Pt-Co合金催化剂电子和结构特性的调变及其催化氧化甲苯反应机理研究

催化燃烧法是处理挥发性有机物（VOCs）的主要技术，该技术的关键点之一是研发高性能、低成本的催化材料。贵金属-过渡金属合金催化剂因能有效提升贵金属利用率而被重点关注，但存在催化剂构效关系和活性位不明以及催化剂催化氧化VOCs反应机理不清的问题。项目拟以Pt-Co/SiO2合金催化剂催化氧化甲苯反应为研究体系，围绕催化剂的本质特性—电子和结构特性，开展以下研究：通过调控催化剂组成和热处理条件，实现合金催化剂电子和结构特性的调变，明晰电子转移和原子迁移过程对催化剂电子和结构特性的调变机制；定量分析电子和结构特性参数与甲苯催化活性之间的关联，阐明其构效关系，准确识别决定催化剂活性的本征因子；探索反应物分子在催化剂上的吸附活化机制，明确反应活性位点及关键中间物种，揭示合金催化剂催化氧化甲苯反应机理。研究成果为高活性、高利用效率的贵金属催化剂的研发提供理论基础和经验借鉴。

Catalytic combustion is the main technology for the treatment of volatile organic compounds (VOCs), and one of the key point is to develop high-performance and low-cost catalytic materials. Due to effectively improve the precious metal utilization, precious -transition metal alloy catalysts are focused. However, not only active sites and structure activity relationship of the catalysts, but also the mechanism of the catalytic oxidation of VOCs are unclear. So, the project chooses the toluene catalytic oxidation over Pt-Co/SiO2 alloy catalysts as research system, focuses on the essential characteristics of the catalyst-electronic and structural properties, and carries out the following research: 1) By regulating the catalyst composition and heat treatment conditions, adjust the alloy catalyst electronic and structural characteristics, and clear the structure characteristics of the modulation mechanism. 2) Quantitatively analyse the structure-activity relationship between the properties and catalytic activity, and accurately identify the intrinsic factors which affect catalyst activity. 3) Explore the adsorption and activation mechanism of reactant molecule on the catalyst, identify reactive sites and key intermediate species, and reveal the effect of electronic and structural properties on the mechanism of toluene catalytic oxidation. The research results would provide theoretical basis and experience for the development of noble metal catalysts with high activity and utilization efficiency.