催化作用
化学
氧化还原
解吸
邻二甲苯
二甲苯
对二甲苯
反应机理
氧气
催化氧化
无机化学
吸附
火星探测计划
物理化学
有机化学
甲苯
物理
天文
作者
Hanxi Li,Xiaojing Li,Yonghong Li,Mengyang Guo
标识
DOI:10.1016/j.mcat.2022.112482
摘要
In this research, a novel CoMn2O4 catalyst was prepared for the removal of o-xylene, m-xylene, and p-xylene. The catalyst showed better activity than that of MnO2 and Co3O4. The better activity of CoMn2O4 was attributed to the abundant concentration of Co2+, Mn3+, and lattice oxygen. Kinetic studies were carried out for the catalytic oxidation of three xylenes over the CoMn2O4 catalyst based on the Power-Low model, the Mars-van Krevelen model, the Eley-Rideal model, and the Langmuir-Hinshelwood model. All the three reactions could be most accurately described by the Mars-van Krevelen model, which suggested that the isomers of xylene had very little effect on the mechanism of xylene oxidation over the CoMn2O4 catalyst. The activation energies of the oxidation processes of o-xylene, m-xylene, and p-xylene were 94.64 kJ/mol, 78.46 kJ/mol, and 57.13 kJ/mol, respectively. The proposed mechanism based on the Mars-van Krevelen model suggested that xylene molecules reacted with the Co3+ and Mn4+/Mn3+ on the CoMn2O4 catalyst and participated in the cycle of adsorption, redox, and desorption.
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