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Y-Beta composite molecular sieve having double mesoporous structure, and preparation method thereof

A composite molecular sieve, double mesoporous technology, applied in the direction of crystalline aluminosilicate zeolite, fajhedral crystalline aluminosilicate zeolite, etc., can solve the problem of inability to handle aromatic macromolecules, achieve excellent catalytic activity, increase acid content, reduce The effect of silicon aluminum ratio

Active Publication Date: 2016-05-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pore size of the secondary pore structure is mainly concentrated in 3~5nm, and it is still unable to handle aromatic hydrocarbon macromolecules with two rings or more. Therefore, the preparation of molecular sieves with larger secondary pore structure is a very important scientific research direction.

Method used

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  • Y-Beta composite molecular sieve having double mesoporous structure, and preparation method thereof
  • Y-Beta composite molecular sieve having double mesoporous structure, and preparation method thereof
  • Y-Beta composite molecular sieve having double mesoporous structure, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Mix sodium hydroxide and water, and heat to 60°C in a water bath under stirring conditions, then add tetrapropylammonium hydroxide, and finally add Y-Beta composite molecular sieve, continue to stir at constant temperature for 2 hours, cool, and suction filter to The pH value is less than 9, dried at 110°C for 12 hours, and finally roasted at 550°C for 4 hours to remove residual organic matter. Finally, the Y-Beta composite molecular sieve after alkali treatment is subjected to ammonium exchange to obtain the double mesoporous Y-Beta composite molecular sieve. The concentration of the sodium hydroxide solution is 0.48mol / L, the concentration of tetrapropylammonium hydroxide in the sodium hydroxide solution is 0.12mol / L, and the mass ratio of water to molecular sieves is 8. The specific properties of the double mesoporous Y-Beta composite molecular sieve are shown in Table 1.

Embodiment 2

[0026] Mix sodium hydroxide and water, and heat to 75°C in a water bath under stirring conditions, then add tetrabutylammonium hydroxide, and finally add Y-Beta composite molecular sieves, continue to stir at constant temperature for 1.5 hours, cool, and suction filter to the pH value If it is less than 9, dry at 110°C for 24 hours, and finally bake at 500°C for 5 hours to remove residual organic matter. Finally, the alkali-treated Y-Beta composite molecular sieve is subjected to ammonium exchange to obtain a double mesoporous Y-Beta composite molecular sieve. The concentration of the sodium hydroxide solution is 0.49mol / L, the concentration of tetrabutylammonium hydroxide in the sodium hydroxide solution is 0.12mol / L, and the mass ratio of water to molecular sieve is 11. The specific properties of the double mesoporous Y-Beta composite molecular sieve are shown in Table 1.

Embodiment 3

[0028] Mix sodium hydroxide and water, and heat to 65°C in a water bath under stirring conditions, then add tetraethylammonium hydroxide, and finally add Y-Beta composite molecular sieves, continue to stir at constant temperature for 2 hours, cool, and suction filter to The pH value is less than 9, dried at 90°C for 18 hours, and finally roasted at 540°C for 6 hours to remove residual organic matter. Finally, the alkali-treated Y-Beta composite molecular sieve is subjected to ammonium exchange to obtain a double mesoporous Y-Beta composite molecular sieve. The concentration of the sodium hydroxide solution is 0.60 mol / L, the concentration of tetraethylammonium hydroxide in the sodium hydroxide solution is 0.11 mol / L, and the mass ratio of water to molecular sieves is 9. The specific properties of the double mesoporous Y-Beta composite molecular sieve are shown in Table 1.

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Abstract

The present invention discloses a Y-Beta composite molecular sieve having a double mesoporous structure, and a preparation method thereof. The Y-Beta composite molecular sieve has two mesoporous structures such as 3-5 nm mesopores and 7-10 nm mesopores, wherein the pore volume of the mesopores with the pore size of 3-5 nm accounts for 20-50% of the total pore volume, the pore volume of the mesopores with the pore size of 7-10 nm accounts for 15-40% of the total pore volume, a molar ratio of silica to alumina is 7-25, a specific surface area is 480-780 m<2> / g, the total pore volume is 0.39-0.70 ml / g, and the average pore size is 1.7-3.8 nm. The preparation method comprises: (1) dissolving an inorganic alkali and an organic alkali in water to form a mixed solution; and (2) adding a hydrogen type Y-Beta composite molecular sieve to the mixed solution, carrying out a constant temperature treatment, filtering, washing, drying, calcining, and carrying out ammonium exchange on the calcined product to obtain the Y-Beta composite molecular sieve having the double mesoporous structure. The Y-Beta composite molecular sieve of the present invention can provide more reaction spaces for macromolecules so as to improve the catalytic performance of the composite molecular sieve.

Description

technical field [0001] The invention relates to a Y-Beta composite molecular sieve with a double mesoporous structure and a preparation method thereof. Background technique [0002] Y-type molecular sieve is formed by octahedral molecular sieve cages interpenetrating with each other along three crystal axes through twelve-membered rings. It is an excellent catalyst active component with high cracking activity and good selectivity. The discovery of Y-type molecular sieve and The application has epoch-making significance in the field of catalysis. High silicon-aluminum ratio Y-type molecular sieve (the molar ratio of silicon oxide to aluminum oxide is above 4.3) is used as a catalytic material in catalytic cracking of petroleum processing after modification because of its good hydrothermal stability and acid stability. And played an irreplaceable role in the process of hydrocracking. [0003] For a long time, the modification of Y-type molecular sieves has been widely concer...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24
Inventor 秦波杜艳泽柳伟张晓萍王凤来
Owner CHINA PETROLEUM & CHEM CORP
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