超细过渡金属@Pt核壳结构催化剂的构建及其催化氧化VOCs性能研究

催化氧化法是工业挥发性有机物(VOCs)达标治理的主流技术之一。本项目基于我国在大气污染控制领域的迫切需求，针对现有催化体系存在的选择性差、稳定性不足和贵金属用量大的问题，探索解决方案。项目拟构建负载型贵金属‒过渡金属核壳结构催化剂，重点围绕具有不同外层(超细/超薄)贵金属分布形式以及不同种类过渡金属核的核壳纳米晶及其负载型催化剂对单一及多组分VOCs催化氧化的性能，污染物在催化剂表面的转化路径，展开系统研究。探明核壳催化剂催化VOCs氧化的作用机制。项目拟解决的关键问题包括：(1) 探究单一组分污染物分子在双金属催化剂上的氧化路径以及双金属协同作用机制；(2) 揭示双组份污染物分子在催化剂表面的竞争/协同反应机制。从而实现对于降低毒副产物生成、提高催化稳定性及降低材料成本的催化剂物化性质调控规律的理性认知。为VOCs控制提供科学依据，推动工业VOCs减排技术创新，具有理论意义和实际价值。

Catalytic oxidation is considered as the major technology for volatile organic compounds (VOCs) removal. Based on the urgent demand in the field of air pollution control in china, this project gives an in-depth study onto the catalytic processes, with an aim to solve the existing problems for industrial catalysts with poor selectivity, insufficient catalytic stability and using large amount of precious metal. In this proposal, we prepare the supported noble metal-transition metal core-shell catalysts with ultrathin noble metal exposed, and investigate the effect of the preparation conditions on the VOCs catalytic oxidation performance of the as-obtained catalyst. Based on the results of various characterizations, we can elucidate the “structure-performance” relationship and the transformation process of VOCs on the catalyst, clarify the involved catalytic mechanisms. The key issues to be solved in this project include: (1) the regulation law of pollutant oxidation route will be constructed via catalyst physicochemical property optimization, while the function of bimetallic active sites are further revealed; (2) explore the competition and/or synergy reaction‒transformation mechanism of the two kinds of typical VOCs on the bimetallic catalysts surface. The research will provide new ideas and scientific basis for industrial VOCs control, and further promotes the technology innovation and progress for industrial VOCs highly-efficient elimination, which have important theoretical significance and practical value.