Preparation method of Sn-beta molecular sieve nanocrystal

A nanocrystal and molecular sieve technology, applied in molecular sieves and alkali exchange compounds, nanotechnology, nanotechnology and other directions, can solve the problems of complex preparation and synthesis process, difficult to scale production, difficult waste water treatment, etc. Industrial production, low cost effect

Active Publication Date: 2019-11-08
NORTHEASTERN UNIV
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  • Abstract
  • Description
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Problems solved by technology

[0003] Nano-molecular sieves are generally prepared by conventional hydrothermal crystallization synthesis. Compared with conventional micron zeolites, the preparation and synthesis process is complicated, requiring the introduction

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  • Preparation method of Sn-beta molecular sieve nanocrystal
  • Preparation method of Sn-beta molecular sieve nanocrystal
  • Preparation method of Sn-beta molecular sieve nanocrystal

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preparation example Construction

[0026] A preparation method for Sn-beta molecular sieve nanocrystals, comprising the steps of:

[0027] (1) Mix 0.006~0.042g of tin tetrachloride and 4.21-20g of tetraethylammonium hydroxide with a mass fraction of 35% solution, stir at a stirring speed of 450~550r / min for 1~24h, and then Dry at 40-90°C for 120-720 minutes to prepare a mixed solution;

[0028] (2) After mixing the mixed solution with 1 to 5 g of white carbon black evenly, the mixture is prepared;

[0029] (3) Move the mixture into an open glass vessel, then transfer it to the lining of the hydrothermal reaction kettle, add 2-10ml deionized water to the lining of the hydrothermal reaction kettle, and prevent the water outside the glass vessel from entering the In a glass vessel; under steam-assisted conditions, after adjusting the hydrothermal reaction kettle to 100-200 ° C, the mixture is crystallized, and the crystallization time is 6-72 hours to obtain a crystalline product;

[0030] (4) Naturally cool the...

Embodiment 1

[0033] A preparation method for Sn-beta molecular sieve nanocrystals, comprising the steps of:

[0034] (1) Mix 0.021g of tin tetrachloride and 4.21g of tetraethylammonium hydroxide with a mass fraction of 35% solution, stir for 12h at a stirring speed of 500r / min, and then dry at 70°C for 120min to obtain mixture;

[0035] (2) After the white carbon black of mixing solution and 4.8g is mixed uniformly, make mixture;

[0036] (3) Move the mixture into an open glass vessel, then transfer it to the lining of the hydrothermal reaction kettle, add 2ml of deionized water to the lining of the hydrothermal reaction kettle, and prevent the water outside the glass vessel from entering the glass vessel Middle; under steam-assisted conditions, after adjusting the hydrothermal reactor to 160 ° C, the mixture was crystallized, and the crystallization time was 20 hours, and the crystallized product was obtained;

[0037] (4) Naturally cool the crystalline product to room temperature, then...

Embodiment 2

[0040] A preparation method for Sn-beta molecular sieve nanocrystals, comprising the steps of:

[0041] (1) Mix 0.042g of tin tetrachloride and 8.42g of tetraethylammonium hydroxide with a mass fraction of 35% solution, stir for 1h at a stirring speed of 450r / min, and then dry at 65°C for 180min to obtain mixture;

[0042] (2) After mixing the mixed solution with 5g of white carbon black, the mixture is prepared;

[0043] (3) Move the mixture into an open glass vessel, then transfer it to the lining of the hydrothermal reaction kettle, add 5ml of deionized water to the lining of the hydrothermal reaction kettle, and prevent the water outside the glass vessel from entering the glass vessel Middle; under steam-assisted conditions, after adjusting the hydrothermal reactor to 165 ° C, the mixture was crystallized, and the crystallization time was 26 hours, and the crystallized product was obtained;

[0044] (4) Naturally cool the crystalline product to room temperature, then was...

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Abstract

The invention discloses a preparation method of a Sn-beta molecular sieve nanocrystal. The preparation method comprises the following steps: mixing 0.006g-0.042g of tin tetrachloride with a solution of 4.21g-20g of tetraethylammonium hydroxide with a mass fraction of 35%, and conducting drying at 40-90 DEG C for 30-720 minutes, so as to obtain a mixed solution; uniformly mixing the mixed solutionwith 1g-5g of white carbon black, so as to obtain a mixture; carrying out crystallization on the mixture under a steam-assisted condition, so as to obtain a crystallization product; and sequentially cooling, washing, drying and calcining the crystallization product, so as to obtain the high-crystallinity Sn-beta molecular sieve nanocrystal. The synthetic steps of the preparation method are simple,seed crystals are not used, F ions are not introduced, the complete crystallization can be realized in a short time, the prepared Sn-beta molecular sieve nanocrystal is good in dispersity and uniformin particle size distribution, and meanwhile, the use amounts of a template agent and water used in the synthetic process are low, so that the method further has the advantages of being low in cost and environmental pollution, beneficial to industrial production and the like.

Description

technical field [0001] The invention belongs to the technical field of molecular sieve nanocrystals, and in particular relates to a preparation method of Sn-beta molecular sieve nanocrystals. Background technique [0002] Traditional zeolites have the advantages of uniform micropores, rich surface acid points, large specific surface area, good hydrothermal stability, etc., and are widely used in adsorption, heterogeneous catalysis, and molecular separation. However, since the pore size of zeolites is usually smaller than 0.7 nm, their diffusion limitation in crystals is a very serious problem when it comes to catalysts for macromolecular reactions. Nano molecular sieves can be prepared to shorten the diffusion path length to solve this problem. At present, nano molecular sieves have been widely used in traditional fields such as adsorbents, heterogeneous catalysis, and molecular separation, and their applications have been extended to emerging emerging fields such as microb...

Claims

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Application Information

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IPC IPC(8): C01B39/08C01B39/48B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B39/08C01B39/48C01P2002/72C01P2004/03C01P2004/64
Inventor 王卓鹏付佳辉
Owner NORTHEASTERN UNIV
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