尖晶石
兴奋剂
二氯甲烷
布朗斯特德-洛瑞酸碱理论
离解(化学)
化学
无机化学
键裂
催化作用
材料科学
冶金
有机化学
溶剂
光电子学
作者
Yu-Kun Ma,Long-Ren Ouyang,Yanling Yao,Zhifeng Dai,Yu Wang,Ji-Qing Lu
标识
DOI:10.1016/j.cej.2024.154538
摘要
A series of Mo-doped CoAl2O4 spinel oxides were prepared and tested for deep oxidation of dichloromethane (CH2Cl2). The Mo-doping resulted in much improved surface acidity of the catalyst, and thus significantly enhanced the catalytic activity. The best performance was obtained on a CoAl1.7Mo0.3O4 catalyst, which gave a nearly 3-fold higher reaction rate than the pristine CoAl2O4 (26.5 x 10-8 versus 10.5 x 10-8 mol g−1 s−1 at 230 °C). Moreover, the Mo-doped catalyst remarkably suppressed the formation of organic byproduct of CH3Cl. The good catalytic performance of the catalysts was ascribed to the fact that abundant Brønsted acid sites derived from Mo5+–OH in the Mo-doped catalysts facilitated the C-Cl bond cleavage of the CH2Cl2 and CH3Cl reactants and their further oxidation. Water in the reaction feed was found to enhance the activity, due to its dissociation on the catalyst surface to hydroxyl groups that could react with CH2Cl2. Therefore, our findings revealed the vital roles of surface Brønsted acidity and H2O in the catalytic combustion of chlorinated volatile organic compounds.
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