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Aluminum phosphate molecular sieve with CHA structure and premolding synthesis method

A technology of aluminum phosphate molecular sieve and molecular sieve, which is applied in the direction of molecular sieve catalyst, molecular sieve characteristic aluminum phosphate, molecular sieve and alkali-exchanged phosphate, etc., can solve the problems of waste of raw materials, environment, pollution, etc., and achieves less usage, simple process and low production cost. Effect

Inactive Publication Date: 2018-06-12
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] The purpose of the present invention is to simplify the traditional technological process of catalyst preparation, solve the problems of raw material waste and environmental pollution in the catalyst preparation process, and provide a method for preforming and synthesizing aluminum phosphate molecular sieves with a CHA structure

Method used

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  • Aluminum phosphate molecular sieve with CHA structure and premolding synthesis method
  • Aluminum phosphate molecular sieve with CHA structure and premolding synthesis method
  • Aluminum phosphate molecular sieve with CHA structure and premolding synthesis method

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Experimental program
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Effect test

Embodiment 1

[0044] 17.35g pseudo-boehmite (78.6wt%Al 2 o 3 ) was placed in a 250ml beaker, added 95.39g deionized water, stirred at room temperature for 30 minutes, added 36.98g of phosphoric acid with a concentration of 85wt%, stirred at room temperature for 3 hours, added 6.01g of hydrofluoric acid with a concentration of 40wt%, and continued After stirring for 30 minutes, 7.68 g of N-methylimidazole (1-mim) was added, stirred until uniform and evaporated to dryness at 90° C. to obtain dry gum. The above dry glue is extruded into a cylindrical strip. Take 1g of molded dry glue and put it into a crystallization kettle with a polytetrafluoroethylene kettle lining, add 5g of 1-ethyl-3-methylimidazolium bromide ionic liquid into the crystallization kettle, and crystallize at 170°C for 8 sky.

[0045] After the crystallization, the crystallization kettle was cooled to room temperature, and the crystallized product was washed with deionized water and dried at 80° C. to obtain a shaped mole...

Embodiment 2

[0047] 17.35g pseudo-boehmite (78.6wt%Al 2 o 3 ) is placed in a 250ml beaker, add 129.23g deionized water, stir at room temperature for 30 minutes, add 66.35g of phosphoric acid with a concentration of 85wt% and 7.69g of ammonium dihydrogen phosphate with a purity of 99%, after stirring at room temperature for 3 hours, add 0.6g of hydrofluoric acid with a concentration of 40wt% was stirred for 30 minutes, then 32.92g of N-methylimidazole (1-mim) was added, stirred until uniform and evaporated to dryness at 110°C to obtain dry glue. Extrude the above dry glue into clover strips. Take 1g of molded dry glue and put it into a crystallization kettle with a polytetrafluoroethylene lining, add 10g of 1-ethyl-3-methylimidazolium bromide ionic liquid into the crystallization kettle, and crystallize at 230°C for 8 days .

[0048] After the crystallization, the crystallization kettle was cooled to room temperature, and the crystallized product was washed with deionized water and dried...

Embodiment 3

[0050] 17.35g pseudo-boehmite (78.6wt%Al 2 o 3 ) was placed in a 250ml beaker, added 44.23g deionized water, stirred at room temperature for 30 minutes, added 9.25g of phosphoric acid with a concentration of 85wt%, and stirred at room temperature for 3 hours, then added 18.04g of 40wt% hydrofluoric acid and 1.49 g of ammonium fluoride with a purity of 99%, and after stirring for 30 minutes, add 1.1 g of N-methylimidazole (1-mim), stir until uniform and evaporate to dryness at 70° C. to obtain dry gum. The above dry glue is extruded into a cylindrical strip. Take 1g of molded dry glue and put it into a crystallization kettle with a polytetrafluoroethylene kettle lining, add 5g of 1-ethyl-3-methylimidazolium bromide ionic liquid into the crystallization kettle, and crystallize at 230°C for 40 minute.

[0051] After the crystallization, the crystallization kettle was cooled to room temperature, and the crystallized product was washed with deionized water and dried at 80° C. to...

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Abstract

The invention discloses an aluminum phosphate molecular sieve with a CHA structure and a premolding synthesis method, and relates to the technical field of preparation of molecular sieves. The methodis mainly characterized in that an aluminum source, a phosphorus source, a fluorine source, organic amine and water are uniformly mixed to prepare a gel, the gel is dried, and molding is performed; and the molded dry gel is placed at the temperature of 80-300 DEG C, crystallization is performed for 10minutes to 10 days, and therefore the molded molecular sieve is obtained. According to the methodprovided by the invention, the CHA-type aluminum phosphate molecular sieve with a desired shape can be prepared in one step, and the preparation process of the catalyst is simplified. The molded aluminum phosphate molecular sieve with the CHA structure prepared by the method can be directly used as an adsorbent or as a catalyst carrier for use, and has the high molecular sieve content. The methodhas a simple process, a less use amount of a template agent, low production costs, no large amount of a waste liquid, environmental friendliness, and wide application prospects in the field of catalyst preparation.

Description

technical field [0001] The invention relates to the technical field of molecular sieve synthesis, in particular to an aluminum phosphate molecular sieve with a CHA structure and a preformed synthesis method Background technique [0002] Molecular sieves have adjustable skeleton composition, regular pore structure, excellent thermal stability and hydrothermal stability, and have a wide range of applications in the fields of catalysis, ion exchange and adsorption separation. Because the particle size of molecular sieve powder is too small, it is inconvenient in practical application, and there are disadvantages such as difficult recovery, easy deactivation and aggregation, so it is necessary to prepare powdered molecular sieve into a catalyst with a certain shape. Traditional catalyst molding generally includes the following steps: crystallization to obtain powdered molecular sieves, filtration and washing, drying and molding. The molding steps of the catalyst are cumbersome....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/06B01J29/84
CPCB01J29/84C01B37/06C01B39/54C01P2002/72
Inventor 田志坚王苹马怀军王从新王冬娥刘浩厉晓蕾
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI