Achievement of catalytic oxidation of volatile organic compounds (VOCs) at low temperature is still a challenge to be addressed. Promoting catalytic activity via constructing oxygen vacancy defect is an attractive strategy in heterogeneous catalysis. Herein, a series of CeCoM (M = Cu, Mn, Zr) catalysts were prepared by modified co-precipitation method and their catalytic oxidation performance of toluene was measured. Activity results suggested that the introduction of doping-metals significantly enhanced the catalytic performance of CeCoO, with CeCoCu possessed the optimal catalytic activity (T = 210 ℃), robust stability, water resistance, GHSV tolerance and anti-aging ability. It has been demonstrated that Cu-doping resulted in the formation of Cu-Ce solid solution and constructed a Cu-O-Ce complex active site. Benefiting from this, the redox and gaseous oxygen molecule capture & activation capabilities of the catalyst are tremendously improved via constructing abundant oxygen vacancies. The in-situ DRIFTS results revealed that CeCoCu exhibited a better C=C breaking of aromatic rings ability, a faster consumption rate of benzoate and maleic anhydride, and is less prone to accumulation of by-products, the above account for its enhanced low-temperature catalytic performance for toluene. This work may provide a new strategy to design the high-efficiency toluene oxidation catalysts.

中文翻译：

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通过 Ce2Co1Ox 纳米粒子的各种金属掺杂（Cu、Mn、Zr）构建独特的氧空位缺陷，以提高催化氧化甲苯性能


在低温下实现挥发性有机化合物（VOC）的催化氧化仍然是一个有待解决的挑战。通过构建氧空位缺陷来提高催化活性是多相催化中一种有吸引力的策略。本文采用改进的共沉淀法制备了一系列CeCoM（M=Cu、Mn、Zr）催化剂，并测量了其对甲苯的催化氧化性能。活性结果表明，掺杂金属的引入显着增强了CeCoO的催化性能，其中CeCoCu具有最佳的催化活性（T = 210 ℃）、良好的稳定性、耐水性、GHSV耐受性和抗老化能力。已证明Cu掺杂导致Cu-Ce固溶体的形成并构建了Cu-O-Ce络合物活性位点。受益于此，通过构建丰富的氧空位，催化剂的氧化还原和气态氧分子捕获和活化能力得到极大提高。原位DRIFTS结果表明，CeCoCu表现出更好的C=C芳香环断裂能力，苯甲酸酯和马来酸酐的消耗速率更快，并且不易产生副产物积累，这些都解释了其增强的低-甲苯的高温催化性能。这项工作可能为设计高效甲苯氧化催化剂提供新策略。