Method for synthesizing ers-7 zeolite molecular sieve with linear polyquaternium organic template

A technology of ERS-7, zeolite molecular sieve, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of easy to have miscellaneous crystals, narrow zeolite phase region, complex template synthesis process, etc., to simplify synthesis, reduce difficulty, and improve The effect of catalytic activity

Active Publication Date: 2018-09-21
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Usually, the synthesis of ERS-7 requires the use of N,N-dimethylpiperidinium ammonium hydroxide as an organic template. In the process of zeolite preparation, not only the synthesis of the template is complicated (needs ion e

Method used

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  • Method for synthesizing ers-7 zeolite molecular sieve with linear polyquaternium organic template
  • Method for synthesizing ers-7 zeolite molecular sieve with linear polyquaternium organic template
  • Method for synthesizing ers-7 zeolite molecular sieve with linear polyquaternium organic template

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Experimental program
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Effect test

Embodiment 1

[0019] Embodiment 1: the synthesis of linear polyquaternium organic template

[0020] According to the molar ratio of 1,4-dibromobutane and N,N,N,N-tetramethyl-1,4-butanediamine is 1:1, weigh 10g 1,4-dibromobutane and 15g Dissolve N,N,N,N-tetramethyl-1,4-butanediamine in 50ml of ethanol, set the temperature at 80°C to reflux, stir for 12 hours, after the reaction is completed, add ether to the reaction product to produce A white solid precipitated, filtered and dried to obtain the required template.

Embodiment 2

[0021] Embodiment 2: Synthesis of ERS-7 zeolite by linear polyquaternium salt organic template

[0022] 8.12g H 2 O, 0.065g NaAlO 2 , 0.3g NaOH, 0.65g organic template (T, structure such as figure 1 ) and 3.32g of silica sol with a silicon dioxide content of 30% were placed in a beaker and stirred evenly, and then the gel was added to a polytetrafluoroethylene stainless steel reaction kettle, crystallized at 160°C for 5 days and then completely crystallized, and the product was filtered with suction. The product is obtained after drying. The proportioning of reaction raw material is as follows:

[0023] 35H 2 O:SiO 2 :0.017Al 2 o 3 :0.23Na 2 O:0.04T

[0024] Through X-ray diffraction analysis, its structure is ERS-7 zeolite molecular sieve belonging to ESV ( figure 1 ), and it can be seen from the scanning electron microscope that the particle size of the synthesized product is relatively uniform and the purity is high, such as figure 2 shown.

Embodiment 3

[0025] Example 3: High temperature synthesis of ERS-7 zeolite with linear polyquaternium organic template

[0026] 12.67g H 2 O, 0.028g Al 2 (SO 4 ) 3 18H 2 O, 0.13g NaOH, 0.65g organic template (T, structure such as figure 1 ) and 3.32g of silica sol with a silicon dioxide content of 30% were placed in a beaker and stirred evenly, and then the gel was added into a polytetrafluoroethylene stainless steel reaction kettle, crystallized at 200°C for 1 day to completely crystallize, and the product was suction filtered, The product is obtained after drying. The proportioning of reaction raw material is as follows:

[0027] 50H 2 O:SiO 2 :0.0025Al 2 o 3 :0.1Na 2 O:0.04T

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Abstract

The invention relates to a molecular sieve preparation method and aims to provide a method for compounding ERS-7 zeolite molecular sieves by line-type polyquaternium organic formworks. The method for compounding the ERS-7 zeolite molecular sieves by the line-type polyquaternium organic formworks comprises the following steps that water, a silicon source, an aluminum source, an alkali source and a formwork agent are mixed, stirred until evenness is achieved and stored in a reaction still, products of the crystallization reaction are subjected to extraction filtration and drying, and thus raw powder of the ERS-7 zeolite molecular sieves is obtained. According to the method for compounding the ERS-7 zeolite molecular sieves by the line-type polyquaternium organic formworks, compounding of organic formwork agents can be greatly simplified, and the compounding phase areas of the organic formwork agents can be broadened at a wide range, so that difficulty for compounding the products is greatly reduced, and a very good basis for application of the products is established. The products keep good crystallinity and purity, have good catalytic reaction activity and provide a novel thought for compounding zeolites.

Description

technical field [0001] The invention belongs to a molecular sieve preparation method, in particular to a method for synthesizing ERS-7 zeolite molecular sieve with a novel linear polyquaternary ammonium salt organic template. Background technique [0002] Molecular sieves are widely used in catalysis, ion exchange, adsorption and separation due to their open structure and large surface area. In the synthesis of modern zeolite molecular sieves, the use of organic templates has greatly promoted the development of synthetic chemistry of zeolite molecular sieves. Quaternary ammonium salts are a large class of templates for the synthesis of zeolite molecular sieves, and various zeolite structures have been synthesized, such as Beta, ZSM-5, ERS-7, etc. Among them, ERS-7 is a zeolite with a one-dimensional eight-membered ring structure, which was first reported by Millini et al. Generally, the synthesis of ERS-7 requires the use of N,N-dimethyl piperidinium ammonium hydroxide as ...

Claims

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Application Information

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IPC IPC(8): C01B39/04
CPCC01B39/04C01P2002/72C01P2004/03
Inventor 吴勤明孟祥举肖丰收
Owner ZHEJIANG UNIV
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