Method for preparing high-dispersion loaded-type noble-metal powder catalyst

Abstract

The invention discloses a method for preparing a high-dispersion loaded-type noble-metal powder catalyst. The method comprises the steps: (1) uniformly mixing powdery carriers with deionized water so as to form a suspension, and dissolving a noble metal precursor into deionized water so as to form an aqueous-phase solution; (2) adding the suspension into a stirring-vessel slurry reactor, carrying out stirring, and adjusting the pH value of the suspension to be alkaline; (3) atomizing the aqueous-phase solution, then, adding the atomized aqueous-phase solution into the stirring-vessel slurry reactor, precipitating noble metal ions in the form of noble metal precipitates, and enabling the precipitates to be adsorbed and deposited to surfaces of the powdery carriers in the suspension, so as to form uniform slurry; and (4) subjecting the slurry to stirring and aging at a certain temperature, anchoring the noble metal precipitates to the surfaces of the powdery carriers, then, carrying out reduction on the noble metal precipitates, and carrying out filtering and washing, thereby obtaining the high-dispersion loaded-type noble-metal powder catalyst. According to the method, the preparation process is simple and is easy to control, so that the method is suitable for industrially producing the high-dispersion loaded-type noble-metal powder catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and in particular relates to a preparation method of a highly dispersed and loaded noble metal powder catalyst. Background technique [0002] Highly dispersed and supported noble metal powder catalysts have the characteristics of high catalytic activity, good selectivity, and long cycle life. They are widely used in the fields of petrochemical, pharmaceutical, fine chemical, and organic synthesis, and play a very important role. Since 1875, the German E. Jacob established the first contact method device for the production of oleum in Kreuznach, and manufactured the required platinum catalyst, which is the pioneer of solid industrial catalysts. The precious metal platinum is the first industrial catalyst, and now precious metals are the catalytically active components in many important industrial catalysts. The highly dispersed and loaded noble metal powder catalyst is a kind of widely...

AI Technical Summary

Problems solved by technology

The preparation method can obtain highly uniform dispersion of the active metal component with a narrow particle size distribution range on the surface of the powder carrier, which effectively improves the preparation efficiency and effect of the supported noble metal powder catalyst, and solves the problem of the preparation of the production method in the prior art. Type noble metal powder catalysts have technical problems such as uneven distribution of active components, easy agglomeration, and difficulty in industrialization.

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