【摘要】 针对Cu O（20%）/γ-Al₂O₃催化剂催化燃烧性能的欠缺,通过共沉淀捏合法制备了CuO（20%）/Ce_x Al_100-xO_y（x=1,3,5,7,10,12）系列催化剂,并通过XRD、BET、XPS、H2-TPR、TEM等系列表征方法对催化剂进行了表征,研究了Ce掺杂对催化燃烧效果的影响.表征结果表明,Ce掺杂可以促进催化剂表面Cu O的分散,为反应提供更多活性位点,增强催化剂的低温还原性,并提供更多的表面吸附氧,这些都有利于催化燃烧活性的提高.同时,所有催化剂均在以典型的VOC甲苯作为底物的催化燃烧实验中进行了评估,其中CuO（20%）/Ce₇Al₉₃O_y表现出最高的催化燃烧活性,与Cu O（20%）/γ-Al₂O₃相比,其T90降低了约30℃.比较其他结果,掺杂量低时,催化剂改性结果较差;而在掺杂量过多时,反而会严重损害催化剂性质,如催化剂中的γ-Al₂O₃骨架可能会坍塌,影响催化燃烧活性.这可以证明Ce掺杂可以有效提高催化剂的燃烧活性,而合适的Ce掺杂量对催化剂改性是很关键的.同时,还对所得的最优催化剂进行了稳定性和普适性的测试,并得出了较好的结果.综上,本研究集中于掺杂量对催化剂的影响,为后续研究提供了理论基础.更多还原

【Abstract】 To improve the catalytic combustion activity of CuO（20%）/γ-Al₂O₃,CuO（20%）/Ce_x Al_100-xO_y（x=1,3,5,7,10,12）catalysts were prepared by coprecipitation-kneading method. They were characterized by serial characterization methods,such as XRD,BET,XPS,H2-TPR,TEM. The characterization results showed that the Ce doping could promote Cu O dispersion,provide more active sites,strengthen the low temperature reducibility and provide more oxygen adsorbed on the surface,which is beneficial for the combustion activity of the catalyst. Meanwhile,all catalysts have been evaluated for catalytic combustion of toluene,a typical VOC. Among them,Cu O（20%）/Ce₇Al₉₃O_y exhibited the highest catalytic combustion activity that T90 reduced by about 30℃ compared to CuO（20%）/γ-Al₂O₃. It indicates that Ce doping can effectively improve the combustion activity of the catalyst. It is worth noting that an adequate amount of Ce doping is important for the modification of the catalyst. First,the modification effect is insufficient when the amount of doping is low. But when the amount of doping is excessive,the γ-Al₂O₃ skeleton can collapse,resulting in damage to catalytic activity. In addition,we obtained satisfactory results in tests of stability and universality of the catalysts. Therefore,this study focused on the effect of the amount of doping on catalysts,providing a theoretical basis for further research.更多还原