Preparation method forquickly synthesizing molecular sieve with hierarchical pore structure and product prepared by preparation method

A technology of graded pores and molecular sieves, applied in the direction of crystalline aluminosilicate zeolites, etc., to achieve the effects of improving solubility, excellent crystallinity, cost-effectiveness and large-scale manufacturability

Active Publication Date: 2021-09-10
JINGDEZHEN CERAMIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, so far, there has been no report on the direct synthesis of molecular sieves with hierarchical pore structures and high yields by short-time microwave heating

Method used

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  • Preparation method forquickly synthesizing molecular sieve with hierarchical pore structure and product prepared by preparation method
  • Preparation method forquickly synthesizing molecular sieve with hierarchical pore structure and product prepared by preparation method

Examples

Experimental program
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Embodiment 1

[0025] In this embodiment, a preparation method for rapidly synthesizing an LTA molecular sieve with a hierarchical pore structure, the steps are as follows:

[0026] (1) Preparation of precursor mixture

[0027] Weigh 58.9g of deionized water and pour it into a 150mL Erlenmeyer flask, add 30.4g of tetramethylammonium hydroxide aqueous solution (concentration is 25wt%), magnetically stir at room temperature for 5min; add 2.8g of sodium hydroxide aqueous solution (concentration is 1mol / L), stirred magnetically at room temperature for 10min; then added 5.3g aluminum isopropoxide (analytical pure), stirred magnetically at room temperature for 1h until dissolved; then slowly added 8.1g ethyl orthosilicate (analytical pure), at room temperature Under magnetic stirring for 30 minutes to form a precursor mixture;

[0028] (2) Preparation of precursor reaction solution

[0029] The above precursor mixture was stirred at room temperature for 12 hours for aging treatment to form a un...

Embodiment 2

[0033] In this embodiment, a preparation method for rapidly synthesizing an LTA molecular sieve with a hierarchical pore structure, the steps are as follows:

[0034] (1) Preparation of precursor mixture

[0035] Weigh 58.9g of deionized water and pour it into a 150mL Erlenmeyer flask, add 30.4g of tetramethylammonium hydroxide aqueous solution (concentration is 25wt%), magnetically stir at room temperature for 5min; add 2.8g of sodium hydroxide aqueous solution (concentration is 1mol / L), stirred magnetically at room temperature for 10min; then added 5.3g aluminum isopropoxide (analytical pure), stirred magnetically at room temperature for 1h until dissolved; then slowly added 8.1g ethyl orthosilicate (analytical pure), at room temperature Under magnetic stirring for 30 minutes to form a precursor mixture;

[0036] (2) Preparation of precursor reaction solution

[0037] The above precursor mixture was stirred at room temperature for 12 hours for aging treatment to form a un...

Embodiment 3

[0041] In this embodiment, a preparation method for rapidly synthesizing an LTA molecular sieve with a hierarchical pore structure, the steps are as follows:

[0042] (1) Preparation of precursor mixture

[0043] Weigh 58.9g of deionized water and pour it into a 150mL Erlenmeyer flask, add 30.4g of tetramethylammonium hydroxide aqueous solution (concentration is 25wt%), magnetically stir at room temperature for 5min; add 2.8g of sodium hydroxide aqueous solution (concentration is 1mol / L), stirred magnetically at room temperature for 10min; then added 5.3g aluminum isopropoxide (analytical pure), stirred magnetically at room temperature for 1h until dissolved; then slowly added 8.1g ethyl orthosilicate (analytical pure), at room temperature Under magnetic stirring for 30 minutes to form a precursor mixture;

[0044] (2) Preparation of precursor reaction solution

[0045] The above precursor mixture was stirred at room temperature for 12 hours for aging treatment to form a un...

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Abstract

The invention discloses a preparation method for quickly synthesizing a molecular sieve with a hierarchical pore structure, a silicon source and an aluminum source are used as raw materials, an organic structure directing agent and an alkaline pH regulator are combined, and different types of molecular sieves with good crystallinity and hierarchical pore structures are quickly prepared under a low-temperature condition by adopting a microwave heating process. In addition, the invention also discloses a product prepared by the preparation method for quickly synthesizing the molecular sieve with the hierarchical pore structure. The preparation method of the molecular sieve is expanded, the molecular sieve with excellent crystallization performance is developed, the preparation of different types of molecular sieves can be realized, and the molecular sieve has a hierarchical pore structure, is beneficial to mass transfer in the catalysis process, improves the catalytic selectivity, and effectively overcomes the problems that a traditional hydrothermal method is long in synthesis time, poor in product crystallization, single in pore structure and the like.

Description

technical field [0001] The invention relates to the technical field of molecular sieve preparation, in particular to a method for preparing a molecular sieve with a hierarchical pore structure and a product thereof. Background technique [0002] Molecular sieve stones have attracted much attention due to their unique properties, including ordered microporous networks and large active surfaces. Molecular sieves are microporous materials with specific pore structures. Due to the flexibility of chemical composition and pore structure as well as their good thermal stability, molecular sieves are widely used in the fields of catalysis, adsorption, separation and biomedicine. Currently, high demands on effectiveness, operability, stability, cost-effectiveness, and large-scale manufacturability motivate researchers to develop more efficient and simpler methods to rapidly synthesize high-quality molecular sieves to meet commercial demands. In addition, the single microporous struc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
CPCC01B39/04C01P2004/61C01P2004/62C01P2004/64C01P2006/16C01P2006/17
Inventor 曾小军夏国花
Owner JINGDEZHEN CERAMIC UNIV
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