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Mn-Co氧化物制备及其甲苯催化性能研究
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摘要
挥发性有机污染物的大量排放对人类和环境造成了严重危害,控制挥发性有机污染物的排放刻不容缓。近年来催化氧化法[1]作为去除挥发性有机污染物最经济有效的技术之一受到众多研究者的青睐[1]。本论文采用不同合成方法制备出Mn-Co氧化物催化剂并调节Mn/Co比例,研究其对甲苯催化氧化活性的影响。采用溶胶凝胶、氧化还原、冰浴混合等f方法制备Mn-Co氧化物催化剂并测试其甲苯氧化活性。研究发现,氧化还原法和溶胶凝胶法制备的Mn-Co氧化物催化剂在甲苯氧化中呈现出较好的催化活性。研究中进一步优化溶胶凝胶法和氧化还原法中Mn-Co摩尔比例。研究发现,在溶胶凝胶法中Mn-Co(2:1)氧化物催化剂表现出最佳的甲苯催化氧化活性,而对于氧化还原法制备的Mn-Co(1:2)氧化物催化剂的活性最佳。与贵金属催化剂(Pd)活性相近[2],相比过渡金属Mn基催化剂[3],其完全转化温度降低了20oC。
The increasing emission of VOCs(volatile organic compounds) cause terrible effects on human beings.The catalytic oxidation is one of the most effective and economic technologies for removing VOCs,which has attracted more attention of many researchers in recent years.This work constructs and optimizes Mn-Co catalyts by using different methods,and changing the ratio of Mn and Co.The Mn-Co oxides catalyts prepared by the sol-gel and redox method show the better activity for toluene oxidation.Optimizing Mn-Co catalysts by changing Mn-Co molar ratio.When the Mn-Co molar ratio is 2:1,the Mn-Co catalyst prepared by sol-gel method shows an outstanding catalytic activity,but the best Mn-Co molar ratio of the sample prepared by redox method is 1:2.The Mn-Co oxides catalyts show similar activity to noble catalyst(Pd),and complete conversion temperature decrease by 20 ℃.
引文
[1]Carabineiroa,S A C.;Chen,X.;Konsolakis,M.Catal.Today.2015,244:161-171.
    [2]Yang,H G.;Deng,J G.;Liu,Y X.J.Mol.Catal.A-chem.2016,414:9-18.
    [3]Li,W B.;Chu,W B.;Zhuang M.Catal.Today.2004,93-95:205-209.

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