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K-type CHA structure molecular sieve as well as preparation method and application thereof

A molecular sieve and K-type technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problems of long cycle time and high cost

Inactive Publication Date: 2021-08-31
潍坊正轩稀土催化材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the hydrothermal crystallization reaction cycle in the currently published molecular sieve synthesis method is long (4-7 days), and the cost of synthesizing SSZ-13 molecular sieve is relatively high.

Method used

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  • K-type CHA structure molecular sieve as well as preparation method and application thereof
  • K-type CHA structure molecular sieve as well as preparation method and application thereof
  • K-type CHA structure molecular sieve as well as preparation method and application thereof

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preparation example Construction

[0028] The present invention provides a kind of preparation method of molecular sieve of K type CHA structure, comprises the following steps:

[0029] mixing a potassium source, an aluminum source, a silicon source, an alkali source, a templating agent and water to obtain a sol-like slurry;

[0030] The sol-like slurry is sequentially crystallized and calcined to obtain a K-type molecular sieve with a CHA structure.

[0031] In the present invention, unless otherwise specified, the required preparation materials are commercially available products well known to those skilled in the art.

[0032] The invention mixes potassium source, aluminum source, silicon source, alkali source, template agent and water to obtain sol-like slurry. In the present invention, the potassium source preferably includes potassium metaaluminate, potassium hydroxide, potassium chloride, potassium sulfide, potassium chlorate or potassium carbonate, more preferably potassium metaaluminate or potassium h...

Embodiment 1

[0051] Under the condition of rotating speed of 300r / min, mix 200g of water and 30g of potassium metaaluminate evenly, add 50g of N,N,N-trimethyl-1-adamantyl ammonium hydroxide to the resulting mixture, and stir for 30min 72g of alkaline silica sol was added to the obtained material, and the stirring was continued for 2h to obtain a sol-like slurry;

[0052] Crystallize the sol-like material at 160°C for 30 hours, filter the obtained material, and wash it with deionized water. The mass ratio of the material to be washed to deionized water is 1:10, and dry the washed material at 120°C 4h, calcination at 550°C for 4h to obtain K-type molecular sieve with CHA structure.

Embodiment 2

[0054] Under the condition of rotating speed of 300r / min, mix 200g of water and 18g of potassium metaaluminate evenly, add 40g of N,N,N-trimethyl-1-adamantyl ammonium hydroxide to the resulting mixture, and stir for 30min 72g of alkaline silica sol was added to the obtained material, and the stirring was continued for 2h to obtain a sol-like slurry;

[0055] Crystallize the sol-like material at 160°C for 36h, filter the obtained material, wash with deionized water, the mass ratio of the material to be washed to deionized water is 1:10, dry at 120°C for 4h, and roast at 550°C 4h, to get K-type molecular sieve.

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Abstract

The invention provides a K-type CHA structure molecular sieve as well as a preparation method and application thereof, and belongs to the technical field of molecular sieve preparation. The preparation method of the K-type CHA structure molecular sieve comprises the following steps: mixing a potassium source, an aluminum source, a silicon source, an alkali source, a template agent and water to obtain sol-like slurry; and sequentially crystallizing and roasting the sol-like slurry to obtain the K-type CHA structure molecular sieve. By adding the potassium source, the synthesis period of the CHA molecular sieve can be shortened to 20-30 h, the prepared molecular sieve is in a regular square shape, and the particle size can be increased to 1-2 microns.

Description

technical field [0001] The invention relates to the technical field of molecular sieve preparation, in particular to a K-type molecular sieve with CHA structure and its preparation method and application. Background technique [0002] At present, there are various molecular sieves on the market, and the synthesis methods of molecular sieves are similar, and many molecular sieves can be successfully prepared as long as they are prepared under a specific template. SSZ-13 molecular sieve is a kind of microporous molecular sieve with chabazite (CHA) structure, its structure is made of AlO 4 and SiO 4 The tetrahedrons are connected end to end through oxygen atoms, and are arranged in an orderly manner with eight-membered ring channels and three-dimensional cross channel structures. Al(OH)Si bridging hydroxyl groups can be formed at the connected oxygen atoms, so that the skeleton has certain acidity and cations. Exchangeability; moreover, the pore size of SSZ-13 molecular sieve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J29/76
CPCB01J29/7623B01J2229/18C01B39/04C01P2002/72C01P2004/03C01P2004/61C01P2006/12
Inventor 邵明迪刘玉玲段成林阮征
Owner 潍坊正轩稀土催化材料有限公司