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Method for synthesizing SSZ-39 molecular sieve by seed crystal method

A technology of SSZ-39 and molecular sieve, applied in the field of molecular sieve, can solve problems such as high synthesis cost, achieve the effects of reducing preparation cost, solving high synthesis cost and low cost

Active Publication Date: 2022-06-03
淮安六元环新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, it is imminent to develop a new method for synthesizing SSZ-39 zeolite molecular sieve to solve the problem of high synthesis cost

Method used

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  • Method for synthesizing SSZ-39 molecular sieve by seed crystal method
  • Method for synthesizing SSZ-39 molecular sieve by seed crystal method
  • Method for synthesizing SSZ-39 molecular sieve by seed crystal method

Examples

Experimental program
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Effect test

Embodiment 1

[0045] Synthesis of SSZ-39 molecular sieve by tetraethylammonium hydroxide as the seed crystal method of template:

[0046] 0.049gNaAlO 2 , 0.2g NaOH and 1.96g tetraethylammonium hydroxide solution were dissolved in 3.56g water, stirred for 10 minutes, then added 3.32g silica sol and stirred for two hours, then added 0.1g SSZ-39 seed crystal; then added the reaction raw materials into polytetrafluoroethylene In an ethylene stainless steel reactor, crystallize at 140°C for 48 hours to complete the crystallization, filter the product with suction, and dry at 40°C for 30 minutes to obtain the product. Wherein, the seed crystal content accounts for 10% of the total amount of silicon dioxide.

[0047] The molecular sieve structure of embodiment 1 analyzed by X-ray diffraction is SSZ-39 zeolite molecular sieve (such as figure 1 ), and it can be seen from the scanning electron microscope that the synthesized product presents a uniform cubic shape. figure 2 It is a scanning electr...

Embodiment 2

[0049] Synthesis of SSZ-39 molecular sieve by tetraethylammonium hydroxide as the seed crystal method of template:

[0050] 0.049gNaAlO 2 , 0.2g NaOH and 1.96g tetraethylammonium hydroxide solution were dissolved in 3.56g water, stirred for 10 minutes, then added 3.32g silica sol and stirred for two hours, then added 0.1g SSZ-39 seed crystal; then added the reaction raw materials into polytetrafluoroethylene In an ethylene stainless steel reactor, crystallize at 120°C for 72 hours to complete the crystallization, filter the product with suction, and dry at 45°C for 30 minutes to obtain the product. Wherein, the seed crystal content accounts for 10% of the total amount of silicon dioxide.

[0051] image 3It is a scanning electron micrograph (SEM) of the SSZ-39 molecular sieve product synthesized in Example 2, and the particle size is about 480nm.

Embodiment 3

[0053] Synthesis of SSZ-39 molecular sieve by tetraethylammonium hydroxide as the seed crystal method of template:

[0054] 0.049gNaAlO 2 , 0.2g NaOH and 1.96g tetraethylammonium hydroxide solution were dissolved in 3.56g water, stirred for 10 minutes, then added 3.32g silica sol and stirred for two hours, then added 0.03g SSZ-39 seed crystal; then added the reaction raw materials into polytetrafluoroethylene In an ethylene stainless steel reaction kettle, crystallize at 160°C for 24 hours to complete crystallization, filter the product with suction, and dry at 50°C for 20 minutes to obtain the product. Among them, the seed crystal content accounts for 3% of the total amount of silicon dioxide.

[0055] Figure 4 It is a scanning electron micrograph (SEM) of the SSZ-39 molecular sieve product synthesized in Example 3, and the particle size is about 490nm.

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Abstract

The invention provides a method for synthesizing an SSZ-39 molecular sieve by a seed crystal method, and belongs to the technical field of molecular sieves. The preparation method comprises the following steps: mixing an aluminum source, an alkali source, a template agent, a silicon source and water into gel; and mixing the SSZ-39 molecular sieve seed crystal and the gel, and sequentially carrying out crystallization treatment, suction filtration and drying to obtain the SSZ-39 molecular sieve. According to the method, low-cost TEAOH is adopted as a template agent to fill pore channels of a product in a seed crystal guiding process, low-cost synthesis of the SSZ-39 molecular sieve is realized for the first time based on seed crystal induction of the molecular sieve and pore channel filling of the cheap TEAOH template agent, namely, synthesis is performed without using two expensive raw materials, namely piperidinyl quaternary ammonium base and a Y molecular sieve, and the synthesis cost is reduced. And the obtained SSZ-39 molecular sieve is cubic in morphology and uniform in particle size.

Description

technical field [0001] The invention relates to the technical field of molecular sieves, in particular to a method for synthesizing SSZ-39 molecular sieves by a seed crystal method. Background technique [0002] Zeolite molecular sieve materials, including silica-alumina molecular sieves, phosphorus-aluminum molecular sieves, etc., are widely used in petrochemical, fine chemistry and environmental protection and other fields. Among them, SSZ-39 molecular sieve is a silica-alumina molecular sieve with a typical AEI topology, and its basic structure is a double six-membered ring system. Due to the unique pore structure and suitable acid distribution, SSZ-39 molecular sieve has been widely used in CO 2 During gas adsorption separation and MTO reaction. In addition, SSZ-39 molecular sieves are highly effective in the selective catalytic reduction of nitrogen oxides (NH 3 -SCR) has superior performance in the reaction, which has attracted extensive attention and attention from...

Claims

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Application Information

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IPC IPC(8): C01B39/48C01B39/04
CPCC01B39/48C01B39/04C01P2002/72C01P2004/03C01P2004/62Y02P30/40
Inventor 刘宝刚耿丽
Owner 淮安六元环新材料有限公司
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