Preparation method for high-activity metal organic framework material

Abstract

The invention discloses a preparation method for a high-activity metal organic framework material. The method includes the steps: (1) preparing a metal precursor solution A; (2) preparing an organic ligand solution B; (3) sending the solution A and the solution B into a micro channel reactor module I, and generating an MOFs crystal seed in situ; (4) dissolving a metal in a state of metal powder, nano oxide or metal salt to obtain a solution C, when the material liquid obtained in the step (3) enters a module II, sending the solution C into the module II, and carrying out a metal ion in-situ synthesis reaction; (5) allowing the material liquid of the step (4) to enter a module III, sending the solution B into the module III, and carrying out crystal seed induced synthesis; (6) when the material liquid of the step (5) enters a module IV, sending a light reduction sacrificial agent D into the module IV; (7) when the material liquid obtained in the step (6) enters a module V, carrying out metal reduction reaction by sun illumination; and (8) carrying out solid-liquid separation, washing, and drying to obtain the product. The MOFs material prepared by the multi-module micro channel reactor has the advantages of simple and fast preparation process and good product activity.

Description

technical field [0001] The invention relates to a method for preparing a metal organic framework material, in particular to a method for preparing a highly active metal organic framework material using a microchannel reactor. Background technique [0002] Metal-organic frameworks (MOFs), also known as metal coordination polymers, refer to crystalline materials formed by connecting inorganic metals or metal clusters with nitrogen-oxygen-containing multidentate organic ligands through coordination bonds. Surface area, adjustable pore size, organically functionalized porous material. Compared with conventional porous materials, metal organic framework materials have the following advantages: (1) regulate the length and size of organic ligands, and effectively control the texture properties of materials (specific surface area, pore size); Volume; (3) High content of metal ions on the surface of pores or framework, high availability. [0003] However, the metal ions of MOFs pro...

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Problems solved by technology

Conventional metal-organic framework materials have poor thermal stability. After the introduction of noble metal ions, metal-organic framework materials with high activity can be obtained through the conventional high-temperature hydrogen reduction reaction. The general processing temperature is 200-800 ° C, which is much higher than most metal-organic framework materials The temperature resistance of framework materials limits the application of metal-organic framework materials to support noble metals to prepare highly active catalysts

[0005] Patents CN103191778 and CN103752276 introduce the method of introducing metal ions on metal organic framework materials to prepare high-activity catalyst / adsorbent by post-synthesis method. The catalyst / adsorbent prepared by this method has good metal dispersion and high activity, which broadens the scope of metal The practical application of organic framework materials, but the impregnation method introduces low metal content and poor stability, which reduces the industrial application value of the material

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