Preparation method of high-performance noble metal catalyst

Abstract

The invention discloses a preparation method of a high-performance noble metal catalyst. The method comprises the following steps: 1, adding polyvinylpyrrolidone to anhydrous ethanol, performing stirring until the polyvinylpyrrolidone is completely dissolved, then adding sodium percarbonate, performing mixing, and carrying out a reduced pressure distilling reaction for 2-4 h to obtain a viscous slurry; 2, adding tourmaline powder to the viscous slurry, performing ultrasonic dispersion for 20-60 min, adding the obtained material into a mold, and carrying out constant-temperature pressurizing curing to obtain a prefabricated block; 3, adding the prefabricated block to anhydrous ethanol, and carrying out microwave soaking for 30-60 min to obtain a residual liquid and a porous block; 4, addingpalladium acetate to the residual liquid, performing ultrasonic dispersion for 2-10 min, and carrying out reduced pressure distillation to form a concentrated liquid; 5, adding the porous block to the concentrated liquid, taking out the porous block, drying the porous block, and carrying out infrared drying for 2-5 h to obtain a prefabricated block; and 6, adding the finally obtained prefabricated block to acetic acid, carrying out an ultrasonic reaction for 20-40 min, taking out the prefabricated block, and drying the prefabricated block to obtain the catalyst. The preparation method has theadvantages of strong feasibility, high recyclability and reusability of the anhydrous ethanol, and meeting of national environmental protection requirements.

Description

technical field [0001] The invention belongs to the field of noble metals, and in particular relates to a preparation method of a high-performance noble metal catalyst. Background technique [0002] Noble metal Au, Pt, and Pd nanocatalysts have excellent catalytic effects in selective oxidation, selective hydrogenation, and coupling reactions. Therefore, the preparation of highly dispersed noble metal catalysts has attracted great attention from researchers. Studies have found that the catalytic activity of noble metal nanocatalysts largely depends on the size and shape of noble metal nanoparticles. When the size of noble metal nanoparticles is less than 10nm, its catalytic activity is very strong, and as the size increases, its activity gradually weakens. Therefore, it is a difficult problem to prepare small particles and highly dispersed noble metal nanoparticle catalysts. [0003] The catalytic activity of noble metal nanocatalysts is limited by their size, and they tend...

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Problems solved by technology

[0005] Aiming at the problems in the prior art, the present invention provides a method for preparing a high-performance noble metal catalyst, which solves the problem of serious particle agglomeration of the existing noble metal catalyst, and also solves the problem that the existing noble metal carrier does not have the functions of pretreatment and deactivation prevention specialty

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