Beta zeolite and preparation method thereof

A beta zeolite and mesoporous technology, applied in the field of beta zeolite and its preparation, can solve the problems of the inaccessibility of the active center, the influence of the catalytic activity and selectivity, the secondary reaction, etc., to accelerate the crystal growth rate and the preparation method is simple. Economical, low diffusion resistance effect

Active Publication Date: 2017-05-17
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 limitation of the relatively narrow micropore channel of Beta zeolite, on the one hand, some molecules with a molecular dynamic diameter larger than the zeolite micropore cannot enter the pores, resulting in the inaccessibility of the active center and affecting its application range. On the other hand, the product molecules cannot diffuse in time due to the limitation of micropores, resulting in secondary reactions and even carbonization, which seriously affects its catalytic activity and selectivity.

Method used

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  • Beta zeolite and preparation method thereof
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  • Beta zeolite and preparation method thereof

Examples

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Effect test

Embodiment 1

[0023] (1) Add deionized water into the stirred tank, start the stirrer and add surfactant, then add fumed silica into the stirred tank, then seal the stirred tank and raise the temperature to 150°C, and pass through Enter air to maintain the pressure in the kettle at 0.5 MPa, stir at constant temperature for 4 hours and then cool down to 50°C; add tetraethylammonium bromide, sodium aluminate and sodium hydroxide into the stirred kettle, and stir evenly;

[0024] (2) Seal the stirred tank and raise the temperature to 140°C. After stirring at constant temperature for 5 days, control the pressure at 0.38MPa by controlling the pressure relief valve, and crystallize at constant temperature for 2 days;

[0025] (3) Close the pressure relief valve, and continue the constant temperature crystallization at 140°C for 3 days. After the crystallization is completed, flush water into the kettle to quickly reduce the temperature in the kettle to below 80°C, then release the pressure, and pu...

Embodiment 2

[0027] (1) Add deionized water into the stirred tank, start the stirrer and add surfactant, then add white carbon black into the stirred tank, then seal the stirred tank and raise the temperature to 140°C, and pass through selectively Keep the pressure in the kettle at 0.7MPa with air, stir at constant temperature for 3 hours and then cool down to 50°C; add tetraethylammonium hydroxide, aluminum sulfate and sodium hydroxide into the stirred kettle, and stir evenly;

[0028] (2) Seal the stirred tank, raise the temperature to 150°C, stir at constant temperature for 2 days, control the pressure at 0.36MPa by controlling the pressure relief valve, and crystallize at constant temperature for 4 days;

[0029] (3) Close the pressure relief valve, and continue the constant temperature crystallization at 145°C for 6 days. After the crystallization is completed, flush water into the kettle to quickly reduce the temperature in the kettle to below 80°C, then release the pressure, and pump...

Embodiment 3

[0031] (1) Add deionized water into the stirred tank, start the stirrer and add surfactant, then add white carbon black into the stirred tank, then seal the stirred tank and raise the temperature to 140°C, and pass through selectively Keep the pressure in the kettle at 0.4MPa with air, stir at constant temperature for 4 hours and then cool down to 40°C; add tetraethylammonium bromide, aluminum nitrate and sodium hydroxide into the stirred kettle, and stir evenly;

[0032] (2) Seal the stirred tank and raise the temperature to 155°C. After stirring at constant temperature for 2 days, control the pressure at 0.38MPa by controlling the pressure relief valve, and crystallize at constant temperature for 3 days;

[0033] (3) Close the pressure relief valve, and continue the constant temperature crystallization at 140°C for 7 days. After the crystallization is completed, flush water into the kettle to quickly reduce the temperature in the kettle to below 80°C, then release the pressur...

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Abstract

The invention discloses a Beta zeolite and a preparation method thereof. The Beta zeolite has the properties as follows: the total pore volume is 0.45-0.99ml/g, the mesoporous pore volume is 0.25-0.89ml/g, the specific surface is 550-1,000m<2>/g, the mesoporous specific surface is 200-600m<2>/g, the volume ratio of the pore volume to the total pore volume is 0.56-0.9 and the acid content is 0.30-0.85mmol/g. The preparation method comprises the steps of (1) mixing deionized water, a surfactant and a silicon source in an agitated vessel evenly, heating the agitated vessel to maintain certain pressure in the agitated vessel and adding a template agent, an aluminum source and sodium hydroxide to the agitated vessel; (2) controlling the certain pressure in the agitated vessel for crystallization; and (3) closing a decompression valve, further carrying out constant-temperature crystallization, carrying out decompression, carrying out solid-liquid separation on the crystallization product, washing, drying and roasting to obtain the Beta zeolite. The Beta zeolite crystal particles have a lot of mesoporous channel structures, the mesoporous specific surface and the mesoporous pore volume are improved, mesoporous channels are communicated with microporous channels; and the diffusibility of the Beta zeolite is greatly improved. According to the method, the operation is simple in the preparation process, the production cost is low and the beta zeolite is suitable for massive industrial production.

Description

technical field [0001] The invention belongs to the field of molecular sieve synthesis, and in particular relates to a Beta zeolite and a preparation method thereof. Background technique [0002] Beta zeolite is the only large-pore high-silica zeolite with a three-dimensional twelve-membered ring straight channel system. Compared with Y-type zeolite, it has a large range of adjustable silicon-aluminum ratio, which makes it exhibit higher hydrothermal stability and strong acidity than FAU; compared with ZSM-5, it has a larger micropore diameter , making it conducive to the diffusion of molecules, especially those with relatively large volumes, in it. In conclusion, due to its unique crystal structure and composition, Beta zeolite exhibits excellent performance in terms of hydrothermal stability, molecular shape selectivity, active site stability, coking resistance, and hydrophobicity, and can be used as a catalyst for low-pressure hydrocracking , hydroisomerization, dewaxin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 秦波杜艳泽柳伟张晓萍
Owner CHINA PETROLEUM & CHEM CORP
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