亚稳态金属/金属氧化物纳米颗粒@MOFs复合材料的合成及催化性质的研究

Metal-organic frameworks (MOFs), assembled by metal ions with organic ligands, are a class of emerging crystalline porous materials. Compared with traditional porous materials, MOFs is characterized by ultra-high pore volume and large specific surface area, adjustable pore size, regulatable chemical composition and surface functional groups, and specific metal active sites. These characteristics make MOFs widely used in a variety of fields including gas storage/separation, sensing, drug delivery, electrochemical energy conversion and especially in catalysis. In recent years, integration of metal/metal oxide nanoparticles (MNPs) into MOFs to form the composite catalysts has attracted considerable attention due to the superior performance. Previous studies have found that the composite materials formed by encapsulating metal/metal oxide nanoparticles (NPs) into MOFs can significantly improve their catalytic activities. Encapsulated metal/metal oxide nanocatalysts exhibit distinct advantages over conventional supported catalysts, especially in terms of the catalytic selectivity and stability. However, most of the currently synthesized MOFs composites are based on stable noble metal or metal oxide nano particles (NPs). It is still a great challenge to integrated MOFs with highly active but metastable metal/metal oxide nanoparticles. Design and synthesis of metastable metal/metal oxide nanoparticle composite catalysts supported by MOFs is of great significance for the development of new catalytic materials. This project intends to develop a new synthesis method to load metastable metal/metal oxide nanoparticles into MOFs to maintain their high catalytic activity while enhancing the stability of metal/metal oxide nanoparticles.

金属-有机框架(MOFs)是近年来兴起的一种有机-无机杂化晶态多孔材料，由金属离子或金属簇单元与有机配体通过配位作用组装而成，具有周期性网状结构。其最大的特点是具有超高的孔体积和超大的比表面积以及多变的结构和可修饰性。前期研究发现将金属/金属氧化物纳米颗粒(NPs)负载到MOFs里面形成的复合材料可以明显改善其催化活性，MOFs中丰富的孔道有利于物质交换与传输，多变的金属节点和配体与金属纳米颗粒协同高效实现催化反应，然而，目前合成的MOFs负载型复合催化剂大多是基于稳定的贵金属或金属氧化物纳米颗粒。而将具有高活性但稳定性较差的金属/金属氧化物纳米颗粒负载到MOFs里仍然是一个巨大的挑战。本项目拟设计开发新的的合成方法将亚稳态金属/金属氧化物纳米颗粒负载到MOFs里面以改善其高催化活性的同时增强金属/金属氧化物纳米颗粒的稳定性。

金属-有机框架(MOFs)是近年来兴起的一种有机-无机杂化晶态多孔材料，由金属离子或金属簇单元与有机配体通过配位作用组装而成，具有周期性网状结构。其最大的特点是具有超高的孔体积和超大的比表面积以及多变的结构和可修饰性。将金属/金属氧化物纳米颗粒(NPs)负载到MOFs里面形成的复合材料可以明显改善其催化活性，MOFs中丰富的孔道有利于物质交换与传输，多变的金属节点和配体与金属纳米颗粒协同高效实现催化反应，然而，目前合成的MOFs负载型复合催化剂大多是基于稳定的贵金属或金属氧化物纳米颗粒。而将具有高活性但稳定性较差的金属/金属氧化物纳米颗粒负载到MOFs里仍然是一个巨大的挑战。本项目设计开发了一系列新的的合成方法将亚稳态金属/金属氧化物纳米颗粒负载到MOFs里面以改善其高催化活性的同时增强金属/金属氧化物纳米颗粒的稳定性，并且探索了这些复合催化剂在CO2转化等催化反应中的应用。该项目发表文章4篇。