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Synthesis method of beta/Y composite molecular sieve

A technology of composite molecular sieve and beta molecular sieve, which is applied in the field of molecular sieve catalytic material synthesis, and can solve the problem that the composite degree of the composite molecular sieve is difficult to control, etc.

Active Publication Date: 2013-04-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The degree of compounding of the compound molecular sieve obtained by this method is not easy to control, and a large number of β and Y type molecular sieves exist independently and are not compounded together.

Method used

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  • Synthesis method of beta/Y composite molecular sieve
  • Synthesis method of beta/Y composite molecular sieve
  • Synthesis method of beta/Y composite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Add 11.3g of sodium hydroxide, 65mL of distilled water, 5.8mL of sodium aluminate, and 33mL of water glass into a beaker, shake vigorously, and age at 30°C for 24h to obtain the Y structure-directing agent.

[0029] (2) Mix 2mL of the Y structure-directing agent obtained in step (1) with 1g of β molecular sieve, and let stand at 25°C for 8h.

[0030] (3) Dissolve 0.5 mL of sodium aluminate and 0.7 g of sodium hydroxide in 50 mL of distilled water, add 0.2 g of white carbon black after the dissolution is complete, and stir vigorously for 25 min; then add the Y structure-directing agent obtained in step (2) and The β molecular sieve mixture was vigorously stirred for 30 minutes; then it was placed in a closed reaction kettle and crystallized in an oven at 90°C for 24 hours. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120° C. for 12 hours, and the obtained sample was the β / Y composite molecular sieve.

[0031] From the XRD ...

Embodiment 2

[0033] (1) Add 12.5g of sodium hydroxide, 60mL of distilled water, 5.8mL of sodium aluminate, and 31mL of water glass into a beaker, shake vigorously, and age at 35°C for 15h to obtain the Y structure-directing agent.

[0034] (2) Mix 2.5mL of the Y structure-directing agent obtained in step (1) with 1g of β molecular sieve, and let it stand at 25°C for 10h.

[0035] (3) Dissolve 0.4 mL of sodium aluminate and 0.8 g of sodium hydroxide in 60 mL of distilled water, add 0.4 mL of water glass after the dissolution is complete, and stir vigorously for 30 min; then add the Y structure-directing agent obtained in step (2) and β The molecular sieve mixture was vigorously stirred for 30 minutes; then it was placed in a closed reaction kettle and crystallized in an oven at 95°C for 20 hours. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120° C. for 12 hours, and the obtained sample was the β / Y composite molecular sieve.

Embodiment 3

[0037] (1) Add 13g of sodium hydroxide, 70mL of distilled water, 4.5mL of sodium aluminate, and 30mL of water glass into a beaker, shake vigorously, and age at 30°C for 24h to obtain the Y structure-directing agent.

[0038] (2) Mix 3mL of the Y structure-directing agent obtained in step (1) with 1.5g of β molecular sieve, and let stand at 25°C for 7h.

[0039] (3) Dissolve 0.5 mL of sodium aluminate and 0.9 g of sodium hydroxide in 50 mL of distilled water, add 0.6 g of silica sol after the dissolution is complete, and stir vigorously for 30 min; then add the Y structure-directing agent obtained in step (2) and β The molecular sieve mixture was vigorously stirred for 30 minutes; then it was placed in a closed reaction kettle and crystallized in an oven at 85°C for 29 hours. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120° C. for 12 hours, and the obtained sample was the β / Y composite molecular sieve.

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Abstract

The invention discloses a synthesis method of a beta / Y composite molecular sieve, which comprises the following steps: mixing a beta molecular sieve and a Y-structure guide agent, standing for some time, mixing with a silica-alumina gel, and carrying out crystallization reaction. By using such treatment, the Y-structure guide agent can be firmly anchored on the surface of the beta molecular sieve to form crystal nucleus for growing the Y-type molecular sieve, thereby being beneficial to growing the Y-type molecular sieve on the surface of the beta molecular sieve, preventing the Y-type molecular sieve from forming an independent Y-type molecular sieve in the reaction solution system, and finally forming the highly-composite beta / Y composite molecular sieve with core-shell structure.

Description

technical field [0001] The invention relates to a method for synthesizing a composite molecular sieve. Specifically, it is a green method for synthesizing β / Y composite molecular sieves, which belongs to the field of synthesis of molecular sieve catalytic materials. Background technique [0002] β molecular sieve is currently the only macroporous high-silicon molecular sieve with intersecting twelve-membered ring channel system. Its skeleton structure is a symbiosis of tetragonal and monoclinic crystal systems, and three-dimensional twelve-membered ring channels are interlaced. β molecular sieves are widely used in many important reactions such as low-pressure hydrogenation, dewaxing, cracking, and isomerization of olefins or aromatics in the petrochemical industry. Y-type molecular sieves are one of the main varieties used as catalysts and adsorption separation agents. The catalysts made of Y-type molecular sieves are widely used in petroleum catalytic cracking and hydrocr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04C01B39/24
Inventor 范峰凌凤香王少军张会成陈晓刚杨春雁
Owner CHINA PETROLEUM & CHEM CORP
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