负载型金属氧化物催化剂催化燃烧处理含芳烃废气的研究
发布时间:2018-07-02 22:36
本文选题:负载型 + 双金属 ; 参考:《北京化工大学》2017年硕士论文
【摘要】:VOCs污染导致的各种环境、经济问题大大影响着人类的生活,而催化燃烧处理VOCs的催化剂是目前广泛研究的热点。本课题旨在研究双金属负载型催化剂,考察其在催化燃烧含苯废气反应中的催化性能,研究不同双金属之间的相互作用对催化剂催化性能的影响;并采用了 XRD、H2-TPR、XPS、BET、TPD等表征方式对催化剂的性质做了更加深入的辅助分析。最后进行催化剂寿命的研究。以Cu作为主要金属,添加Mn、Co、Cr、Fe、Ce等为辅助金属制备成的催化剂用于催化燃烧含芳烃废气的研究中,10%的总金属负载量为合适的选择,Cu与不同的第二金属之间发生的协同作用不同,当Cu与第二金属之间所发生的协同作用可以形成类似Cu-M-O (M代表第二掺杂的金属)的结合体,而且当这种结合体可以促进双金属多级还原发生时即相互作用越强时,更有利于催化剂的活性提高。在一系列Cu-M双金属负载的催化剂中,Cu-Mn双金属负载在γ-Al_2O_3上制备的催化剂催化燃烧处理苯的性能最优异。研究Cu-Mn负载在γ-Al_2O_3上制备的催化剂中,改变Cu/Mn的摩尔比值,催化剂的制备方式,以及催化剂的焙烧温度,对催化剂催化燃烧含苯废气性能的影响实验中,当Cu/Mn的摩尔比值为2,采用等体积浸渍法,并且焙烧温度是550 ℃时,催化剂催化燃烧苯的性能是最优异的,与其他条件制备的催化剂相比较,该催化剂中Cu-Mn之间的发生了多级还原过程,而且Cu~(2+)的量达到最高,同时催化剂中Mn~(2+),Mn~(3+),Mn4+三种价态的Mn物种均存在时,Cu-Mn之间的相互作用也达到最强。研究催化剂载体对催化剂催化燃烧处理含苯废气的研究中,不同的氧化物载体,不同的分子筛载体,对所制备的催化剂的性能影响有较大的区别,而且分子筛载体的比表面积、SiO2/Al_2O_3对催化剂的性能有一定的影响,主要是SiO2/Al_2O_3对催化剂性能影响较大,当SiO2/Al_2O_3逐渐增大时,催化剂的酸性先是渐渐加强,而后又减弱,催化剂的活性也是先增强,后又减弱,在SiO2/Al_2O_3=360,催化剂酸性最强,而且Cu~(2+)的量达到最高,同时催化剂中Mn~(2+),Mn~(3+),Mn4+三种价态的Mn物种均存在,Cu-Mn之间的相互作用也达到最强。活性也最优,而且催化剂的稳定性也较优异。
[Abstract]:Various environmental and economic problems caused by VOCs pollution have a great impact on human life, and catalytic combustion catalysts for VOCs treatment are currently the focus of extensive research. The purpose of this paper is to study bimetallic supported catalysts, investigate their catalytic performance in the catalytic combustion of benzene-containing waste gas, and study the effect of different bimetallic interactions on the catalytic performance of the catalysts. The properties of the catalyst were characterized by XRDX H2-TPRN XPSN BET-TPD, and the properties of the catalyst were further analyzed. Finally, the life of the catalyst was studied. In the study of catalytic combustion of aromatics waste gas with Cu as the main metal and MnCoCoCe as auxiliary metal, the synergistic effect between Cu and different second metals is different when 10% of the total metal load is the appropriate choice. When the synergy between Cu and the second metal can form a Cu-M-O (M for a second doped metal), and when such a combination can promote the occurrence of multilevel reduction of bimetallic, the stronger the interaction is, It is more favorable to increase the activity of the catalyst. In a series of Cu-M bimetallic supported catalysts, the catalyst prepared on 纬 -Al _ 2O _ 3 supported on Cu-Mn bimetallic supports has the best catalytic combustion performance for benzene treatment. The effects of the molar ratio of Cu / mn, the preparation method of the catalyst and the calcination temperature of the catalyst on the catalytic combustion of benzene-containing waste gas were studied. When the molar ratio of Cu / mn is 2, the catalytic performance of the catalyst for benzene combustion is the best when the molar ratio of Cu / mn is 2 and the calcination temperature is 550 鈩,
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