Preparation method for synthesizing spherical-shell-type stable metal nano catalyst by one-pot method

Abstract

The invention relates to the field of catalyst synthesis, in particular to a preparation method for synthesizing a spherical-shell-type stable metal nano catalyst by a one-pot method. The catalyst prepared by the method is obtained mainly by the following steps: performing hydrolytic polymerization by using ethyl orthosilicate, resorcinol and formaldehyde as raw materials in an ethanol water reaction system under the catalysis action of ammonia water to form a spherical-shell-type material of phenolic resin coated silicon dioxide, directly adding a material salt as a metal precursor in the material preparation process, performing hydrothermal synthesis, performing centrifugal washing, performing filtration, performing drying to obtain a catalyst precursor, and performing carbon thermal reduction calcination at different temperatures in a nitrogen atmosphere to obtain the corresponding catalyst. Compared with a catalyst prepared by using single silicon dioxide or phenolic resin pelletsas a carrier or a conventional impregnation method, and the catalyst provided by the invention has a simple and convenient catalytic process, a better catalytic effect, more uniformly-distributed supported metal nanoparticles, smaller particle sizes, higher catalytic hydrogenation activity and improved catalyst stability.

Description

technical field [0001] The invention relates to the field of catalytic chemistry, in particular to a preparation method of a stable metal nano-catalyst, which is suitable for the preparation of a stable metal nano-catalyst supported by a carbon-containing carrier or a carbon-coated oxide carrier, and provides a strategy for stabilizing metal nano-particles. Background technique [0002] Due to their high catalytic activity, transition metal catalysts are widely used in the fields of biomass catalytic conversion and organic synthesis, especially metal catalysts such as ruthenium, rhodium, palladium, platinum, copper, cobalt, nickel, etc. Hydrogen activity has been widely used and important research in catalytic hydrocracking. Supported metal nanocatalysts can adjust the catalytic activity and selectivity by adjusting the properties of active component additives or supports, while the stability of catalysts has some problems and challenges in practical applications, such as ch...

AI Technical Summary

Problems solved by technology

However, this preparation method still requires chemical or gas reduction to obtain metal nanocatalysts. Although this spatial confinement prevents the aggregation and growth of metal particles to a certain extent, it also limits the reaction substrate and activity to a certain extent. Contact of metal components

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