Method for synthesizing Omega zeolite molecular sieve

A zeolite molecular sieve, aluminum source technology, applied in the direction of crystalline aluminosilicate zeolite, ZSM-4 type crystalline aluminosilicate zeolite, nanotechnology, etc., can solve the problem of non-green environmental protection, unfavorable Omega zeolite catalyst industrial production, synthesis cycle It can achieve the effect of simple and reliable preparation method, good adsorption and catalytic ability, good crystallinity and purity

Inactive Publication Date: 2020-12-08
INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It is worth noting that tetramethylammonium hydroxide is toxic and highly corrosive, which will accelerate the consumption of production equipment and pollute the environment during the synthesis of Omgea zeolite molecular sieve; dioxane is toxic and chemically carcinogenic, and the synthesis The route of Omega zeolite molecular sieve does not meet the requirements of green environmental protection; piperazine is combustible when exposed to high heat, and decomposes to release toxic gas, which greatly affects the ecological environment in the process of synthesizing Omega zeolite molecular sieve
The above-mentioned organic templates have the disadvantages of high cost, serious environmental pollution, and long synthesis cycle, which are not conducive to the industrial production of Omega zeolite catalysts.
Recently, researchers have discovered that Omega zeolite can also be synthesized by the template-free seed crystal method, but the required crystallization time is longer and the resulting product is more aluminum-rich, which affects its industrial application to a certain extent.

Method used

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  • Method for synthesizing Omega zeolite molecular sieve
  • Method for synthesizing Omega zeolite molecular sieve
  • Method for synthesizing Omega zeolite molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Embodiment 1: the preparation of Omega zeolite sample

[0018] First, dissolve 0.76g of sodium hydroxide in 8.9g of deionized water, add 0.486g of pseudoboehmite to it, after the solution is clarified, add 2.4g of fine silica gel, continue to stir, then slowly add 3.3g of choline and stir to a uniform gel; add the reaction raw materials into a polytetrafluoroethylene stainless steel reactor, and crystallize at 180°C for 0.25 days to complete the crystallization, cool at room temperature, wash with deionized water until neutral, and filter the product under suction at 100°C The product was obtained after air drying.

[0019] attached figure 1 It is the X-ray diffraction pattern (XRD) of the synthesized product, and its structure is Omega zeolite molecular sieve through X-ray diffraction analysis. attached figure 2 It is a scanning electron micrograph (SEM) of the synthesized sample, and it can be seen that the synthesized product presents a nanorod cluster morphology...

Embodiment 2

[0020] Embodiment 2: the preparation of Omega zeolite sample

[0021] First, dissolve 0.76g of sodium hydroxide in 8.9g of deionized water, add 0.486g of pseudoboehmite to it, after the solution is clarified, add 3.6g of fine silica gel, continue to stir, then slowly add 3.3g of choline and stir to a uniform gel; add the reaction raw materials into a polytetrafluoroethylene stainless steel reactor, and crystallize at 150°C for 1 day to complete the crystallization, cool at room temperature, wash with deionized water until neutral, and filter the product with suction and dry at 100°C The product was obtained after air drying.

Embodiment 3

[0022] Embodiment 3: the preparation of Omega zeolite sample

[0023] First, dissolve 0.76g of sodium hydroxide in 8.9g of deionized water, add 0.486g of pseudoboehmite to it, after the solution is clarified, add 1.6g of fine silica gel, continue to stir, then slowly add 3.3g of choline and stir to a uniform gel; add the reaction raw materials into a polytetrafluoroethylene stainless steel reactor, and crystallize at 150°C for 1 day to complete the crystallization, cool at room temperature, wash with deionized water until neutral, and filter the product with suction and dry at 100°C The product was obtained after air drying.

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Abstract

The invention discloses a method for quickly synthesizing an Omega zeolite molecular sieve, which comprises the following steps: uniformly mixing an aluminum source, an alkali source and deionized water, and adding a silicon source with stirring; continuously stirring the solution until the solution is uniform to form silica-alumina gel, adding a certain amount of choline into the silica-alumina gel, and then stirring the gel; adding zeolite molecular sieve raw powder into a reaction kettle, then putting the gel into the reaction kettle, crystallizing the gel for 0.25-2 days at the temperatureof 100-180 DEG C, and carrying out suction filtration, washing and drying on the product to obtain the Omega zeolite molecular sieve raw powder. The Omega zeolite molecular sieve is rapidly synthesized under hydrothermal synthesis conditions by taking choline as a template agent, has the advantages of short synthesis period, environmental friendliness and low cost, and conforms to the target of green sustainable development.

Description

technical field [0001] The invention belongs to a molecular sieve preparation method, in particular to a method for synthesizing an Omega zeolite molecular sieve with a green and cheap template agent. Background technique [0002] Zeolite molecular sieves are widely used in petrochemical and fine chemical processes because of their high specific surface area, large pore volume, and adjustable acid density. Omega zeolite molecular sieve has a one-dimensional 12-membered ring channel structure, which belongs to P6 3 / mmc space group. The pores of Omega zeolite catalysts have excellent shape selectivity and are used in the important hydroisomerization reactions in industrial catalysis. [0003] In the current reports on the preparation of Omega zeolite molecular sieves, commonly used organic templates include tetramethylammonium hydroxide, dioxane, piperazine and the like. It is worth noting that tetramethylammonium hydroxide is toxic and highly corrosive, which will acceler...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/34C01B39/04B82Y40/00
CPCB82Y40/00C01B39/04C01B39/34C01P2002/72C01P2004/03C01P2004/16
Inventor 章芬陈伟胡银宋卫国游胜勇饶国华
Owner INST OF APPLIED CHEM JIANGXI ACAD OF SCI
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