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USY molecular sieve and preparation method thereof

A molecular sieve and molar ratio technology, applied in molecular sieve catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve problems such as poor hydrothermal stability, nano Y-type molecular sieves that cannot be widely promoted, and crystal channel topology collapse. , to 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

AI Technical Summary

Problems solved by technology

However, due to the poor hydrothermal stability of the synthesized nano Y-type molecular sieve, the crystal channel topology completely collapsed during the hydrothermal treatment process.
Therefore, nano Y-type molecular sieves cannot be widely promoted in practical applications.

Method used

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  • USY molecular sieve and preparation method thereof
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) According to the molar ratio of n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=18.4:1:19.8:370, 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 30°C for 1 day to obtain the directing agent .

[0027] (2) According to the molar ratio of each material in the gel (excluding the added nano Y-type molecular sieve) is n (NaOH): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=14:1:24:520. Under the condition of stirring, add water, aluminum source, sodium hydroxide and water glass into the beaker in order to form a mixed solution, then add nano Y-type molecular sieve and the directing agent prepared in step (1), stir well Constant temperature crystallization at 100°C for 60 hours. Then after cooling, washing, suction filtration and drying, Y-Y composite molecular sieves are obtained, wherein the quality of the added nanometer Y-type molecular sieve accounts for 8wt% of t...

Embodiment 2

[0032] (1) According to the molar ratio of n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=18:1:19:350, 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 .

[0033] (2) According to the molar ratio of each material in the gel (excluding the added nano Y-type molecular sieve) is n (NaOH): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=15:1:21:580. Under the condition of stirring, add water, sodium aluminate, sodium hydroxide and water glass into the beaker in turn to form a mixed solution, then add nano Y-type molecular sieve and the directing agent prepared in step (1), stir well and pour the condensed The glue was crystallized at a constant temperature of 95°C for 48 hours. Then after cooling, washing, suction filtration and drying, Y-Y composite molecular sieves are obtained, wherein the quality of the added nanometer Y-type mole...

Embodiment 3

[0038] (1) According to the molar ratio of n (Na 2 O): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=18:1:19:330, 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 50°C for 0.5 days to obtain the directing agent .

[0039] (2) According to the molar ratio of each material in the gel (excluding the added nano Y-type molecular sieve) is n (NaOH): n (Al 2 o 3 ): n (SiO 2 ): n (H 2 O)=15:1:24:600. Under the condition of stirring, add water, sodium aluminate, sodium hydroxide and water glass into the beaker in turn to form a mixed solution, then add nano Y-type molecular sieve and the directing agent prepared in step (1), stir well and pour the condensed The glue was crystallized at a constant temperature of 98° C. for 48 hours. Then after cooling, washing, suction filtration and drying, Y-Y composite molecular sieves are obtained, wherein the quality of the nano Y-type molecular s...

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Abstract

The invention discloses a USY molecular sieve. The USY molecular sieve has a hollow structure. The USY molecular sieve has a silicon oxide-alumina mole ratio of 4.5-25, the grain size of 0.5-1.2 microns, a specific surface area of 420-800m<2> / g, a pore volume of 0.33-0.82ml / g and an average aperture size of 1.5-4.0nm. The USY molecular sieve has more exposed reaction active sites, greatly shortens a diffusion distance of reactants and improves molecular sieve catalysis performances.

Description

technical field [0001] The invention relates to a USY 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 4.2) 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...

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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