Synthesis\nand Optimization of Foam Copper-Based CoMnO<sub><i>x</i></sub>@Co<sub>3</sub>O<sub>4</sub>/CF Catalyst:\nAchieving Efficient Catalytic Oxidation of Paraxylene

This study successfully developed\na foam copper (CF)-based CoMnO<sub><i>x</i></sub>@Co<sub>3</sub>O<sub>4</sub>/CF composite\ncatalyst, achieving efficient thermal catalytic oxidation of paraxylene\nthrough multifactor optimization of synthesis conditions. At a Co:Mn\nmolar ratio of 2:1 and a calcination temperature of 450 °C, the\ncatalyst exhibited outstanding catalytic performance, with a <i>T</i><sub>90</sub> temperature as low as 246 °C, significantly\nlower than that of catalysts synthesized under other conditions. Additionally,\nBET, XPS, Raman, EPR, and H<sub>2</sub>-TPR test results indicate\nthat the catalyst possesses a high specific surface area, abundant\noxygen vacancies, a distribution of multivalent Co and Mn species,\nand a lower hydrogen reduction temperature, all of which contribute\nto the high catalytic activity of CoMnO<sub><i>x</i></sub>@Co<sub>3</sub>O<sub>4</sub>/CF. Furthermore, <i>in situ</i> DRIFTS confirmed that the oxidation of paraxylene on CoMnO<sub><i>x</i></sub>@Co<sub>3</sub>O<sub>4</sub>/CF follows the Mars–Van\nKrevelen (MvK) mechanism. The proposed reaction pathway begins with\nthe oxidation of the methyl group on paraxylene, followed by the opening\nof the benzene ring and further oxidation to CO<sub>2</sub> and H<sub>2</sub>O. The innovative structural design and excellent catalytic\nperformance of this catalyst provide new insights and solutions for\nthe industrial treatment of VOCs.