Co2Cu1Ce y O x Mixed Metal Oxide Nanoparticles with Oxygen Vacancies as Catalysts for Toluene Oxidation

• Published in: ACS applied nano materials Vol. 6; no. 20; pp. 18823 - 18836
• Main Authors: Sun, Ning, Wang, Liying, Zhang, Yongfeng, Cao, Zhenzhu, Sun, Junmin
• Format: Journal Article
• Language: English
• Published: American Chemical Society 27.10.2023
• Subjects: mixed oxide interfaces; mechanical synthesis; Co–Cu–Ce bimetallic oxides; catalytic oxidation of toluene; oxygen vacancies
• ISSN: 2574-0970; 2574-0970
• DOI: 10.1021/acsanm.3c02947

A multimetal MOF (metal–organic framework), Ce­(III)/Co2Cu1-MOF-74, has here been synthesized in a simple and convenient manner by using the mechanical ball milling method. This method is both energy-saving and environmentally friendly. By using the obtained product compounds as a template, Co2Cu1Ce y O x mixed metal oxides were prepared by calcination to serve as a catalyst for toluene catalytic oxidation. Co2Cu1Ce y O x had the form of nanoparticles with a uniform morphology. As a result of the experiments, the conversion percentages of the Co2Cu1Ce0.75O x catalyst in catalyzing the toluene oxidation reached 50% (T 50) and 90% (T 90) at the temperatures of 196 and 210 °C, respectively. The Co2Cu1Ce0.75O x catalyst exhibited an abundance of multiphase interfaces and metal doping effects, which effectively induced an abundance of oxygen vacancies on the catalyst surface. Furthermore, the Co2Cu1Ce0.75O x catalyst exhibited excellent durability within 24 h and demonstrated remarkable regenerative capabilities after steam-induced reduction by 5%. Thus, the use of MOFs as precursor compounds, which were mechanically synthesized in a green and rapid manner, helped to design high-efficiency multimetal mixed oxide nanoparticle catalysts with abundant multiphase interfaces, which could be used for toluene catalytic oxidation. This rendered possibilities for large-scale applications in related areas.