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基于原位红外技术的Co3O4/CeO2催化剂低温催化甲苯研究
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Abstract:
利用原位红外表征技术研究了高效自组装双金属Co3O4/CeO2复合催化剂低温催化燃烧甲苯的机理与反应路线。表征显示，甲苯低温催化燃烧的关键是甲苯氧化的中间产物低级羧酸盐进一步氧化为碳酸盐。催化性能的促进作用主要归因于Co和Ce活性位点之间的相互作用引起的C-H键的活化，氧迁移率的提高和中间产物的快速转移。并通过原位红外大致推断出了反应过程：吸附态甲苯→苯甲醛→苯甲酸→高级脂肪酸→小分子羧酸→碳酸盐物质(CO2和H2O)。
In situ DRIFT characterization technology was used to analyze the mechanism and reaction route of high-efficiency self-assembled bimetallic Co3O4/CeO2 composite catalyst for low-temperature catalytic combustion of toluene. Characterization indicates that the key to low-temperature catalytic combustion of toluene is the further oxidation of the intermediate products of toluene oxidation to carbonates. The promotion of catalytic performance is mainly attributed to the activation of the C-H bond caused by the interaction between the active sites of Co and Ce, the improvement of oxygen mobility and the rapid transfer of intermediate products. The reaction process was roughly deduced by in-situ infrared: adsorbed toluene → benzaldehyde → benzoic acid → higher fatty acid → small molecule carboxylic acid → carbonate material (CO2 and H2O).
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