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Method for preparing MWW structure molecular sieve

A technology of molecular sieves and molecules, which is applied in the field of preparing molecular sieves with MWW structures, can solve the problems of severe aggregation, poor dispersion, and long crystallization time

Active Publication Date: 2015-07-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the molecular sieve with MWW structure has high synthetic water-to-sil

Method used

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  • Method for preparing MWW structure molecular sieve
  • Method for preparing MWW structure molecular sieve
  • Method for preparing MWW structure molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0052] This example illustrates the method provided by the invention.

[0053] Sodium hydroxide was dissolved in deionized water, stirred until completely dissolved, solid silica gel and industrial sample NaY (grain size about 1.0 μm, Na 2 O content is 11.8w%, SiO 2 / Al 2 o 3 =4.95) Molecular sieves were added to the above solution, and after stirring evenly, hexamethyleneimine was added, and stirring was continued. The colloidal molar ratio of the resulting mixture is: 0.18NaOH:SiO 2 : 0.04Al 2 o 3 :0.30HMI: 15H 2 O. Then, the obtained mixture was transferred to a closed crystallization kettle, the crystallization temperature was 145°C, and the dynamic crystallization was performed for 72 hours. After cooling, the product was taken out, and after filtration, washing, drying and roasting, the sample number FM-1 was obtained.

[0054] Test its XRD diffraction pattern ( figure 1 ), the 2θ angle is 5 to 35°. The product is MCM-49 molecular sieve with a relative crystall...

Embodiment 2

[0056] This example illustrates the method provided by the invention.

[0057] Sodium hydroxide was dissolved in deionized water, stirred until completely dissolved, solid silica gel and NH 4 Y molecular sieve (obtained by two ammonium exchanges at 90°C, the grain size is about 1.0 μm, Na 2 O content is 0.34w%, SiO 2 / Al 2 o 3 =4.95) into the above solution, and after stirring evenly, add hexamethyleneimine, and continue stirring evenly. The colloidal molar ratio of the resulting mixture is: 0.18NaOH:SiO 2 : 0.04Al 2 o 3 :0.30HMI: 15H 2 O. Then, the obtained mixture was transferred to a closed crystallization kettle, the crystallization temperature was 145°C, and the dynamic crystallization was performed for 64 hours. After cooling, the product was taken out, and after filtration, washing, drying and roasting, the sample number FM-2 was obtained.

[0058] Test its XRD diffraction pattern ( figure 2 ), the 2θ angle is 5 to 35°. The product is MCM-49 molecular sieve ...

Embodiment 3

[0060] This example illustrates the method provided by the invention.

[0061] Sodium hydroxide was dissolved in deionized water, stirred until completely dissolved, and solid silica gel and HY molecular sieve (obtained by ammonium exchange roasting at 90°C twice, with a grain size of about 1.0 μm, SiO 2 / Al 2 o 3 =4.95) into the above solution, after stirring evenly, add hexamethyleneimine, and continue stirring evenly. The colloidal molar ratio of the resulting mixture is: 0.18NaOH:SiO 2 : 0.04Al 2 o 3 :0.30HMI: 15H 2 O. Then, the obtained mixture was transferred to a closed crystallization kettle, the crystallization temperature was 145°C, and the dynamic crystallization was performed for 64 hours. After cooling, the product was taken out, and after filtration, washing, drying and roasting, the sample number FM-3 was obtained.

[0062] Test its XRD diffraction pattern ( image 3 ), the 2θ angle is 5 to 35°. The product is MCM-49 molecular sieve with a relative crys...

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Abstract

The invention discloses a method for preparing an MWW structure molecular sieve. The method comprises the following steps: crystallizing a mixture colloid formed by an FAU structure molecular sieve, a silicon source, an alkali source, a template and deionized water under hydrothermal conditions, and recovering to obtain the MWW structure molecular sieve. The method allows the MWW structure molecular sieve to be prepared through direct crystal transformation of the FAU structure molecular sieve, and the crystal size of the product MWW structure molecular sieve is similar to the particle size of the raw material FAU structure molecular sieve.

Description

technical field [0001] The invention relates to a method for preparing molecular sieves with MWW structure, more precisely, a method for preparing molecular sieves with MWW structure through crystal transformation. Background technique [0002] Molecular sieves with MWW structure include molecular sieves such as MCM-22, MCM-49, MCM-36, MCM-56, ITQ-1 and ITQ-2. In 1990, Mobil Corporation first hydrothermally synthesized MCM-22 molecular sieve (US, 4954325, 1990) using hexamethyleneimine (HMI) as a template agent, and its structure was first analyzed in 1994, and it was named after it. Molecular sieves with MWW structure, so 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×...

Claims

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Application Information

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IPC IPC(8): C01B39/04B01J29/70
Inventor 石艳春邢恩会张凤美谢文华慕旭宏刘强王卫东秦凤明舒兴田
Owner CHINA PETROLEUM & CHEM CORP