XRD, H2-TPR and XPS of this series of oxidation catalysts, we found that the interaction between Cu and Ce is the catalyst oxidation CO increase the main reason.