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Method for synthesizing mesoporous mordenite

A technology of mordenite and synthesis method, which is applied in the direction of mercerized crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of complex synthesis process, difficulty in obtaining, high price, etc., and achieve simple synthesis process and low consumption , low-cost effect

Active Publication Date: 2011-09-21
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The technical problem to be solved by the present invention is that the preparation of mesoporous mordenite needs expensive or difficult-to-obtain materials as mesoporous templates in the prior art, and the synthesis process is complicated and the cost is high. A new mesoporous zeolite is provided synthesis method

Method used

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  • Method for synthesizing mesoporous mordenite
  • Method for synthesizing mesoporous mordenite
  • Method for synthesizing mesoporous mordenite

Examples

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Effect test

Embodiment 1

[0018] 213.7 grams of silica sol [containing 40% (weight) SiO 2 , the same below] is solution A, 81.0 grams of solid aluminum sulfate [chemically pure, Al 2 (SO 4 ) 3 18H 2 O, the same below] was dissolved in 140 milliliters of water to obtain B solution. 54.5 grams of solid sodium hydroxide (chemically pure) was dissolved in 300 milliliters of water to obtain solution C. Under stirring, solution A and solution B were added to solution C in parallel flow, and the two solutions were added simultaneously within 45 to 90 minutes. Add 85.48 grams of starch again, continue to stir for more than 1 hour, then add 8.3 grams of ammonia [chemically pure, containing 25.5% (weight) NH 3 ], and then stirred for 1 to 3 minutes. Then transfer the slurry into a crystallization tank with a stirring device, seal the crystallization tank, turn on the stirring device, and crystallize at a constant temperature of 190°C for 28 hours to obtain a crystallization product. The crystalline product...

Embodiment 2

[0021] 230.4 grams of silica sol is A solution, 56.3 grams of solid aluminum nitrate [chemically pure, Al(NO 3 ) 3 9H 2 O, the same below] was dissolved in 400 milliliters of water to obtain B solution. Dissolve 19.75 grams of tetraethylammonium bromide (TEABr) [chemically pure, the same below] in 700 milliliters of water under stirring, and then add 33 grams of solid sodium hydroxide to obtain solution C. Slowly add solution B and solution A to solution C in sequence, then add 165 grams of cellulose, and continue stirring for more than 1 hour. Then transfer the slurry into a crystallization kettle with a stirring device, seal the crystallization kettle, turn on the stirring device, and crystallize at a constant temperature of 120° C. for 9 days to obtain a crystallization product. The crystallized product was cooled, filtered and washed, dried at 100°C for 6 hours, and calcined at a constant temperature of 550°C for 4 hours to obtain a mesoporous mordenite product. Produc...

Embodiment 3

[0024] 230.8 grams of industrial water glass [containing 26% (weight) SiO 2 , 7.45% (weight) Na 2 O, the same below] is A solution, and 27.2 grams of solid aluminum sulfate is dissolved in 300 milliliters of water to obtain B solution. Get 118 grams of 25% (weight) tetraethylammonium hydroxide (TEAOH) solution, under agitation, A solution and B solution are simultaneously added in parallel, after the two solutions are added simultaneously, continue to stir for more than 15 minutes, add polyethylene glycol 30 g, continue stirring for more than 1 hour. Then transfer the slurry into a crystallization kettle with a stirring device, seal the crystallization kettle, turn on the stirring device, and crystallize at a constant temperature of 170° C. for 3 days to obtain a crystallization product. The crystalline product was cooled, filtered and washed, dried at 120°C for 4 hours, calcined at a constant temperature of 220°C for 2 hours, and then heated to 550°C for 2 hours to obtain a...

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Abstract

The invention relates to a method for synthesizing mesoporous mordenite, which mainly solves the problems that precious materials are needed to serve as mesoporous templates, the synthesis process is complicated and the cost is high in the prior art for preparing mesoporous zeolite. The method comprises the following steps of: mixing a silicon source, an aluminum source, an organic amine structure directing agent (SDA), a polymer mesoporous template agent R and water, wherein in the mixture, the molar ratio of SiO2 to Al2O3 is 8-500, the molar ratio of H2O to SiO2 is 5-100, the molar ratio ofSDA to SiO2 is 0-0.5, and the weight ratio of the polymer mesoporous template agent R to SiO2 is 0.05-3; and crystallizing the mixture at the temperature of between 100 and 200DEG C for 1 to 10 days to obtain a crystallization product, and washing, drying and roasting the crystallization product to obtain the mesoporous mordenite, wherein the polymer mesoporous template agent R is at least one ofstarch, dextrin, cellulose, polyethylene glycol, polyvinyl alcohol, polyether, polyvinyl formal and polyvinyl butyral. The technical scheme well solves the problems. The synthesized mesoporous mordenite has a micropore-mesopore composite structure; the synthesis process is simple; the mesoporous mordenite with the composite hole structure can be synthesized at low cost, better technical effect isachieved, and the method can be used for industrial production of the mesoporous mordenite.

Description

technical field [0001] The invention relates to a synthesis method of mesoporous zeolite. Background technique [0002] According to the pore size of molecular sieves, the International Union of Pure and Applied Chemistry defines them into three categories: those with a pore size less than 2nm are called microporous molecular sieves, those with a pore size between 2 and 50nm are called mesoporous or mesoporous molecular sieves, and those with a pore size larger than 50nm called macroporous molecular sieves. [0003] Mordenite is one of the earliest zeolites recognized by humans, and it is divided into two types: natural and synthetic. In 1948, Barrer et al. used sodium carbonate as a mineralizer to hydrothermally crystallize the mixed silicic acid gel and sodium aluminate aqueous solution at 265-295°C, and synthesized mordenite for the first time. Mordenite has excellent heat resistance, acid resistance and water vapor resistance, and is widely used in industry as an adsor...

Claims

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Application Information

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IPC IPC(8): C01B39/26
Inventor 祁晓岚陈雪梅孔德金
Owner CHINA PETROLEUM & CHEM CORP
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