【作者】 熊坤； 郭家宏； 梁艳； 林坤森； 路星雯；

【Author】 Xiong Kun;Kuo Jiahong;Liang Yan;Lin Kunsen;Lu Xinwen;School of Environmental Science and Engineering,Guangdong University of Technology;Department of Environmental and Safety Hygiene,National United University of Taiwan;

【机构】 广东工业大学环境科学与工程学院； 台湾国立联合大学环境与安全卫生工程系；

【摘要】 利用湿式含浸法制备了一系列Cu-Co/Al₂O₃单/双金属催化剂,并将其运用于CO还原NO的反应。探究了不同操作条件下催化剂性能的差异,同时对比了不同酸溶液对载体进行预处理后的效果。实验结果表明:在含氧条件下催化剂的NO转化率随着空间速度增大呈下降趋势;此外,还原气氛煅烧更有利于催化转化NO。BET分析指出Cu、Co双金属可以互相促进分散程度,催化活性明显优于单金属催化剂,其中最佳的Cu/Co值为1/3,最佳的Cu-Co总量为9%。另外,结合TEM图可看到除盐酸以外,酸液预处理后载体可溶解Al₂O₃孔洞内的杂质,增加孔洞,使得活性组分高度分散。而盐酸预处理的催化剂会生成大量氯化物腐蚀载体,使孔洞消失导致催化剂性能下降。更多还原

【Abstract】 A series of Cu-Co/A1203 single/bimetallic catalysts were prepared by wet impregnation and were used for CO reduction of NO. Different operating conditions were considered to investigate the performance of catalysts in CO-SCR process.Results showed that the NO conversion rate decreased with increasing space velocity. Catalysts calcined in reducing atmosphere provided a higher NO conversion rate than those were calcined in air. Additionally, a better NO conversion was found by applying 5% Cu₁ Co3/A12 03 bimetallic catalyst than other single metallic catalysts possibly, which can be ascribed that Cu and Co might promote the dispersion degree of each other according to the results of BET analysis. The optimum amount of Cu/Co and contents was 1/3 and 9%, respectively. CH₃ COOH can improve the performance of the catalyst due to it could dissolve the impurities on the support, increase the pore size and specific surface area according to the TEM and BET. Finally, a large number of Chloride appeared after HC1 pretreated the support and corroded the support, reduced the average pore size and decreased the performance of the catalyst.更多还原