Novel process for improving dispersion uniformity of precious metal components

Abstract

The invention relates to a novel process for improving the dispersion uniformity of precious metal components. The novel process is characterized by comprising process steps of placing catalyst carrier particles in vacuum drying machines of rotatable vacuum drying machines and quickly adding metal salt solution with precious metal into the vacuum drying machines in vacuum states; completely purging the catalyst carrier particles, which are not immersed in solution, into the solution by compressed air and submerging all the catalyst carrier particles in the solution; allowing the vacuum dryingmachines to rotate and heating and vacuumizing the vacuum drying machines to obtain catalyst particles. The surfaces of the catalyst particles are free of visible water, and precious metal salt is adsorbed on the catalyst particles. The novel process has the advantages that catalyst carriers are in sufficient contact adsorption with the solution with the precious metal during rotation, the precious metal salt is in competitive adsorption equilibrium during still standing, precious metal catalysts further can be prepared by means of vacuum heating dehydration, accordingly, the precious metal components can be uniformly fed and dispersed in the catalyst carriers, and the comprehensive reaction performance of the catalysts can be improved.

Description

technical field [0001] The invention relates to a new process for improving the dispersion uniformity of noble metal components. Background technique [0002] Noble metal catalyst is a kind of catalytic material with noble metal components as active components, which is widely used in petrochemical industry, fine chemical industry and pharmaceutical chemical industry. Precious metals commonly used in catalysts include platinum, palladium, rhodium, silver, ruthenium, etc., among which platinum, palladium, and rhodium are the most widely used. Their electronic orbitals are not filled, the surface is easy to adsorb reactants, and the strength is moderate, which is conducive to the formation of intermediate "active compounds", has high catalytic activity, and also has comprehensive excellent properties such as high temperature resistance, oxidation resistance, and corrosion resistance. become the most important catalyst material. [0003] The impregnation process of noble meta...

AI Technical Summary

Problems solved by technology

Since the noble metal content in the noble metal catalyst is very low, the noble metal catalyst prepared by these two methods has the phenomenon that the noble metal component is in the catalyst carrier and dispersed unevenly, thus affecting the reaction performance of the catalyst

Moreover, in the former process, the residual liquid containing precious metals is discharged, which is difficult to recycle and use, which may easily cause unevenness or mutual pollution between batches; in the drying process, the time is long, the running loss is large, and the product yield is low. high consumption