USY molecular sieve with double meso-structures and preparation method thereof

A molecular sieve and double-mesoporous technology, applied in the direction of crystalline aluminosilicate zeolite, octahedral crystalline aluminosilicate zeolite, etc., to achieve the effect of increasing acid content, strong anti-coking ability, good catalytic activity and diffusion performance

Active Publication Date: 2016-06-29
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 prepared secondary pore structure is mainly concentrated in 3~5nm, and it is still powerless for the conversion of some aromatic hydrocarbon macromolecules with two rings and above. Therefore, the preparation of molecular sieves with larger secondary pore structure is a very important research direction.

Method used

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  • USY molecular sieve with double meso-structures and preparation method thereof
  • USY molecular sieve with double meso-structures and preparation method thereof
  • USY molecular sieve with double meso-structures and preparation method thereof

Examples

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Effect test

Embodiment 1

[0022] Mix sodium hydroxide and water, and heat to 60°C in a water bath while stirring, then add tetrapropylammonium hydroxide, and finally add USY molecular sieves, continue stirring at constant temperature for 2 hours, cool, and filter with suction to the pH value If it is less than 9, dry at 120°C for 12 hours, and finally roast to remove residual organic matter. Finally, the alkali-treated USY molecular sieve is subjected to ammonium exchange to obtain a double mesoporous USY 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 USY molecular sieve are shown in Table 1.

Embodiment 2

[0024] Mix sodium hydroxide and water, and heat to 80°C in a water bath while stirring, then add tetrabutylammonium hydroxide, and finally add USY molecular sieve, continue stirring at constant temperature for 0.8 hours, cool, and filter with suction until the pH value is less than 9 , dried at 100°C for 24 hours, and finally roasted to remove residual organic matter. Finally, the alkali-treated USY molecular sieve is subjected to ammonium exchange to obtain a double mesoporous USY molecular sieve. The concentration of the sodium hydroxide solution is 0.50 mol / L, the concentration of tetrabutylammonium hydroxide in the sodium hydroxide solution is 0.11 mol / L, and the mass ratio of water to molecular sieves is between 11. The specific properties of the double mesoporous USY molecular sieve are shown in Table 1.

Embodiment 3

[0026] Mix sodium hydroxide and water, and heat to 55°C in a water bath while stirring, then add tetraethylammonium hydroxide, and finally add USY molecular sieves, continue stirring at constant temperature for 3 hours, cool, and filter with suction to the pH value If it is less than 9, dry at 90°C for 18 hours, and finally roast to remove residual organic matter. Finally, the alkali-treated USY molecular sieve is subjected to ammonium exchange to obtain a double mesoporous USY molecular sieve. The concentration of the sodium hydroxide solution is 0.60mol / L, the concentration of tetraethylammonium hydroxide in the sodium hydroxide solution is 0.11mol / L, and the mass ratio of water to molecular sieves is between 9. The specific properties of the double mesoporous USY molecular sieve are shown in Table 1.

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Abstract

The invention discloses a USY molecular sieve with double meso-structures. The volume of pores with pore sizes of 3 to 5 nm in the USY molecular sieve accounts for 15 to 40% of the total pore volume of the USY molecular sieve; the volume of pores with pore sizes of 7 to 10 nm accounts for 25 to 50% of the total pore volume of the USY molecular sieve; a mol ratio of silicon oxide to alumina in the molecular sieve is in a range of 7 to 15; and the USY molecular sieve has a specific surface area of 680 to 980 m<2>/g, a pore volume of 0.42 to 0.75 ml/g and an average pore size of 1.9 to 3.1 nm. The USY molecular sieve prepared in the invention has meso pores of two pore sizes, can provide more reaction space for large molecules and has improved catalysis performance.

Description

technical field [0001] The invention relates to a USY 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 axis directions through twelve-membered rings. It is an excellent catalyst active component, not only has high cracking activity, but also has good selectivity. Therefore, the discovery and use of Y-type molecular sieve has epoch-making significance in the field of catalysis. [0003] Since Y-type molecular sieves with a low silicon-aluminum ratio (the molar ratio of silicon oxide to aluminum oxide is between 3 and 4.2) do not have good hydrothermal stability, they have not been widely studied and widely used in the actual synthesis process and application. attention. The high silicon-aluminum ratio Y-type molecular sieve (the molar ratio of silicon oxide to aluminum oxide is above 4.3) ...

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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