Preparation method of eggshell catalyst

A technology of eggshell-type catalysts and active components, applied in chemical instruments and methods, physical/chemical process catalysts, heterogeneous catalyst chemical elements, etc., can solve the problem of low utilization rate of catalyst active components, low catalyst efficiency, precious metal To avoid agglomeration and sintering, to facilitate operation and to improve utilization rate due to problems such as large usage

Active Publication Date: 2017-08-18
BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the fact that in the existing methods for preparing eggshell catalysts, it is inevitable that some precious metals will diffuse into the interior of the carrier, resulting in low utilization rate of active components of the catalyst, low catalytic efficiency of the catalyst, large amount of precious metals used and The preparation method is relatively cumbersome, and a simple preparation method of eggshell catalyst is provided. The eggshell catalyst prepared by this method has a high loading capacity of precious metals and can be highly dispersed on the surface of the carrier

Method used

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  • Preparation method of eggshell catalyst

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Embodiment 1

[0030] The preparation method of the eggshell catalyst provided by the present embodiment comprises the following steps:

[0031] Prepare a palladium nitrate aqueous solution with a mass percentage of 10%, then add the above-mentioned palladium nitrate aqueous solution to the glue solution, the mass ratio of the palladium nitrate aqueous solution to the glue solution is 1:9, and mix evenly to obtain the metal active Component precursor solution; The glue solution is SiO by mass ratio 2 :Al 2 o 3 : TiO 2 : Tianqing gum: Sodium carboxymethyl cellulose: Water = 10:0.1:10:0.1:0.1:100 The ratio is prepared after mixing evenly;

[0032] Using the metal active component precursor solution to impregnate α-Al 2 o 3 Spherical carrier, in this example, 50g spherical carrier requires 200mL metal active component precursor solution, impregnated 4 times, each time 1h, dried naturally, dried at 80°C for 2.5h, then calcined at 400°C for 3h , to obtain catalyst A.

Embodiment 2

[0034] The preparation method of the eggshell catalyst provided by the present embodiment comprises the following steps:

[0035]Prepare a ruthenium chloride aqueous solution with a mass percentage content of 3%, and then add the above-mentioned ruthenium chloride aqueous solution to the glue solution, the mass ratio of the ruthenium chloride aqueous solution to the glue solution is 1:2, and mix evenly, that is Obtain metal active component precursor solution; Described glue is to be SiO by mass ratio 2 :Al 2 o 3 : TiO 2 : Tianqing gum: sodium carboxymethyl cellulose: water = 0.1: 10: 0.1: 0.1: 1: 100 is prepared by mixing evenly;

[0036] Using the metal active component precursor solution to impregnate δ-Al 2 o 3 Spherical carrier, in this example, 50g spherical carrier needs 500mL metal active component precursor solution, impregnated 3 times, the time of each immersion is 1.5h, dry naturally, after drying at 50°C for 3h, calcined at 300°C 2h, catalyst B was obtained....

Embodiment 3

[0038] The preparation method of the eggshell catalyst provided by the present embodiment comprises the following steps:

[0039] Prepare a rhodium chloride aqueous solution with a mass percentage content of 20%, then add the above-mentioned rhodium chloride aqueous solution to the glue, the mass ratio of the rhodium chloride aqueous solution to the glue is 1:19.5, mix evenly, that is Obtain metal active component precursor solution; Described glue is to be SiO by mass ratio 2 :Al 2 o 3 : TiO 2 : Tianqing gum: Sodium carboxymethyl cellulose: Water = 0.1:1:1:0.1:0.2:100 The ratio is prepared after mixing evenly;

[0040] Using the metal active component precursor solution to impregnate θ-Al 2 o 3 Spherical carrier, in this example, 50g spherical carrier needs 300mL metal active component precursor solution, impregnated 5 times, the time of each immersion is 0.5h, dried naturally, dried at 120°C for 2h, then calcined at 500°C for 4h , to obtain catalyst C.

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Abstract

The invention provides a preparation method of an eggshell catalyst. A water solution of soluble metal salt is added to a glue solution, an active component precursor solution is prepared and then is used for soaking spherical carriers or sprayed to the spherical carriers, and the eggshell catalyst can be conveniently prepared through drying and calcination. The method adopts a simple process and is convenient to operate. A viscous glue solution in the precursor solution can prevent metal active components from dispersing towards the insides of the carriers, so that metal can be supported on the surfaces of shell layers of the carriers, the utilization rate of the active components is further increased, the catalysis efficiency of the catalyst is improved, and meanwhile, the use amount of metal is reduced; besides, the viscous glue solution can prevent the active components from agglomerating and sintering, the active components are promoted to be highly dispersed on the surfaces of the shell layers of the carriers, and the catalytic activity of the catalyst 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 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-mentioned deoxidatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/42B01J23/44B01J23/46B01J35/08
CPCB01J23/42B01J23/44B01J23/462B01J23/464B01J35/008B01J35/08B01J2523/00B01J2523/31B01J2523/41B01J2523/47B01J2523/824B01J2523/821B01J2523/822B01J2523/828
Inventor 李新王春艳成峻青
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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