本文選題：負(fù)載型 + 雙金屬　； 參考：《北京化工大學(xué)》2017年碩士論文

【摘要】：VOCs污染導(dǎo)致的各種環(huán)境、經(jīng)濟(jì)問題大大影響著人類的生活,而催化燃燒處理VOCs的催化劑是目前廣泛研究的熱點(diǎn)。本課題旨在研究雙金屬負(fù)載型催化劑,考察其在催化燃燒含苯廢氣反應(yīng)中的催化性能,研究不同雙金屬之間的相互作用對催化劑催化性能的影響;并采用了 XRD、H2-TPR、XPS、BET、TPD等表征方式對催化劑的性質(zhì)做了更加深入的輔助分析。最后進(jìn)行催化劑壽命的研究。以Cu作為主要金屬,添加Mn、Co、Cr、Fe、Ce等為輔助金屬制備成的催化劑用于催化燃燒含芳烴廢氣的研究中,10%的總金屬負(fù)載量為合適的選擇,Cu與不同的第二金屬之間發(fā)生的協(xié)同作用不同,當(dāng)Cu與第二金屬之間所發(fā)生的協(xié)同作用可以形成類似Cu-M-O (M代表第二摻雜的金屬)的結(jié)合體,而且當(dāng)這種結(jié)合體可以促進(jìn)雙金屬多級還原發(fā)生時(shí)即相互作用越強(qiáng)時(shí),更有利于催化劑的活性提高。在一系列Cu-M雙金屬負(fù)載的催化劑中,Cu-Mn雙金屬負(fù)載在γ-Al_2O_3上制備的催化劑催化燃燒處理苯的性能最優(yōu)異。研究Cu-Mn負(fù)載在γ-Al_2O_3上制備的催化劑中,改變Cu/Mn的摩爾比值,催化劑的制備方式,以及催化劑的焙燒溫度,對催化劑催化燃燒含苯廢氣性能的影響實(shí)驗(yàn)中,當(dāng)Cu/Mn的摩爾比值為2,采用等體積浸漬法,并且焙燒溫度是550 ℃時(shí),催化劑催化燃燒苯的性能是最優(yōu)異的,與其他條件制備的催化劑相比較,該催化劑中Cu-Mn之間的發(fā)生了多級還原過程,而且Cu~(2+)的量達(dá)到最高,同時(shí)催化劑中Mn~(2+),Mn~(3+),Mn4+三種價(jià)態(tài)的Mn物種均存在時(shí),Cu-Mn之間的相互作用也達(dá)到最強(qiáng)。研究催化劑載體對催化劑催化燃燒處理含苯廢氣的研究中,不同的氧化物載體,不同的分子篩載體,對所制備的催化劑的性能影響有較大的區(qū)別,而且分子篩載體的比表面積、SiO2/Al_2O_3對催化劑的性能有一定的影響,主要是SiO2/Al_2O_3對催化劑性能影響較大,當(dāng)SiO2/Al_2O_3逐漸增大時(shí),催化劑的酸性先是漸漸加強(qiáng),而后又減弱,催化劑的活性也是先增強(qiáng),后又減弱,在SiO2/Al_2O_3=360,催化劑酸性最強(qiáng),而且Cu~(2+)的量達(dá)到最高,同時(shí)催化劑中Mn~(2+),Mn~(3+),Mn4+三種價(jià)態(tài)的Mn物種均存在,Cu-Mn之間的相互作用也達(dá)到最強(qiáng)。活性也最優(yōu),而且催化劑的穩(wěn)定性也較優(yōu)異。
[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 緯 -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，

本文編號：2091155