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Core-shell type carrier preparation method

A core-shell type, carrier technology, used in catalyst carriers, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of uneven shell thickness, easy penetration of active components, and low mechanical strength.

Active Publication Date: 2017-12-01
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

[0006] Therefore, the technical problem to be solved by the present invention is to overcome the uneven thickness of the shell layer in the prior art. When it is loaded with active components, the active components easily penetrate into the substrate, the defects of low mechanical strength, and the shell material It is not easy to cover defects on the substrate, thus providing a preparation method for core-shell carriers

Method used

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Examples

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Embodiment 1

[0026] A method for preparing a core-shell carrier, comprising:

[0027] (1) At room temperature, mix silica sol, aluminum sol, titanium 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 、TiO 2 , the mass ratio of Tianqing glue, CMC and water is 0.1:0.1:10:1:0.1:100;

[0028] (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, calcining at a temperature of 100°C for 0.5h to obtain a carrier precursor;

[0029] (3) According to the mass ratio of aluminum sol to substrate of 1:25, spray aluminum sol on the obtained carrier precursor, and roast at 300°C for 3 hours to obtain carri...

Embodiment 2

[0031] A method for preparing a core-shell carrier, comprising:

[0032] (1) At room temperature, mix silica sol, aluminum sol, titanium sol, squash gum, CMC and water, stir evenly to obtain a glue solution, wherein, in the glue solution, SiO 2 、Al 2 o 3 、TiO 2 , the mass ratio of Tianqing glue, CMC and water is 10:10:0.1:0.1:1:100;

[0033] (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, and then roll it in the sugar-coating machine for 1 hour, so that the glue solution is evenly coated on the The outside of the substrate is calcined at a temperature of 150° C. for 1 hour to obtain a carrier precursor;

[0034](3) Spray the aluminum sol on the obtained carrier precursor according to the mass ratio of the aluminum sol to the base material as 13:25, and roast at 500°C for 0.5h to ob...

Embodiment 3

[0036] A method for preparing a core-shell carrier, comprising:

[0037] (1) At room temperature, mix silica sol, aluminum sol, titanium sol, squash gum, CMC and water, stir evenly to obtain a glue solution, wherein, in the glue solution, SiO 2 、Al 2 o 3 、TiO 2 , the mass ratio of Tianqing glue, CMC and water is 1:1:1:1:1:100;

[0038] (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 The outside of the substrate is calcined at a temperature of 200°C for 1 hour to obtain a carrier precursor;

[0039] (3) According to the mass ratio of aluminum sol to substrate of 7:25, spray aluminum sol on the obtained carrier precursor, and bake it at 400°C for 2 hours to obtain carrier C. ...

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Abstract

The invention provides a core-shell type carrier preparation method, which comprises the steps of mixing silica sol, alumina sol, titanium sol, sesbania gum and sodium carboxymethyl cellulose with water to obtain a glue solution; spraying the glue solution on a base material and sintering under 100 to 200 DEG C to obtain a carrier precursor; coating the carrier precursor with shell slurry and sintering under a temperature of 300 to 500 DEG C. As a glue layer is prepared on the base material at first, roughness of the surface of the base material is improved, and the phenomenon that the shell material is prone to falling off the base material is avoided; as the glue solution with a limited proportion is chosen and utilized, not only are hole channels in the base material effectively plugged, but also mechanical strength is improved to a certain extent; the sintering temperature is controlled at 300 to 500 DEG C, so that crystal type of the shell is effectively guaranteed, and a specific surface area of the carrier is enlarged.

Description

technical field [0001] The invention relates to the field of catalyst carriers, in particular to a method for preparing a core-shell carrier. 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 specific surface by impregnation, spraying, etc., and t...

Claims

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Application Information

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IPC IPC(8): B01J21/08B01J32/00
CPCB01J21/08B01J35/396
Inventor 李新王春艳成峻青
Owner BEIJING SJ ENVIRONMENTAL PROTECTION & NEW MATERIAL CO LTD
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