Preparation method of hollow USY molecular sieve

A molecular sieve and composite molecular sieve technology, which is applied in the field of preparation of hollow USY molecular sieves, can solve the problems of poor hydrothermal stability and cannot be used in industrial applications, and achieve the effects of 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

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Problems solved by technology

[0005] At the same time, the synthesis of Y with different silicon-aluminum ratios has attracted the attention of many researchers. It is generally beli...

Method used

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  • Preparation method of hollow USY molecular sieve
  • Preparation method of hollow USY molecular sieve
  • Preparation method of hollow USY molecular sieve

Examples

Experimental program
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Embodiment 1

[0024] According to molar ratio n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=18:1:19:370, under stirring, add sodium aluminate, sodium hydroxide, water, 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 .

Embodiment 2

[0026] According to molar ratio n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=17:1:120:390, under stirring, add sodium aluminate, sodium hydroxide, water, and water glass to the beaker in turn to form a mixed solution, and then age at 35°C for 1.5 days to obtain the directing agent .

Embodiment 3

[0028] According to molar ratio n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=16:1:121:360, in the state of stirring, add sodium aluminate, sodium hydroxide, water, and water glass to the beaker in turn to form a mixed solution, and then age at 40°C for 1 day to obtain the directing agent .

[0029] Composite molecular sieve preparation:

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Abstract

The invention discloses a preparation method of a hollow USY molecular sieve. The preparation method comprises 1, preparing a guiding agent, 2, preparing a mixed solution from an aluminum source, water and sodium hydroxide, adding a low silica-alumina ratio NaY molecular sieve and the guiding agent obtained through the step 1 into the mixed solution, carrying out uniform stirring, carrying out constant temperature crystallization on the gel at a temperature of 90-120 DEG C for 12-72h and carrying out cooling, washing, pumping filtration and drying to obtain a Y-Y composite molecular sieve, 3, carrying out ammonium exchange on the Y-Y composite molecular sieve prepared through the step 2, 4, treating the Y-Y composite molecular sieve subjected to ammonium exchange under hydro-thermal conditions and 5, washing the composite molecular sieve subjected to hydro-thermal treatment in the step 4 to obtain the hollow USY molecular sieve. The USY molecular sieve has more exposed reaction active sites, greatly shortens a reactant diffusion distance and improves molecular sieve catalysis performances.

Description

technical field [0001] The invention relates to a preparation method of a hollow USY molecular sieve. 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) has good hydrothermal stability and a...

Claims

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Application Information

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