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Method for synthesizing large-grain Beta molecular sieve by temperature programming method

A temperature-programmed, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, which can solve problems such as small particles

Pending Publication Date: 2020-10-30
JIANGSU TIANNUO NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the grain size of the above-mentioned Beta molecular sieves is basically between 50nm and 200nm, and the particles are relatively small, while those with a grain size greater than 400nm are rarely reported, and there are certain limitations.

Method used

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  • Method for synthesizing large-grain Beta molecular sieve by temperature programming method
  • Method for synthesizing large-grain Beta molecular sieve by temperature programming method
  • Method for synthesizing large-grain Beta molecular sieve by temperature programming method

Examples

Experimental program
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Effect test

Embodiment 1

[0034] Add 6.0g KOH to 50.2g distilled water, stir until clear solution, then add 4.0g NaAlO 2 , stirred until clarified, slowly added 100g of silica sol dropwise to the above mixed solution under magnetic stirring to form silicate gel A; weighed a certain amount of tetraethylammonium hydroxide and tetraethylammonium bromide, and added Tetraethylammonium ions and SiO in silicate gels 2 The mass ratio of the above-mentioned template agent is 0.25, and the above-mentioned template agent is dissolved in 30.8g of deionized water and stirred until it is completely dissolved to obtain a mixed solution B. Under stirring conditions, the solution B is slowly added to the A gel to make the mixture uniform, and finally the mixture is transferred to In a polytetrafluoroethylene-lined stainless steel crystallization kettle, the temperature was raised from room temperature to 130°C at a rate of 5°C / hour, and then crystallized at 130°C for 120 hours; the product was separated to obtain Beta ...

Embodiment 2

[0038] Add 6.5g KOH to 50.2g distilled water, stir until clear solution, then add 4.0g NaAlO 2 , stirred until clarified, slowly added 100g of silica sol dropwise to the above mixed solution under magnetic stirring to form silicate gel A; weighed a certain amount of tetraethylammonium hydroxide and tetraethylammonium bromide, and added Tetraethylammonium ions and SiO in silicate gels 2 The mass ratio of the template agent is 0.20. Dissolve the above-mentioned template agent in 30.8g of deionized water and stir until it is completely dissolved to obtain a mixed solution B. Slowly add solution B to A gel under stirring conditions to make the mixture uniform, and finally transfer the mixture into In a polytetrafluoroethylene-lined stainless steel crystallization kettle, the temperature was raised from room temperature to 130°C at a rate of 5°C / hour, and then crystallized at 130°C for 120 hours; the product was separated to obtain Beta molecular sieve solid and mother liquor, and ...

Embodiment 3

[0042] Add 7.6g KOH to 50.2g distilled water, stir until clear solution, then add 4.0g NaAlO 2 , stirred until clarified, slowly added 100g of silica sol dropwise to the above mixed solution under magnetic stirring to form silicate gel A; weighed a certain amount of tetraethylammonium hydroxide and tetraethylammonium bromide, and added Tetraethylammonium ions and SiO in silicate gels 2 The mass ratio of the above-mentioned template agent is 0.25, and the above-mentioned template agent is dissolved in 30.8g of deionized water and stirred until it is completely dissolved to obtain a mixed solution B. Under stirring conditions, the solution B is slowly added to the A gel to make the mixture uniform, and finally the mixture is transferred to In a polytetrafluoroethylene-lined stainless steel crystallization kettle, the temperature was raised from room temperature to 130°C at a rate of 5°C / hour, and then crystallized at 130°C for 120 hours; the product was separated to obtain Beta ...

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Abstract

The invention discloses a method for synthesizing a large-grain Beta molecular sieve by a temperature programming method. On one hand, the synthesis time for synthesizing the large-grain Beta molecular sieve can be effectively shortened, due to the adoption of a temperature programming method, the crystallization process of the molecular sieve is accelerated and the crystallization period is shortened while the nucleation activation energy of the molecular sieve is reduced, the nucleation rate is increased and the particle size of a sample is reduced, and the crystallinity of the synthesized molecular sieve is relatively high, and on the other hand, the grain size of the synthesized large-grain Beta molecular sieve exceeds 400nm, the market blank is filled, and the way for further application of the Beta molecular sieve is broadened.

Description

technical field [0001] The invention relates to the technical field of molecular sieve synthesis methods, in particular to a method for synthesizing large-grain Beta molecular sieves by temperature programming. Background technique [0002] In 1967, Mobil disclosed in USP3308069 that it first synthesized Beta molecular sieves in silica-alumina gel containing sodium ions using tetraethylammonium hydroxide as a template agent, which has a unique three-dimensional staggered macroporous structure. Compared with Y-type molecular sieves, the amount ratio of silicon-aluminum substances of Beta molecular sieves can be adjusted in the range of tens to hundreds. Beta molecular sieves have good structural selectivity, acid catalytic properties and hydrothermal stability, and it is The excellent performance in adsorption and catalysis has been widely used in various petrochemical processes such as VOCs adsorption, hydrocracking, alkyl transfer reaction, esterification, isomerization, an...

Claims

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Application Information

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IPC IPC(8): C01B39/04
CPCC01B39/04C01P2002/72
Inventor 孙先勇张伟柴志波赵琦
Owner JIANGSU TIANNUO NEW MATERIAL TECH
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