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Isomorphous composite molecular sieve and preparation method and application thereof

A composite molecular sieve and molecular sieve technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, crystalline aluminosilicate zeolites, etc., can solve the problems of poor hydrothermal stability, collapse of crystal channel topology, and failure to widely promote nanometer Y-type molecular sieves, etc. problems, to achieve the effect of enhanced hydrothermal stability and cracking activity

Active Publication Date: 2015-04-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At the same time, the synthesis of nano-Y-type molecular sieves has also attracted the attention of many researchers, but the synthesized nano-Y-type molecular sieves have poor hydrothermal stability. During the hydrothermal treatment, the crystal channel topology completely collapses.
Therefore, nano Y-type molecular sieves cannot be widely promoted in practical applications.

Method used

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  • Isomorphous composite molecular sieve and preparation method and application thereof

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Effect test

Embodiment 1

[0018] Prepare guides. Under the condition of stirring, water glass, sodium hydroxide, water and aluminum source were successively added into the beaker, after stirring evenly, it was put into a stainless steel synthesis kettle and aged at 50°C for 48 hours to obtain the directing agent. The molar ratio of each material in the mixture is n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 (O)=16:1:15.5:360.

[0019] Preparation of composite molecular sieves. Under the condition of stirring, add water glass, sodium hydroxide, aluminum source and water into the beaker in turn, and then add the required amount of Y-type molecular sieve (the molar ratio of silicon oxide to aluminum oxide is 5.2) into the solution, After stirring evenly, add a directing agent, stir for 1.5 hours, put the gel into a stainless steel reactor, and crystallize at a constant temperature of 100°C for 48 hours, cool, wash, suction filter, and dry to obtain a Y-Y composite molecular sieve. The mass of ...

Embodiment 2

[0021] Prepare guides. Under the condition of stirring, water glass, sodium hydroxide, water and aluminum source were successively added into the beaker, after stirring evenly, it was put into a stainless steel synthesis kettle and aged at 60°C for 18 hours to obtain the directing agent. The molar ratio of each material in the mixture is n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O) =15:1:17:380.

[0022]Preparation of composite molecular sieves. Under the condition of stirring, add water glass, sodium hydroxide, aluminum source and water into the beaker in turn, and then add the required amount of Y-type molecular sieve (the molar ratio of silicon oxide to aluminum oxide is 6.2) into the solution, After stirring evenly, add a directing agent, and after stirring for 1 hour, put the gel into a stainless steel reaction kettle for constant temperature crystallization at 110°C for 24 hours, cool, wash, suction filter, and dry to obtain a Y-Y composite molecular sieve....

Embodiment 3

[0024] Prepare guides. Under the condition of stirring, water glass, sodium hydroxide, water and aluminum source were successively added into the beaker, after stirring evenly, it was put into a stainless steel synthesis kettle and aged at 45°C for 56 hours to obtain the directing agent. The molar ratio of each material in the mixture is n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O) =17:1:16:420.

[0025] Preparation of composite molecular sieves. Under the condition of stirring, add water glass, sodium hydroxide, aluminum source and water into the beaker in sequence, and then add the required amount of Y-type molecular sieve (the molar ratio of silicon oxide to aluminum oxide is 4.8) into the solution, After stirring evenly, add a directing agent, and after stirring for 1 hour, put the gel into a stainless steel reactor and crystallize at a constant temperature of 100°C for 60 hours, cool, wash, suction filter, and dry to obtain a Y-Y composite molecular sieve. ...

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Abstract

The invention discloses a method for preparing composite molecular sieves. The method includes the following steps: (1) aging a mixture of sodium silicate, sodium hydroxide, water and aluminum source at a temperature of 25-100 DEG C for 1-72 hours to obtain a directing agent, wherein the molar ratio of each material in the mixture is as follows: n(Na2O):n(Al2O3):n(SiO2):n(H2O)=(12-20):1:(12-20):(320-450); (2) adding Y-type molecular sieves and the directing agent prepared in step (1) into the mixture of sodium silicate, sodium hydroxide, aluminum source and water, stirring to obtain gelatin and crystallizing the gelatin at a constant temperature of 90-120 DEG C for 12-72 hours, and then cooling, washing, extracting and filtering, and drying to obtain Y-Y composite molecular sieves, wherein the mass of the added Y-type molecular sieves accounts for 4-40% of the total mass of the gelatin system, and the mass of the added directing agent accounts for 2-20% of the total mass of the gelatin system. The hydrothermal stability of the nanoscale Y-type molecular sieves in the prepared composite molecular sieves is improved remarkably, and the prepared composite molecular sieves have more prominent hydrocracking performance.

Description

technical field [0001] The invention relates to an isomorphic composite molecular sieve and its preparation method and application, in particular to a Y-Y composite molecular sieve with FAU-FAU structure and its preparation method and application. Background technique [0002] At present, composite molecular sieves have attracted more and more researchers' attention. Various composite molecular sieves are constantly being synthesized. For example, the MCM-41 / ZSM-5 composite molecular sieve disclosed in CN1208718, the microporous molecular sieve (ZSM-5, β zeolite, mordenite, L-type zeolite, MCM-22, ZSM-35) disclosed in CN1597516 and the mesoporous molecular sieve (MCM- 41) Composite molecular sieve, ZSM-22 / ZSM-23 composite molecular sieve disclosed in CN1686800, ZSM-35 / MCM-22 composite molecular sieve disclosed in CN101003379, ZSM-5 / mordenite composite molecular sieve disclosed in CN101091920, ZSM-5 / MCM disclosed in CN101279288 SAPO-5 (or AlPO4-5) composite molecular sieve,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/24B01J32/00B01J29/16C10G47/20
CPCB01J29/166B01J32/00C01B39/24C01P2002/72C01P2006/12C01P2006/14C01P2006/16C10G47/20
Inventor 秦波宋喜军梁皓
Owner CHINA PETROLEUM & CHEM CORP
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