Preparation method of eggshell-shaped deoxidization catalyst

Abstract

The invention provides a preparation method of an eggshell-shaped deoxidization catalyst. The preparation method comprises the following steps: firstly, immersing or spraying a glue solution to a spherical carrier so as to form a glue layer on the outer part of the spherical carrier; then coating the glue layer with a porous material; drying and roasting to obtain a shell-layer compound carrier; adding a water solution of soluble noble metal salt into the glue solution to prepare a noble metal salt glue solution; then adding a reducing agent water solution into the noble metal salt glue solution to prepare a noble metal active component precursor solution; finally, immersing or spraying the precursor solution to the shell-layer compound carrier; drying and roasting to prepare the eggshell-shaped deoxidization catalyst. According to the preparation method provided by the invention, the precursor solution contains the sticky glue solution and can prevent noble metal active components from being dispersed into the carrier, so that noble metal is loaded on the surface of a shell layer of the carrier as much as possible, and furthermore, the utilization rate of the active components is improved.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and in particular relates to a preparation method of an eggshell-type deoxidation catalyst. Background technique [0002] The rapid development of electronics industry, semiconductor materials, modern chemical industry, metallurgy, instrumentation, aerospace and atomic energy and other industries requires more and more high-purity gases, such as high-purity hydrogen, chlorine, nitrogen and carbon dioxide, etc. The purification of these gases usually involves deoxidation process. At present, the methods of purifying and removing impurity oxygen from high-purity gas mainly adopt variable-valence oxide absorption method, carbon combustion consumption method and hydrogenation catalytic conversion method. Among them, the deoxidation catalyst commonly used in the variable price oxide absorption method is manganese oxide, copper oxide or silver oxide, etc., but the deoxidation amount of the above-men...

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Problems solved by technology

[0006] The technical problem to be solved by the present invention is to overcome that the existing methods for preparing eggshell-type deoxidation catalysts will inevitably cause some precious metals to diffuse into the interior of the carrier, resulting in low utilization of catalyst active components, low catalytic efficiency of catalysts, and large consumption of precious metals. And the preparation process of the catalyst carrier has the disadvantage of high calcination temperature, and then provides a method for preparing an eggshell-type deoxidation catalyst. The eggshell-type deoxidation catalyst prepared by this method has a high loading of precious metals and can be highly dispersed on the surface of the carrier.

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