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A kind of usy-y composite molecular sieve and preparation method thereof

A composite molecular sieve and molecular sieve technology, applied in the direction of molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of unmaintainable structure and different properties of core and shell

Active Publication Date: 2017-10-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual preparation process, because the structure of USY molecular sieves undergoes long-term crystallization at high temperature and high alkalinity during the synthesis of USY-Y composite molecular sieves, its structure cannot be maintained.
Therefore, no researchers have prepared USY-Y composite molecular sieves with different core-shell properties.

Method used

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  • A kind of usy-y composite molecular sieve and preparation method thereof
  • A kind of usy-y composite molecular sieve and preparation method thereof
  • A kind of usy-y composite molecular sieve and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) The USY molecular sieve was exchanged with tetraethylammonium bromide to stabilize the pore structure of the USY molecular sieve. The specific exchange process is as follows: add tetraethylammonium bromide into water, then add USY into molecular sieves, stir continuously for 1.5 hours, then suction filter and dry. The concentration of ammonium solution is 0.3mol / L, and the mass ratio of solution to molecular sieve is 8:1.

[0024] (2) According to the molar ratio n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=16:1:18:360, under stirring, add sodium aluminate, water, sodium hydroxide and water glass to the beaker in turn to form a mixed solution, and then age at 25°C for 2 days to obtain the directing agent .

[0025] (3) According to the molar ratio of each material in the gel (excluding the added USY molecular sieve) is n (NaOH):

[0026] n (Al 2 o 3 ): n (SiO 2 ): n (H 2O)=15:1:16:450 condition. Under the condition of stirring, add sodium alu...

Embodiment 2

[0028] (1) The USY molecular sieve was exchanged with cetyltrimethylammonium bromide to stabilize the molecular sieve structure. Add cetyltrimethylammonium bromide to water, then add USY into molecular sieves, stir continuously for 1.5 hours, filter with suction and dry. The concentration of ammonium solution is 0.2mol / L, and the mass ratio of solution to molecular sieve is 12:1.

[0029] (2) According to the molar ratio n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=18:1:19:360, under stirring, add sodium aluminate, water, sodium hydroxide and water glass to the beaker in turn to form a mixed solution, and then age at 35°C for 1 day to prepare the directing agent .

[0030] (3) According to the molar ratio of each material in the gel (excluding the added USY molecular sieve) is n (NaOH):

[0031] n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=15.5:1:14:550 condition. Under the condition of stirring, add aluminum sulfate, sodium hydroxide, water and water glass int...

Embodiment 3

[0033] (1) The USY molecular sieve was exchanged with tetrapropylammonium bromide to stabilize the molecular sieve structure. Add tetrapropylammonium bromide to water, then add USY into molecular sieves, stir continuously for 1 hour, filter with suction and dry. The concentration of ammonium solution is 0.35mol / L, and the mass ratio of solution to molecular sieve is 10:1.

[0034] (2) According to the molar ratio n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=16:1:16:340, in the state of stirring, sodium aluminate, water, sodium hydroxide and water glass were added to the beaker in turn to form a mixed solution, and then aged at 40°C for 1.5 days to obtain the directing agent .

[0035] (3) According to the molar ratio of each material in the gel (excluding the added USY molecular sieve) is n (NaOH):

[0036] n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=16:1:16:480 condition. Under the condition of stirring, add sodium aluminate, sodium hydroxide, water and water...

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Abstract

The invention discloses a USY-Y composite molecular sieve. The composite molecular sieve uses the USY-type molecular sieve as the core and the Y-type sub-sieve as the shell. The weight content of the Y-type molecular sieve in the composite molecular sieve is 10wt%~90wt%. ‑Microporous structure, the pore volume occupied by mesopores accounts for 15%~50% of the total pore volume of the molecular sieve, the molar ratio of silica / alumina in the composite molecular sieve is 4.2~25, the specific surface area is 450~900m2 / g, the pore volume It is 0.33~0.62ml / g, and the average pore size is 1.5~4.0nm. The composite molecular sieve has an obvious meso-microporous structure, which can increase the diffusion rate of reactants and products, reduce the chance of secondary cracking of molecules, provide conditions for the reaction of macromolecules, and improve the catalytic performance of molecular sieves.

Description

technical field [0001] The invention relates to a composite molecular sieve and a preparation method thereof, in particular to a USY-Y composite molecular sieve 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 4.5) 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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/08C01B39/24
Inventor 秦波杜艳泽柳伟张晓萍王凤来
Owner CHINA PETROLEUM & CHEM CORP