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Method for preparing nano sillicalite-1 type total-silicalite molecular sieve

A kind of all-silicon molecular sieve, nanotechnology, applied in nanotechnology, nanotechnology, nanotechnology for materials and surface science, etc., can solve the problem of low yield of nano-silicalite-1 type all-silicon molecular sieve, achieve good performance, Effect of reduced diffusion resistance and high diffusion efficiency

Inactive Publication Date: 2012-11-14
HEILONGJIANG HEIKE TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention is to solve the technical problem of low yield of nano-silicalite-1 type all-silicon molecular sieve prepared by the existing method, thereby providing a preparation method of nano-silicalite-1 type all-silicon molecular sieve

Method used

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  • Method for preparing nano sillicalite-1 type total-silicalite molecular sieve

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specific Embodiment approach 1

[0012] Specific embodiment one: the preparation method of a kind of nano silicalite-1 type all-silicon molecular sieve in this embodiment is carried out according to the following steps:

[0013] One, take template agent, alkali source, silicon source and water, wherein the molar ratio of template agent, alkali source, silicon source and water is (1~4): (10~20): (80~100): (1000 ~2000), under the condition of 0℃~25℃, add template agent and alkali source into water in turn to obtain a mixed solution, then add silicon source to the mixed solution, and stir in a magnetic stirrer for 0.5~2h to obtain the mixture solidified glue system;

[0014] 2. Put the mixture gel system in an autoclave, and crystallize at a temperature of 90°C to 200°C for 24h to 48h. The crystallized product is washed, centrifuged, and dried in a vacuum oven, and then placed in a muffle furnace Calcined at 450°C for 4h-6h to prepare nano-silicalite-1 all-silicon molecular sieve.

[0015] The preparation meth...

specific Embodiment approach 2

[0018] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the template in step 1 is tetrapropylamine hydroxide, n-butylamine or triethylamine. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0019] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the templating agent in step 1 is n-butylamine. Others are the same as those in the first or second embodiment.

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Abstract

The invention relates to a method for preparing a nano sillicalite-1 type total-silicalite molecular sieve, belonging to the method for preparing the molecular sieve, and aiming to solve the technical problem that the nano-silicalite-1 type total-silicalite molecular sieve prepared by adopting the existing method has low yield. The method comprises the following steps: preparing the mixed solution of a templating agent and an alkali source, adding a silicon source into the mixed solution, stirring in a sealing form to obtain a mixture gel system, crystallizing the mixture gel system, washing the production of crystallization, centrifuging, drying, putting in a muffle furnace, and calcinating to obtain the nano sillicalite-1 type total-silicalite molecular sieve. The nano sillicalite-1 type total-silicalite molecular sieve prepared by adopting the method has the grain size of less than 20nm and the yield of 42-50%, can be used as the inert carrier of the shape selectivity catalyst and the gas separation membrane material and can be also in the field of gas separation and purification.

Description

technical field [0001] The invention relates to a method for preparing molecular sieves. Background technique [0002] Nano silicalite-1 zeolite is a molecular sieve with MFI framework structure, which can be used as an inert carrier for shape-selective catalysts and a gas separation membrane material. All silicon silicalite-1 type molecular sieve has extremely strong hygroscopicity and can be used for the separation and purification of gases. [0003] In 1978, Qin Guanlin and others used ethylamine, n-butylamine or tripropylamine as templates, and synthesized nano-MFI zeolite molecular sieves with a grain size of about 50nm under the conditions of low-temperature crystallization, stirring and adding salt, but H 2 O / SiO 2 =3500 is relatively high, so the yield of synthetic zeolite molecular sieve is low. In 2004, J.Aguado et al. used tetrac-grade ammonium hydroxide as the template agent, tetraethyl orthosilicate as the silicon source, and synthesized MFI zeolite molecular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/08B82Y30/00
Inventor 任滨侨赵路阳金玉张玉婷
Owner HEILONGJIANG HEIKE TECH CO LTD
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