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Preparation method of high-silica-alumina-ratio Y-type molecular sieve

A high silicon-aluminum ratio, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc.

Active Publication Date: 2020-04-07
JILIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] Although the existing Y-type molecular sieve prepared by a one-step synthesis method has a certain improvement in the silicon-aluminum ratio, there is still a lot of room for improvement compared to industrial needs.

Method used

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  • Preparation method of high-silica-alumina-ratio Y-type molecular sieve
  • Preparation method of high-silica-alumina-ratio Y-type molecular sieve
  • Preparation method of high-silica-alumina-ratio Y-type molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] Take 6.495g of tetrabutylammonium hydroxide and 0.014g of tetramethylammonium hydroxide, add 31.542g of deionized water, mix well to obtain a dual template solution, wherein the mass percentage of tetrabutylammonium hydroxide is 17.07%, tetramethyl The mass percentage concentration of ammonium hydroxide is 0.037%. Add 0.425g of sodium metaaluminate and 0.776g of sodium hydroxide to the dual template agent solution for stirring and dissolving to obtain the first mixed solution. Add 7.510g of silica sol to the first mixed solution at a dropping rate of 1 drop / s ( Content 40.0wt.%), stir evenly, add 0.07g Tosoh Y molecular sieve (SiO 2 / Al 2 O 3 =115) As a seed crystal, a second mixed solution is obtained.

[0050] The second mixed solution was stirred at 25°C for 15h for aging treatment. After the aging treatment was completed, the aging treatment solution was transferred to the reactor, and the reactor was placed in an oven for static crystallization at 100°C for 8d. After...

Embodiment 2

[0052] Take 8.145g of tetrapropylammonium hydroxide and 0.685g of tetramethylammonium hydroxide, add 27.036g of deionized water, and mix evenly to obtain a dual template solution, wherein the mass percentage concentration of tetrapropylammonium hydroxide is 22.71% , The mass percentage concentration of tetramethylammonium hydroxide is 1.91%. Add 1.168 g of aluminum sulfate and 0.991 g of potassium hydroxide to the dual template agent solution for stirring and dissolving to obtain the first mixed solution. Add 3.004 g of fumed silica to the first mixed solution, stir well, and finally add 0.042 g of Tosoh Y molecular sieve (SiO 2 / Al 2 O 3 =115) As a seed crystal, a second mixed solution is obtained.

[0053] The second mixed solution was stirred for 8 hours at 25°C for aging treatment. After the aging treatment was completed, the aging treatment solution was transferred to the reactor, and the reactor was placed in an oven for static crystallization at 120°C for 10 days. After t...

Embodiment 3

[0055] Take 2.034 g of tetrapropyl ammonium hydroxide and 0.237 tetramethyl ammonium hydroxide, add 14.400 g of deionized water, mix well to obtain a dual template solution, wherein the mass percentage concentration of tetrapropyl ammonium hydroxide is 12.20%, The mass percentage concentration of tetramethylammonium hydroxide is 1.42%. 0.340g of sodium metaaluminate and 0.460g of sodium hydroxide were added to the dual template agent solution for stirring and dissolving to obtain the first mixed solution, and 3.000g of silica sol was added dropwise to the first mixed solution at a dropping rate of 1 drop / s ( Content 40.0wt.%), stir evenly, add 0.070g Tosoh Y molecular sieve (SiO 2 / Al 2 O 3 =115) As a seed crystal, a second mixed solution is obtained.

[0056] The second mixed solution was stirred at 25°C for 24h for aging treatment. After the aging treatment was completed, the aging treatment solution was transferred to the reactor, and the reactor was placed in an oven for stat...

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Abstract

The invention belongs to the technical field of molecular sieve synthesis and particularly relates to a preparation method of a Y-type molecular sieve with a high silica-alumina ratio. The preparationmethod comprises the following steps: dissolving two template agents, and mixing a double-template-agent solution with an aluminum source and an alkali source to obtain a first mixed solution; mixingthe first mixed solution with a silicon source and a seed crystal to obtain a second mixed solution; and finally, sequentially carrying out aging treatment and hydrothermal crystallization treatmenton the second mixed solution to obtain the Y-type molecular sieve with the high silica-alumina ratio. According to the invention, according to the method of taking the high-silica Y molecular sieve asa seed crystal and synthesizing the Y-type molecular sieve with the high silica-alumina ratio in a double-template system, the Y molecular sieve with the SiO2 / Al2O3 ratio of 6.00-21.352 is synthesized in one step. In addition, the Y-type molecular sieve obtained according to the preparation method is high in crystallinity, the preparation method adopts cheap raw materials, the synthesis method issimple and easy to operate, and the method is suitable for large-scale industrial production.

Description

Technical field [0001] The invention belongs to the technical field of molecular sieve synthesis, and specifically relates to a preparation method of a Y-type molecular sieve with a high silicon to aluminum ratio. Background technique [0002] Y molecular sieve is usually used as a catalyst and adsorption separation agent in the process of petroleum catalytic cracking. At present, Y molecular sieves with FAU configuration are widely used in petroleum conversion processes due to their large super cage structure and suitable pore size. The silicon-to-aluminum ratio of the Y-type molecular sieve has an important influence on the life of the catalyst, product distribution and catalytic performance. Y molecular sieve with high silicon to aluminum ratio has the advantages of high catalytic activity and good stability. [0003] The silicon-to-aluminum ratio of Y molecular sieve is generally 3~5, when the SiO of Y molecular sieve 2 / Al 2 O 3 When >6, it is called high-silicon Y molecu...

Claims

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Application Information

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IPC IPC(8): C01B39/24
CPCC01B39/24C01P2002/72C01P2002/86C01P2004/03
Inventor 闫文付朱卡克米珍睿王佳于吉红徐如人
Owner JILIN UNIV
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