PdM (M = Co, Fe, Mn)双金属纳米晶的可控制备及催化挥发性有机物氧化性能研究

挥发性有机物（VOC）是形成细颗粒物PM2.5和臭氧（O3）的重要前体物，同时直接危害人身健康。催化氧化法是消除VOC的有效途径，催化剂是实现这一过程的核心。双金属材料结构多样，拥有独特的集合效应和协同效应，在催化领域常显示出优于单一金属的催化性能。利用储量丰富的贱金属部分替代贵金属组成双金属催化材料是开发廉价高效催化剂的有效路径。但目前仍缺乏双金属组成与结构关联VOC催化氧化性能的系统研究和化学本质认识。本课题拟以Pd1-xMx (M = Co, Fe, Mn)双金属纳米晶为研究对象，以明确构效关系和筛选高性能催化剂为研究目的，重点围绕具有不同原子比例合金纳米晶的可控合成和其对典型VOC（苯系物）催化氧化的性能展开系统研究，探明双金属纳米晶催化VOC氧化的作用机制，建立反应动力学模型。研究结果可为新型高效催化材料设计和相关催化技术建立提供有益指导，为大气污染防治提供重要的科技支持。

Volatile organic compound (VOC) is one of the key precursors of fine particulate matter (PM2.5) and atmospheric ozone (O3), and is harmful to the human health. Catalytic oxidation is one of the most effective pathways to eliminate VOC, in which the catalyst is the key issue. Bimetallic materials, composed of two distinct metal elements, which often show synergistic effects and collective effects that are distinct from those of their parent metals, offer the opportunity to obtain new catalysts with enhanced catalytic performance. Incorporating abundant metals into noble metals is an effective pathway to developing active and cheap catalysts. However, it is lack of systematic study on understanding the relationship between the structure of bimetallic nanocrystals and catalytic performance of VOC oxidation as well as exploring the chemical nature. In this proposal, we shall adopt the solution-based co-reduction strategy to prepare monodisperse Pd1-xMx (M = Co, Fe, Mn) nanocrystals, and investigate the effect of the preparation conditions on the physicochemical properties of the as-obtained catalyst. The catalytic performance of supported Pd1-xMx (M = Co, Fe, Mn) samples will be evaluated for the complete oxidation of VOC. Based on the results of various characterizations, we can elucidate the “structure-performance” relationship, clarify the involved catalytic mechanisms, and establish the corresponding catalytic reaction kinetic models. It is envisioned that the results obtained in the proposed project will provide a useful guidance on designing novel catalytic materials with high performance and developing the relevant catalytic technologies, and also provide support for air pollution prevention in china.