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Pore-diameter-adjustable alumina carrier and preparation method thereof

A technology of alumina carrier and pore size, which is applied in the direction of catalyst carrier, preparation with chloride, chemical instruments and methods, etc., can solve the problems of pore blockage and preparation technology of macroporous alumina carrier, and achieve high mechanical strength and low load relief , Improve the effect of catalytic activity

Inactive Publication Date: 2020-11-17
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, in the research of hydrogen chloride catalytic oxidation catalyst support, there is no macroporous alumina support preparation technology that can not only solve the pore blockage but also maintain a certain mechanical strength.

Method used

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  • Pore-diameter-adjustable alumina carrier and preparation method thereof
  • Pore-diameter-adjustable alumina carrier and preparation method thereof
  • Pore-diameter-adjustable alumina carrier and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Raw materials for carrier preparation: parts by weight

[0037]

[0038] (2) The preparation method of the alumina carrier with adjustable pore size:

[0039] Mix pseudo-boehmite powder, silicon dioxide powder, squeezer celadon powder, and squeezer methylcellulose evenly, add peptizer water and peptizer aluminum sol, knead for 30 minutes, and extrude to form granules , dried at 100°C for 2 hours, and calcined at 350°C for 2 hours to obtain a pre-calcined alumina carrier;

[0040] Get 30 parts by weight of the pre-calcined carrier, spray 15 parts by weight of a citric acid solution with a concentration of 10 wt% evenly on the surface of the particles, and then evenly spray 10 parts by weight of a citric acid solution with a concentration of 15 wt% on the surface of the particles, Stand at room temperature for 2 hours, dry at 150°C for 2 hours, and bake at 800°C for 5 hours to obtain the alumina support with adjustable pore size;

[0041] The specific surface are...

Embodiment 2

[0043] (1) Raw materials for carrier preparation: parts by weight

[0044]

[0045] (2) Preparation method of alumina carrier with adjustable pore size The operations of carrier kneading, extrusion, drying and pre-calcination are the same as in Example 1.

[0046] Get 30 parts by weight of the pre-baked carrier, spray 15 parts by weight of a citric acid solution of 5 wt% evenly on the surface of the particles, then evenly spray 10 parts by weight of a citric acid solution of 15 wt% on the surface of the particles, and let it stand at room temperature 2h, dry at 150°C for 2h, and bake at 800°C for 5h. The specific surface area of ​​the obtained alumina carrier is 217m 2 / g, the average pore diameter at the pore center-50% particle diameter is 10.6nm, the average pore diameter at the 50%-80% particle diameter is 13.1nm, and the average pore diameter at the 80%-outer surface is 14.9nm. The strength is 99N / cm.

Embodiment 3

[0048] (1) Raw materials for carrier preparation: parts by weight

[0049]

[0050]

[0051] (2) The preparation method of the alumina carrier with adjustable pore size:

[0052] The kneading, extrusion, drying and pre-calcination operations of the carrier are the same as in Example 1.

[0053]Take 30 parts by weight of the pre-calcined carrier, spray 15 parts by weight of an acetic acid solution with a concentration of 10wt% evenly on the surface of the particles, and then evenly spray 10 parts by weight of an acetic acid solution with a concentration of 15wt% on the surface of the particles. Let stand for 1h, dry at 150°C for 2h, and bake at 750°C for 4h. The specific surface area of ​​the obtained alumina carrier is 197m 2 / g, the average pore diameter at the channel center-50% particle diameter is 12.9nm, the average pore diameter at the 50%-80% particle diameter is 15.4nm, and the average pore diameter at the 80%-outer surface is 16.8nm. The strength is 108N / cm. ...

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Abstract

The invention discloses a pore-diameter-adjustable alumina carrier and a preparation method thereof. The particle inner pore diameter of the alumina carrier is gradually increased from the center to the outer surface along the radial direction; the pore diameter at the particle center of the alumina carrier is 1-8 nm smaller than the average pore diameter at a 50%-particle-diameter position; the average pore diameter at the 50%-particle-diameter position is about 1-5 nm smaller than that at a 80%-particle-diameter position; the average pore diameter at the 80%-particle-diameter position is about 1-5 nm smaller than that of the outer surfaces of the particles; the water absorption rate is 65%-75%, the specific surface area is 120-220 m<2> / g, the pore volume is 0.6-0.8 mL / g, and the pore diameter distribution is 10-20 nm. The pore diameters are in a horn-shaped distribution state that the pore diameters are gradually increased from the particle center to the outer surface in the radial direction, and compared with a carrier with pores distributed in a centralized mode, the problem that the active component loading capacity is low due to blockage of pores in the outer surface can be effectively solved, the catalytic activity of the catalyst is improved, and the pore diameter of the carrier can be conveniently and randomly adjusted.

Description

technical field [0001] The present invention relates to alumina supports for use in catalytic hydrogen chloride oxidation processes. Background technique [0002] As early as more than 100 years ago, people began to study the method of converting hydrogen chloride into chlorine gas. So far, the methods for preparing chlorine gas from hydrogen chloride can be mainly divided into three types: electrolysis, direct oxidation and catalytic oxidation. At present, industrialization and stability have been realized. Only the hydrochloric acid electrolysis method of German Wood and the catalytic oxidation method of Sumitomo Chemical of Japan are in operation. However, the electrolytic method has high operating costs, large investment, and is very sensitive to impurities in the raw material of hydrochloric acid, while the by-product hydrogen chloride gas or hydrochloric acid contains more or less other impurities, so the electrolytic chlorine production technology of hydrochloric acid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J32/00B01J35/10B01J37/08C01B7/04
CPCB01J21/04B01J37/08C01B7/04B01J35/615B01J35/635B01J35/647
Inventor 葛琪敏梅倩雯袁茂全崔巍陈斌武马斌全孙策张建
Owner SHANGHAI CHLOR ALKALI CHEM