Synthetic method of Beta zeolite

A technology of beta zeolite and synthesis method, which is applied in the direction of chemical instruments and methods, crystalline aluminosilicate zeolite, molecular sieve catalyst, etc., can solve the problems of immature synthesis technology of high-silicon Beta zeolite and cumbersome synthesis steps, etc., and achieve high acidity Density, high catalytic reaction efficiency, and the effect of suppressing the generation of impurity crystals

Active Publication Date: 2016-06-01
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the prior art discloses several synthesis methods of Beta zeolite with low silicon-to-aluminum ratio, the synthesis technology of high-silicon Beta zeolite is not yet mature, and its synthesis steps are relatively cumbersome.

Method used

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  • Synthetic method of Beta zeolite
  • Synthetic method of Beta zeolite

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Experimental program
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Effect test

Embodiment 1

[0026] First, put 16g of aluminum nitrate in a high-temperature furnace and roast at 500°C for 3 hours to obtain alumina; then take 0.27g of sodium hydroxide, 0.1g of sodium aluminate, and 30mL of 25% tetraethylammonium hydroxide in 50mL of distilled water, and stir Until it is completely dissolved, add 8g of white carbon black, mix it with alumina after stirring evenly, put it into a closed reaction kettle after stirring evenly, and crystallize in an oven at 140°C for 48h. The obtained product was washed 4 times with distilled water to neutrality, and then dried at 120°C for 12 hours. The obtained sample number was CL1, and the obtained sample was as follows: figure 1 As shown, it is pure Beta zeolite without other impurities.

Embodiment 2

[0028] First, put 10g of aluminum sulfate in a high-temperature furnace and roast at 550°C for 2 hours to obtain alumina; then take 0.27g of sodium hydroxide, 0.1g of sodium aluminate, and 30mL of 25% tetraethylammonium hydroxide in 50mL of distilled water. Stir until it is completely dissolved, then add 8g of silica gel, mix with alumina after stirring evenly, put it into a closed reaction kettle after stirring evenly, and crystallize in an oven at 140°C for 40h. The obtained product was washed 4 times with distilled water to neutrality, and then dried at 120° C. for 12 hours. The obtained sample was Beta zeolite, coded as CL2.

Embodiment 3

[0030] First, put 12g of aluminum nitrate in a high-temperature furnace and roast at 700°C for 2.5h to obtain alumina; then take 0.3g of potassium hydroxide, 0.2g of aluminum nitrate, and 30mL of 25% tetraethylammonium hydroxide in 50mL of distilled water. Stir until it is completely dissolved, then add 8.5g of white carbon black, mix with alumina after stirring evenly, put it into a closed reaction kettle after stirring evenly, and crystallize in an oven at 150°C for 50h. The obtained product was washed 4 times with distilled water to neutrality, and dried at 120°C for 12 hours. The obtained sample was Beta zeolite, coded as CL3.

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Abstract

The invention discloses a synthetic method of Beta zeolite. The synthetic method of Beta zeolite comprises the following steps: firstly placing aluminium nitrate into a high temperature furnace, and roasting to prepare special aluminium oxide; mixing inorganic base, an aluminium source, a silicon source, a template and water, and stirring to obtain silica-alumina gel; adding the above prepared aluminium oxide into silica-alumina gel; and finally carrying out hydrothermal crystallization to obtain Beta zeolite. The Beta zeolite synthesized by the method is low aluminium-silicon ratio zeolite, and has high degree of crystallinity. By the synthetic method, generation of foreign crystals is effectively avoided. In addition, the synthetic method is simple to operate and feasible.

Description

technical field [0001] The invention relates to a method for synthesizing Beta zeolite, in particular to a method for synthesizing Beta zeolite with a low silicon-aluminum ratio, and belongs to the field of synthesizing molecular sieve catalytic materials. Background technique [0002] Beta zeolite was synthesized for the first time by Mobil Corporation in 1967. Due to the long-term failure to solve the problem of its structure determination, it has not attracted enough attention for a long time. Until 1988, when its characteristic three-dimensional structure was revealed, Beta zeolite attracted people's interest again. Beta zeolite has good thermal and hydrothermal stability, moderate acidity and thermal stability and hydrophobicity, and is the only large-pore high-silica molecular sieve with a crossed twelve-membered ring channel system, which exhibits hydrocarbon reactions in the catalytic process It is not easy to coke and has a long service life. It has excellent catal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04B01J20/18B01J29/06
Inventor 范峰凌凤香王少军张会成陈晓刚杨春雁
Owner CHINA PETROLEUM & CHEM CORP
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