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MWW-structure molecular sieve and preparation method thereof

A molecular sieve and desorption technology, applied in the direction of crystalline aluminosilicate zeolite, etc., can solve the problems of molecular sieve framework damage, poor controllability of desiliconization, etc., and achieve the effect of crystal particle dispersion and increased disorder.

Active Publication Date: 2016-10-05
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0007] The post-treatment of molecular sieves with MWW structure mostly focuses on the treatment of inorganic alkali NaOH. Due to the strong alkalinity of NaOH, the controllability of desilication is poor.
Although the molecular sieve framework can be selectively protected by introducing organic amines, the damage to the molecular sieve framework by NaOH is still inevitable.

Method used

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  • MWW-structure molecular sieve and preparation method thereof
  • MWW-structure molecular sieve and preparation method thereof
  • MWW-structure molecular sieve and preparation method thereof

Examples

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preparation example Construction

[0036] Preparation method provided by the invention, R1 / SiO in said mixture 2 =0.05~0.5, R2 / SiO 2 =0~0.5, namely R2 / SiO 2 When the endpoint value of the range of is zero, it means that the nitrogen-containing organic base R1 can be used alone. The method of using nitrogen-containing organic base R1 alone is especially suitable for the case where the raw material MWW molecular sieve has complete crystallization, for example, the relative crystallinity of the raw material MWW structure molecular sieve is generally required to be ≥ 100%. This method can achieve a significant increase in the specific surface area, pore volume and 2,4,6-collidine adsorption of the MWW structure molecular sieve product sample under the premise of a slight decrease in crystallinity.

[0037] In the preparation method provided by the present invention, the simultaneous treatment of nitrogen-containing organic base R1 and organic amine R2 is especially suitable for MWW structure molecular sieves with...

Embodiment 1

[0052] This example illustrates the molecular sieve provided by the present invention and its preparation method.

[0053] In the above comparative example 1, the MCM-22 sample without roasting and containing hexamethyleneimine is MCM-22P molecular sieve, and the MCM-22 sample that has been roasted and has removed hexamethyleneimine is MCM-22C molecular sieve .

[0054] Add tetraethylammonium hydroxide solution (TEAOH, 25wt.%) into deionized water, then add MCM-22P or MCM-22C molecular sieves to the above solution, continue to stir evenly, and the colloidal molar ratio of the obtained mixture is SiO 2 :0.1TEAOH:15H 2O. The colloid of the obtained mixture was transferred to a closed crystallization kettle, and the crystallization temperature was 150°C for dynamic crystallization for 16 hours. After cooling, the product was taken out. After filtering, washing, drying and roasting, the treated molecular sieve powder, MCM-22P was obtained. The number of the corresponding proces...

Embodiment 2

[0068] This example illustrates the molecular sieve provided by the present invention and its preparation method.

[0069] Tetraethylammonium hydroxide solution (25wt.%) was added to deionized water, and then MCM-49 containing hexamethyleneimine without roasting in Comparative Example 2 was added to the above solution and continued to stir evenly. The colloidal molar ratio of the resulting mixture is SiO 2 :0.1TEAOH:15H 2 O. Then, the obtained mixture was transferred to a closed crystallization kettle, the crystallization temperature was 150°C, and the dynamic crystallization was performed for 16 hours. After cooling, the product was taken out. After filtering, washing, drying and roasting, the modified molecular sieve raw powder was obtained. Sample No. for A-2-1.

[0070] The same as above, the difference is that the MCM-49 containing hexamethyleneimine that has not been roasted in Comparative Example 2 is replaced by the MCM-49 that has been roasted and has removed hexam...

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Abstract

The invention discloses a molecular sieve with a MWW structure, which is characterized in that the nitrogen adsorption-desorption BJH curve of the molecular sieve shows that the nitrogen desorption amount at 3.8±0.5nm is 0.01-0.10cm 3 / g, and the adsorption capacity of 2,4,6-collidine after adsorption at 20°C and desorption at 200°C is ≥35 μmol / g.

Description

technical field [0001] The present invention relates to a molecular sieve and its preparation method, more specifically to a MWW structure molecular sieve and its preparation method. Background technique [0002] Molecular sieves with MWW structure include MCM-22, MCM-49, MCM-36, MCM-56, SSZ-25, ITQ-1, ITQ-2 and UZM-8 and other molecular sieves. In 1990, Mobil Corporation first used hexamethyleneimine as a template to hydrothermally synthesize MCM-22 molecular sieve (US, 4954325, 1990), and first analyzed its structure in 1994, and named it MWW structure molecular sieve. Therefore, layered molecular sieves with MWW topology are also called MCM-22 family molecular sieves. [0003] Molecular sieves with MWW structure have two sets of independent channels that do not intersect each other: the elliptical 10MR two-dimensional sinusoidal channel with a pore diameter of 0.40×0.59nm in the layer; the 12MR supercage with a pore size of 0.40×0.54nm The 10MR opening of the supercage ...

Claims

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Application Information

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IPC IPC(8): C01B39/04
Inventor 邢恩会石艳春谢文华张凤美慕旭宏刘强王卫东秦凤明舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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