Modified y molecular sieve with regular meso-micropores and preparation method thereof

A molecular sieve and mesoporous technology, applied in the field of molecular sieves, can solve the problems of low activity, poor thermal and hydrothermal stability, and high energy consumption

Active Publication Date: 2020-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

CN1382632A discloses a super-stabilizing method of small-grain Y-type zeolite, which is obtained by contacting the dry gas of silicon tetrachloride with small-grain NaY zeolite and washing it. Stability is just relatively poor, and this inventive method adopts the mode of vapor phase dealumination of silicon to process molecular sieve simultaneously, and this makes the thermal and hydrothermal stability of product worse, and activity is low; Small, high energy consumption and other disadvantages

Method used

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  • Modified y molecular sieve with regular meso-micropores and preparation method thereof
  • Modified y molecular sieve with regular meso-micropores and preparation method thereof
  • Modified y molecular sieve with regular meso-micropores and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] 25.20g high-alkali sodium metaaluminate solution (provided by Sinopec Catalyst Changling Branch, Al 2 O 3 The content is 40.2g / L, Na 2 O content is 255g / L, specific gravity is 1.324) added to 32.78g water glass (provided by Sinopec Catalyst Changling Branch, SiO 2 The content is 260.6g / L, Na 2 The content of O is 81.6g / L, the specific gravity is 1.2655, and the modulus is 3.3), the molar composition is 15Na. 2 O:A1 2 O 3 :15SiO 2 The first mixture was dynamically stirred and aged at room temperature for 48 hours, and then allowed to stand for 5 hours at 60°C. Finally, 7.5g of deionized water was added under stirring to obtain a final molar composition of 15Na 2 O:A1 2 O 3 :15SiO 2 :320H 2 The second mixture of O is the directing agent.

[0073] Under the conditions of room temperature and high-speed stirring, follow the directing agent (prepared in the previous step), 84.13g water glass (same as above), 6.71g low-alkali sodium metaaluminate solution (provided by Sinopec Catal...

Embodiment 2

[0077] 25.20g high-alkali sodium metaaluminate solution (provided by Sinopec Catalyst Changling Branch, Al 2 O 3 The content is 40.2g / L, Na 2 O content is 255g / L, specific gravity is 1.324) added to 32.78g water glass (provided by Sinopec Catalyst Changling Branch, SiO 2 The content is 260.6g / L, Na 2 The content of O is 81.6g / L, the specific gravity is 1.2655, and the modulus is 3.3), the molar composition is 15Na. 2 O:A1 2 O 3 :15SiO 2 The first mixture was dynamically stirred and aged at 60°C for 5 hours, and then allowed to stand for 5 hours at 60°C. Finally, 7.5g of deionized water was added under stirring to obtain the final molar composition as 15Na 2 O:A1 2 O 3 :15SiO 2 :320H 2 The second mixture of O is the directing agent.

[0078] Under the conditions of room temperature and high-speed stirring, follow the directing agent (prepared in the previous step), 84.13g water glass (same as above), 6.71g low-alkali sodium metaaluminate solution (provided by Sinopec Catalyst Changl...

Embodiment 3

[0082] 82.27g of high-alkali sodium metaaluminate solution (provided by Sinopec Catalyst Changling Branch, Al 2 O 3 The content is 40.2g / L, Na 2 O content is 340g / L, specific gravity is 1.297) is added to 145.68g water glass (provided by Sinopec Catalyst Changling Branch, SiO 2 The content is 260.6g / L, Na 2 The O content is 81.6g / L, the specific gravity is 1.2655, and the modulus is 3.3), the molar composition obtained is 20Na 2 O:A1 2 O 3 :20SiO 2 The first mixture was dynamically stirred and aged at 30°C for 20 hours, and then allowed to stand for 15 hours at 40°C. Finally, 30g of deionized water was added under stirring to obtain a final molar composition of 20Na 2 O:A1 2 O 3 :20SiO 2 :380H 2 The second mixture of O is the directing agent.

[0083] Under the conditions of room temperature and high-speed stirring, follow the directing agent (prepared in the preceding steps), 54.63g water glass (same as above), 8.32 low-alkali sodium metaaluminate solution (provided by Sinopec Cata...

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Abstract

The present invention relates to a modified Y molecular sieve having regular mesopore-micropore, and a preparation method thereof, wherein the molar ratio of the skeleton SiO2 / Al2O3 of the modified Ymolecular sieve is 5.0-6.0, the specific surface area of the mircopore is 400-600 m<2> / g, the pore volume of the micropore is 0.25-0.35 cm<3> / g, the specific surface area of the mesopore is 30-200 m<2> / g, the pore volume of the mesopore is 0.07-0.85 cm<3> / g, the pore size of the mesopore is 2.0-6.0 nm, and based on the total weight of the modified Y molecular sieve, the sodium oxide content in themodified Y molecular sieve is not more than 0.1 wt%. According to the present invention, the mesopore is introduced while the micropore of the Y molecular sieve is retained, and the mesopore and themicropore have connectivity so as to easily achieve the macromolecule diffusion.

Description

Technical field [0001] The present disclosure relates to the field of molecular sieves, in particular to a modified Y molecular sieve with regular mesopores-micropores and a preparation method thereof. Background technique [0002] In the late 1950s, Milton and Breck successfully synthesized a Y-type molecular sieve. Because of the structure of Y-type molecular sieve, SiO 2 With Al 2 O 3 The ratio is greater than the X-type molecular sieve, so the thermal stability and hydrothermal stability are improved. In the early 1970s, Grace Company developed the directing agent method to synthesize NaY molecular sieves. The raw material used water glass instead of expensive silica sol. The process was simplified and the growth cycle was shortened. As a result, NaY molecular sieves were quickly and widely used in petrochemical industries, especially The field of petroleum cracking catalysis. So far, among hundreds of molecular sieves that have been developed, Y-type molecular sieves are t...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
CPCC01B39/24C01P2002/72C01P2004/03C01P2006/12C01P2006/14C01P2006/16
Inventor 付强慕旭宏李永祥张成喜胡合新舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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