As a kind of VOCs, the direct catalytic oxidation of toluene to CO₂ and H₂O is a great challenge. A high-performance catalyst plays a crucial role in catalytic oxidation. Herein, UiO-66-Ce and a series of transition metals-doped UiO-66-CeM (M = Cu, Co, Mn, Fe, Zr) through a rapid and facile one-step synthesis method are prepared to investigate the catalytic oxidation of toluene. Experiments disclose that the UiO-66-CeCu exhibits extremely high catalytic capacity. A range of characterizations reveals that the oxygen vacancies formed between Ce and the doped metal. Better redox performance play a key role in the oxidation of toluene (Ce⁴⁺+Mⁿ⁺→Ce³⁺+M⁽ⁿ⁺¹⁾⁺). Most importantly, the analysis of the catalytic oxidation mechanism in situ DRIFTS in different conditions. Concluded that toluene oxidation is the coexistence of MvK mechanism and L-H mechanism. Furthermore, the oxygen vacancies increase the mobility of gaseous oxygen on the surface, which is essential in improving catalytic activity. Finally, the degradation pathway of toluene in UiO-66-CeM was concluded as follows: toluene → benzyl alcohol → benzoic acid → acid anhydride …...CO₂ and H₂O.

作为VOCs的一种，甲苯直接催化氧化成CO ₂和H ₂ O是一个很大的挑战。高性能催化剂在催化氧化中起着至关重要的作用。本文通过快速简便的一步合成方法制备了 UiO-66-Ce 和一系列过渡金属掺杂的 UiO-66-CeM (M = Cu, Co, Mn, Fe, Zr)，用于研究催化氧化甲苯。实验表明，UiO-66-CeCu 表现出极高的催化能力。一系列表征表明，在 Ce 和掺杂金属之间形成了氧空位。较好的氧化还原性能在甲苯的氧化中起关键作用（Ce ⁴⁺ +M ⁿ⁺ →Ce ³⁺ +M ⁽ⁿ⁺¹⁾⁺）。最重要的是分析了不同条件下原位DRIFTS的催化氧化机理。得出甲苯氧化是MvK机制和LH机制并存的结果。此外，氧空位增加了气态氧在表面上的流动性，这对于提高催化活性至关重要。最后得出甲苯在UiO-66-CeM中的降解途径为：甲苯→苯甲醇→苯甲酸→酸酐……CO ₂和H ₂ O。