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Preparation method of ZSM-22 molecular sieve nanosheet

A nanosheet and molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, can solve the problems of high cost and large amount of organic template agent, and achieve the effect of prolonging service life, improving catalytic activity and reducing cost

Active Publication Date: 2015-06-03
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] The present invention aims to solve the problems that the existing method for synthesizing ZSM-22 molecular sieve uses a large amount of organic template agent, the cost is high, and the molecular sieve grains exist in the form of larger aggregates, and provides a method that significantly reduces the amount of organic template agent, reduces the Cost, new method for synthesizing nanosheet ZSM-22 molecular sieves

Method used

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  • Preparation method of ZSM-22 molecular sieve nanosheet
  • Preparation method of ZSM-22 molecular sieve nanosheet
  • Preparation method of ZSM-22 molecular sieve nanosheet

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specific Embodiment approach 1

[0030] Specific embodiment one: The method for synthesizing ZSM-22 molecular sieve nanosheets by prefabricated seed crystal method in this embodiment is implemented according to the following steps:

[0031] 1. Preparation of prefabricated seed crystals:

[0032] a, take aluminum sulfate octadecahydrate, tetraethyl orthosilicate, 1,6 hexamethylenediamine, potassium hydroxide and deionized water as raw materials;

[0033] B, mixing the potassium hydroxide taken by step a with deionized water, dissolving to obtain an aqueous solution of potassium hydroxide, mixing the aluminum sulfate octadecanoate taken by step a with deionized water, and preparing an aqueous solution of aluminum sulfate after dissolving , mix the 1,6-hexamethylenediamine weighed in step a with deionized water, and dissolve to obtain an aqueous solution of 1,6-hexamethylenediamine, and mix the tetraethyl orthosilicate weighed in step a with deionized water to form a suspension liquid;

[0034] c. Add the alum...

specific Embodiment approach 2

[0047] Specific embodiment two: the difference between this embodiment and specific embodiment one is that the tetraethyl orthosilicate described in step a in step one is replaced by SiO 2 The calculated mass fraction is 28%. Other steps and parameters are the same as those in Embodiment 1.

specific Embodiment approach 3

[0048] Embodiment 3: The difference between this embodiment and Embodiment 2 is that the mass ratio of ethyl orthosilicate to deionized water described in step a in step 1 is 1: (3.1-5.0). Other steps and parameters are the same as in the second embodiment.

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Abstract

The invention discloses a preparation method of a ZSM-22 molecular sieve nanosheet, relates to a preparation method of a ZSM-22 molecular sieve, and aims at solving the problems that an organic template agent adopted by an existing method for synthesizing the ZSM-22 molecular sieve is large in amount and high in cost, and molecular sieve grains exist in a form of an aggregate with a relatively large dimension. The preparation method comprises the following steps: 1, preparing prefabricated seed crystal from aluminum sulfate octadecahydrate, ethyl orthosilicate, 1,6-hexamethylendiamine, potassium hydroxide and deionized water; 2, preparing gel from aluminum sulfate octadecahydrate, silica sol, potassium hydroxide and deionized water; and 3, crystallizing and roasting. The ZSM-22 molecular sieve prepared by the method is in a regularly arranged laminated nanometer structure; the sheet thickness is only about 20nm; the amount of the organic template agent is significantly reduced in the synthesis process; the crystallization time is shortened; and the cost is reduced.

Description

technical field [0001] The invention relates to a preparation method of ZSM-22 molecular sieve. Background technique [0002] ZSM-22 zeolite molecular sieve has one-dimensional linear non-intersecting straight channels with a channel size of 0.45nm×0.55nm, rich acid sites and strong acid strength. It is used as a solid acid catalyst for isomerization of alkenes and alkanes, alkanes Aromatization, hydrocracking and selective alkylation of alkylbenzenes. [0003] Johan A. et al. (Journal of Catalysis, 203(2001) 213-231) used n-decane to n-tetracosane as model compounds to evaluate the hydroisomerization performance of Pt / H-ZSM-22, and obtained excellent isomerization performance. Biscard et al. reported in US20040186006 that ZSM-22 molecular sieve was used as an acid carrier in the isomerization reaction of n-alkanes with carbon number greater than 10, which also showed good isomerization performance. Kumar et al. (Applied Catalysis A: General, 139 (1996) 189-199) reported ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
CPCC01B39/04C01P2002/72C01P2004/03C01P2004/24
Inventor 吴伟张建伟戚鑫魏小盟
Owner HEILONGJIANG UNIV
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