Preparation method of MOFs nano material supporting nano metal particles

Abstract

The invention provides a preparation method of a MOFs nano material supporting nano metal particles. The method comprises the following steps: step 1: uniformly mixing a 2-methylimidazole methanol solution and a zinc nitrate methanol solution, and carrying out standing to obtain ZIF-8 particles with uniform distribution of particle diameters; step 2: dispersing the ZIF-8 in a methanol solution containing cobalt nitrate, 2-methylimidazole and metal nano particles, carrying out ultrasonic treatment and uniform stirring, and carrying out a reaction to obtain purple solid powder; and step 3: dispersing the purple solid powder in a methanol solution of zinc nitrate and 2-methylimidazole, carrying out ultrasonic treatment and uniform stirring, carrying out a reaction, and carrying out washing and drying after the reaction is finished, so as to obtain the MOFs nano material supporting nano metal particles with a sandwich structure. The preparation method has cheap and easily obtained raw materials, mild and controllable conditions, and no pollution to the environment; the synthesized MOFs nano material supporting metal nano particles has a sandwich structure, and the supported metal is uniformly dispersed in the interlayer, so that the stability and selectivity of the catalyst are improved.

Description

technical field [0001] The invention belongs to the technical field of inorganic chemical synthesis, and in particular relates to a preparation method of MOFs nanometer material loaded with nanometer metal particles. Background technique [0002] In recent years, metal organic frameworks (MOFs, metal organic frameworks) have attracted much attention due to their unique properties in gas storage and separation. Combined with the high activity of nano-metal catalysis and the high specific surface area, developed pore structure and special coordination environment of MOFs, the synthesis and preparation of composite materials of nano-metal particles and MOFs has become a current research hotspot. [0003] At present, the reported composite structures of metal nanoparticles and MOFs include core-shell structure, mosaic structure, etc., but the molecules used in these synthetic materials are terephthalic acid, and the resulting catalysts are not stable enough. ZIF series material...

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Problems solved by technology

[0003] At present, the reported composite structures of metal nanoparticles and MOFs include core-shell structure, mosaic structure, etc., but the molecule used in these synthetic materials is terephthalic acid, and the stability of the obtained catalyst is not enough.

ZIF series materials, especially ZIF-8, have high structural stability, and it is of great significance to use them in the synthesis of metal MOFs composite materials. However, most of the metal and ZIF-8 composite structures reported so far are mosaic structures. As well as the core-shell structure, the nanoparticles in the mosaic structure exist in the pores of ZIF-8, which can improve the selectivity of the catalytic reaction, but also hinder the mass transfer process and reduce the catalytic activity. Although the core-shell structure material improves the mass transfer efficiency, but because the distribution of nanoparticles in ZIF-8 cannot be well controlled, the nanoparticles are easy to agglomerate, and the synthesis of a MOFs material with a sandwich structure can take into account the advantages of the above two structures

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