Preparation method of eggshell-shaped deoxidization catalyst

A deoxidation catalyst, eggshell-type technology, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of low utilization rate of catalyst active components and catalyst efficiency Low cost, large amount of precious metals used, etc., to avoid agglomeration and sintering, easy to operate, and improve the effect of utilization

Active Publication Date: 2017-09-22
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 defect that the preparation method is more tedious, and then provide a kind of simple preparation method of eggshell type deoxidation catalyst, the precious metal loading capacity in the eggshell type deoxygenation catalyst prepared by this method is high and can be highly dispersed on the surface of the carrier

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  • Preparation method of eggshell-shaped deoxidization catalyst

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Embodiment 1

[0030] The preparation method of the eggshell type deoxidation catalyst provided in this embodiment comprises the following steps:

[0031] Preparation molar concentration is the palladium nitrate aqueous solution of 0.01mol / L, then above-mentioned palladium nitrate aqueous solution is added in the glue solution, the mass ratio of described palladium nitrate aqueous solution and described glue solution is 1:8, obtains precious metal salt glue solution, then Adding an aqueous solution of hydrazine hydrate with a mass concentration of 50 g / L to the noble metal salt gel solution to obtain a noble metal active component precursor solution;

[0032] Wherein, the molar ratio of the palladium nitrate to the hydrazine hydrate is 1:2, and the glue is composed of a mass ratio of SiO 2 :Al 2 o 3 : TiO 2 : Tianqing gum: sodium carboxymethyl cellulose: water = 10: 0.5: 10: 0.1: 1: 100 is prepared by mixing evenly;

[0033] Using the noble metal active component precursor solution to im...

Embodiment 2

[0035] The preparation method of the eggshell type deoxidation catalyst provided in this embodiment comprises the following steps:

[0036] Prepare a palladium chloride aqueous solution with a molar concentration of 0.02mol / L, then add the above-mentioned palladium chloride aqueous solution to the glue, and the mass ratio of the palladium chloride aqueous solution to the glue is 1:15 to obtain a noble metal salt glue solution, and then adding a formaldehyde solution with a mass concentration of 5g / L to the noble metal salt glue solution to obtain a noble metal active component precursor solution;

[0037] Wherein, the molar ratio of the palladium chloride to the formaldehyde is 1:1.5, and the glue is composed of a mass ratio of SiO 2 :Al 2 o 3 : TiO 2 : Tianqing gum: sodium carboxymethyl cellulose: water = 10: 0.1: 10: 0.1: 1: 100 is prepared by mixing evenly;

[0038] Using the noble metal active component precursor solution to impregnate δ-Al 2 o 3 Spherical carrier, i...

Embodiment 3

[0040] The preparation method of the eggshell type deoxidation catalyst provided in this embodiment comprises the following steps:

[0041] Prepare a palladium chloride aqueous solution with a molar concentration of 0.001mol / L, then add the above-mentioned palladium chloride aqueous solution to the glue, and the mass ratio of the palladium chloride aqueous solution to the glue is 1:2 to obtain a noble metal salt glue solution, and then adding an aqueous formic acid solution with a mass concentration of 30 g / L to the noble metal salt gel solution to obtain a noble metal active component precursor solution;

[0042] Wherein, the molar ratio of the palladium chloride to the formic acid is 1:2.5, and the glue is composed of a mass ratio of SiO 2 :Al 2 o 3 : TiO 2 : Tianqing gum: sodium carboxymethyl cellulose: water = 0.1: 10: 0.1: 1: 0.1: 100 is prepared by mixing evenly;

[0043] Using the noble metal active component precursor solution to impregnate θ-Al 2 o 3 Spherical c...

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Abstract

The invention provides a preparation method of an eggshell-shaped deoxidization catalyst. The preparation method comprises the following steps: adding a water solution of soluble noble metal salt into a 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; immersing or spraying the precursor solution to a spherical carrier; drying and roasting to prepare the eggshell-shaped deoxidization catalyst. The method provided by the invention has a simple process and is convenient to operate; 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 and the catalysis efficiency of the catalyst is improved; meanwhile, the utilization amount of the noble metal can also be reduced.

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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/44C01B21/04
CPCB01J23/44B01J35/008B01J37/0009B01J37/024C01B21/04C01B2210/0045
Inventor 李新王春艳成峻青
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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