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Preparation method of core-shell type carrier using gamma-Al2O3 as shell layer

A technology of core-shell type and carrier, which is applied in the field of preparation of core-shell type carrier, which can solve the problems of low mechanical strength and small specific surface area

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

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problem of using γ-Al in the prior art 2 o 3 It is a defect with small specific surface area and low mechanical strength in the loaded carrier of the shell layer, thus providing a γ-Al 2 o 3 The preparation method of the core-shell type carrier that is shell layer

Method used

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  • Preparation method of core-shell type carrier using gamma-Al2O3 as shell layer
  • Preparation method of core-shell type carrier using gamma-Al2O3 as shell layer
  • Preparation method of core-shell type carrier using gamma-Al2O3 as shell layer

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Embodiment 1

[0025] A γ-Al 2 o 3 A preparation method for a core-shell carrier of the shell, comprising:

[0026] (1) At room temperature, mix silica sol, aluminum sol, squash gum, CMC (sodium carboxymethyl cellulose) and water, and stir evenly to obtain a glue solution, wherein, in the glue solution, SiO 2 、Al 2 o 3 , the mass ratio of Tianqing glue, CMC and water is 0.1:0.1:1:0.1:100;

[0027] (2) Choose a spherical α-Al with a diameter of 2mm 2 o 3 Put the base material in a sugar coating machine, spray the glue solution on the base material with the mass ratio of the glue solution and the base material being 1:25, and then roll it in the sugar coating machine for 0.5h to coat the glue solution evenly On the outside of the substrate, the carrier precursor is obtained, and γ-Al is sprayed on the carrier precursor 2 o 3 powder; among them, γ-Al 2 o 3 The particle size of the powder is 400 mesh;

[0028] (3) Spraying γ-Al 2 o 3 After powdering, calcined at 300°C for 3 hours to...

Embodiment 2

[0030] A γ-Al 2 o 3 A preparation method for a core-shell carrier of the shell, comprising:

[0031] (1) At room temperature, mix silica sol, aluminum sol, squash gum, CMC and water, and stir evenly to obtain a glue solution, wherein, in the glue solution, SiO 2 、Al 2 o 3 , the mass ratio of Tianqing glue, CMC and water is 10:10:0.1:1:100;

[0032] (2) Select a spherical δ-Al with a diameter of 5mm 2 o 3 Place the base material in a sugar-coating machine, spray the glue solution onto the base material in an amount of 13:25 in mass ratio between the glue solution and the base material, then roll it in the sugar-coating machine for 3 hours, so that the glue solution can be evenly coated on the Outside the substrate, the carrier precursor is obtained, and γ-Al is sprayed on the carrier precursor 2 o 3 powder; among them, γ-Al 2 o 3 The particle size of the powder is 500 mesh;

[0033] (3) Spraying γ-Al 2 o 3 After powdering, calcined at 500°C for 0.5h to obtain carrier...

Embodiment 3

[0035] A γ-Al 2 o 3 A preparation method for a core-shell carrier of the shell, comprising:

[0036] (1) At room temperature, mix silica sol, aluminum sol, squash gum, CMC and water, and stir evenly to obtain a glue solution, wherein, in the glue solution, SiO 2 、Al 2 o 3 , the mass ratio of Tianqing glue, CMC and water is 1:1:1:1:100;

[0037] (2) Choose a spherical θ-Al with a diameter of 3mm 2 o 3 Place the base material in a sugar coating machine, spray the glue solution onto the base material in an amount of 7:25 in the mass ratio of the glue solution to the base material, and then roll it in the sugar coating machine for 1 hour, so that the glue solution can be evenly coated on the Outside the substrate, the carrier precursor is obtained, and γ-Al is sprayed on the carrier precursor 2 o 3 powder; among them, γ-Al 2 o 3 The particle size of the powder is 400 mesh;

[0038] (3) Spraying γ-Al 2 o 3 After being powdered, it is calcined at 400°C for 2 hours to ob...

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Abstract

The invention provides a preparation method of a core-shell type carrier using gamma-Al2O3 as a shell layer. The preparation method comprises the following steps of coating a substrate with a glue liquid; spraying the gamma-Al2O3 powder, and roasting at the temperature of 300 to 500 DEG C. The preparation method has the advantages that firstly, the glue liquid is applied, and then the gamma-Al2O3 powder is sprayed, so that the gamma-Al2O3 powder can be uniformly distributed at the substrate surface, and the uniformity of the thickness of the gamma-Al2O3 shell layer is effectively guaranteed; the mechanical strength of the core-shell type carrier using the gamma-Al2O3 as the shell layer is obviously enhanced, and can reach 170N per particle; the gamma-Al2O3 shell layer of the core-shell type carrier has higher specific surface area, and the specific surface area can reach 390g / m<2>; a catalyst prepared by the core-shell type carrier has higher catalyzing activity.

Description

technical field [0001] The invention relates to the field of catalyst supports, in particular to a γ-Al 2 o 3 The preparation method of the core-shell type carrier which is the shell layer. Background technique [0002] As the chemical industry continues to develop in the direction of environmental protection, energy saving and high efficiency. The performance requirements for catalysts are also constantly increasing. Supported catalysts are widely used for their high catalytic activity and good selectivity. Among them, supported catalysts with noble metals as active components are the most widely used, especially in petrochemical industry, noble metal supported catalysts are widely used in gas purification, raw material hydrogenation, cracking and other processes due to their excellent catalytic performance. The most commonly used method for preparing noble metal-supported catalysts is to directly support the noble metal active components on a carrier with a large speci...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J21/12B01J23/42B01J35/08B01D53/86B01D53/46
CPCB01D53/8671B01J21/04B01J21/12B01J23/002B01J23/42B01D2257/104B01J35/397B01J35/51
Inventor 李新王春艳成峻青
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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