Lamellar MWW molecular sieve as well as preparation method and application thereof

A technology of molecular sieves and sheets, applied in the field of molecular sieves, can solve the problems of low utilization rate of active sites, easy carbon deposition and deactivation, etc., and achieve the effect of improving the conversion rate of benzyl alcohol, increasing the external area, and reducing carbon deposition and deactivation

Pending Publication Date: 2020-06-12
GUANGDONG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of this, the present invention provides a sheet MWW molecular sieve and its preparation method and application, which are used to solve the problems of low active site utilization and easy carbon deposition and deactivation of sheet MWW molecular sieves

Method used

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  • Lamellar MWW molecular sieve as well as preparation method and application thereof
  • Lamellar MWW molecular sieve as well as preparation method and application thereof
  • Lamellar MWW molecular sieve as well as preparation method and application thereof

Examples

Experimental program
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Embodiment 1

[0048] This embodiment carries out the preparation of sheet MWW molecular sieve, comprises the following steps:

[0049] 1) Weigh 0.072g of sodium aluminate and 0.248g of sodium hydroxide and dissolve in 31.1g of deionized water, stir to dissolve, then add 1.91g of hexamethyleneimine and 2.36g of fumed silica, and stir magnetically at room temperature After 5 hours, it was transferred to a polytetrafluoroethylene bottle and crystallized for 11 days in a homogeneous reactor at 135° C. with a rotational speed of 8 rpm / min. After the crystallization was completed, the crystallized product was filtered, washed repeatedly with deionized water, and dried overnight in a drying oven at 100° C. to obtain the first product.

[0050]2) Weigh 9g of the aqueous solution containing 20wt% of the first product, mix it with 35.0g of 29wt% dodecyltrimethylammonium bromide aqueous solution and 11.0g of 40wt% tetrapropylammonium hydroxide aqueous solution, and react with magnetic stirring at room...

Embodiment 2

[0054] In this example, the preparation of sheet-layer MWW molecular sieves is carried out. The steps of this example are the same as in Example 1, except that the aqueous solution of dodecyltrimethylammonium bromide is replaced by aqueous solution of tetradecyltrimethylammonium bromide to obtain Sheet MWW molecular sieve PMWW-C14.

Embodiment 3

[0056] This embodiment carries out the preparation of sheet-layer MWW molecular sieve, and this embodiment is the same as embodiment 1 step, and the difference is that dodecyltrimethylammonium bromide aqueous solution is replaced by hexadecyltrimethylammonium bromide aqueous solution, obtains Sheet MWW molecular sieve PMWW-C16.

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Abstract

The invention belongs to the technical field of molecular sieves, and particularly relates to a lamellar MWW molecular sieve as well as a preparation method and application thereof. The invention discloses a preparation method of a lamellar MWW molecular sieve. Dodecyltrimethylammonium bromide, tetradecyltrimethylammonium bromide and / or hexadecyltrimethylammonium bromide are / is used as a swellingagent, by that the first product can be swelled and pillared; the MWW molecular sieve is modified into a two-dimensional layered structure, so that mesoporous channels are introduced between layers, the interlayer spacing of the obtained lamellar MWW molecular sieve is 2.5 to 4.7 nm; in addition, the outer surface area of the lamellar MWW molecular sieve is increased, the utilization rate of active sites is increased, and carbon deposit inactivation can be reduced. Experimental results show that the lamellar MWW molecular sieve prepared in the invention can significantly improve the conversionrate of benzyl alcohol and the selectivity of 2-benzyl-1,3,5-trimethylbenzene as an alkylation reaction catalyst.

Description

technical field [0001] The invention belongs to the technical field of molecular sieves, in particular to a sheet-layer MWW molecular sieve and its preparation method and application. Background technique [0002] At present, the sheet MWW molecular sieve has a three-dimensional structure and has three unique micropore structures. However, when the sheet MWW molecular sieve is used as a catalyst for macromolecular reactions, the reaction can only occur on the outer surface of the sheet MWW molecular sieve. Molecular sieves have the problems of low utilization of active sites and easy carbon deposition and deactivation. [0003] Therefore, how to improve the low utilization rate of the active sites of the sheet MWW molecular sieve and reduce the deactivation of carbon deposition has become an urgent problem to be solved by those skilled in the art. Contents of the invention [0004] In view of this, the present invention provides a sheet MWW molecular sieve and its prepara...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/48B01J29/70C07C15/16C07C2/86
CPCC01B39/48B01J29/7038C07C2/864C01P2002/20C01P2004/03C01P2004/20C07C15/16
Inventor 刘宝玉廖展图董晋湘方岩雄
Owner GUANGDONG UNIV OF TECH
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