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Preparation method and application of porous zeolite adsorbent

A technology of porous zeolite and adsorbent, which is applied in the field of preparation of porous zeolite adsorbent, can solve the problem of inability to enter zeolite, etc., and achieves the effects of high crystallinity, enhanced adsorption treatment, and large external surface area

Active Publication Date: 2022-02-08
JIANGSU AFX AUTOMATION ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For reactants or adsorbates with a molecular size larger than 0.8nm, the molecules can only occur on the outer surface and cannot enter the micropores of the zeolite; that is, this type of zeolite can only be used for reactants or adsorbates with a molecular size smaller than 0.8nm molecular processing

Method used

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  • Preparation method and application of porous zeolite adsorbent
  • Preparation method and application of porous zeolite adsorbent
  • Preparation method and application of porous zeolite adsorbent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The invention provides a preparation method of a porous zeolite adsorbent, the specific preparation steps are as follows:

[0030] Dissolve 5.0g of sodium hydroxide in 10g of deionized water, after fully dissolving, add 4.3g of solid silica gel, stir for 30 minutes, and record it as solution A; dissolve 1.6g of potassium fluoride in 24.1g of deionized water, fully dissolve, record Solution B; Mix solutions A and B, mix well, slowly add 12g of titanium trichloride solution and continue to stir for 2h; add 3.2mL of template agent and 9.86g of supplement to the above solution, stir for 3 hours, and obtain the reaction mixture. Glue, put in a kettle, and statically crystallize at 230°C for 72 hours; the crystallization is completed, and the sample is obtained after washing, suction filtration, drying, and calcination at 450°C for 5 hours; the molar ratio of each material of the obtained reaction mixture gel is 5.4 silica: Titanium dioxide: 4.5 Sodium oxide: 2.0 Potassium fl...

Embodiment 2

[0032] Compared to Example 1, no supplements were used in the preparation method.

Embodiment 3

[0034]Dissolve 5.2g of sodium hydroxide in 10g of deionized water, after fully dissolving, add 4.6g of solid silica gel, stir for 30 minutes, and record it as solution A; dissolve 1.9g of potassium fluoride in 26.5g of deionized water, fully dissolve, record Solution B; Mix solutions A and B, mix well, slowly add 12g of titanium trichloride solution and continue to stir for 2h; add 3.7mL of template agent and 9.86g of supplement to the above solution, stir for 3 hours, and obtain the reaction mixture. Glue, put in a kettle, and statically crystallize at 200°C for 82 hours; the crystallization is completed, and the sample is obtained after washing, suction filtration, drying, and calcination at 450°C for 5 hours; the molar ratio of each material of the obtained reaction mixture gel is 5.8 silica: Titanium dioxide: 4.7 Sodium oxide: 2.5 Potassium fluoride: 180 Deionized water: 1.5 Methacryloyloxyethyltrimethylammonium chloride: 0.7 Supplement; graphene, fluorine-containing hydrog...

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Abstract

The invention discloses a preparation method and application of a porous zeolite adsorbent, and particularly relates to the technical field of zeolite synthesis. According to the invention, solid powder silica gel with high specific surface area is used as a silicon source, sodium hydroxide is used as alkali, potassium fluoride is used as a potassium source, a titanium trichloride solution is used as a titanium source, and methacryloyloxyethyl trimethyl ammonium chloride is used as a crystal growth inhibitor; a supplement is added into the reaction mixture gel, so that the adsorption performance and the photocatalytic treatment performance of the porous zeolite adsorbent can be further enhanced; gel is prepared after mixing, and nano ETS-10 zeolite crystal grains are synthesized through hydrothermal crystallization and assembled to form the porous zeolite adsorbent with high crystallinity, large outer surface area and high mesoporous volume; and the surface of the nanocrystal is subjected to hydrophobic treatment by using a silane reagent (trimethylchlorosilane or hexamethyldisilazane), so that the hydrophobic porous zeolite adsorbent is obtained, and the hydrophobic surface is more beneficial to adsorption of molecules in VOCs.

Description

technical field [0001] The invention relates to the technical field of zeolite synthesis, more specifically, the invention relates to a preparation method and application of a porous zeolite adsorbent. Background technique [0002] ETS-10 zeolite is a new type of microporous titanium-silicon molecular sieve (US4853202) first reported by Kuznicki of Engelhard Company in 1989. The crystal structure is formed by connecting silicon-oxygen tetrahedron and titanium-oxygen hexahedron through oxygen atoms and has a twelve-membered ring. , seven-membered ring, five-membered ring, and three-membered ring, the general shape of which is a square double pyramid with the top truncated. ETS-10 has a special skeleton structure and large micropores, and the Ti in the skeleton is six-coordinated, so it has excellent ion exchange, selective adsorbent and alkali catalytic properties, and is widely used in ion exchange, adsorption, Organic base catalysis and other fields; in the invention paten...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/30B01J20/18B01J20/28B01D53/02
CPCB01J20/3078B01J20/18B01J20/28054B01J20/28011B01J20/28059B01J20/28061B01J20/28083B01J20/2808B01D53/02B01D2257/708
Inventor 陈慰盛贺绍松王海涛钟小辉周子研范宏超
Owner JIANGSU AFX AUTOMATION ENG
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