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Synthetic method of zsm-5 molecular sieve with special morphology

A ZSM-5, morphology technology, applied in the direction of crystalline aluminosilicate zeolite, borane silicone crystalline aluminosilicate zeolite, etc., can solve problems such as uncontrollable particle size

Active Publication Date: 2020-07-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The key technical problem to be solved by the present invention is that the preparation of petal-shaped ZSM-5 in the prior art requires the use of mineralizers, and the problem of uncontrollable particle size

Method used

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  • Synthetic method of zsm-5 molecular sieve with special morphology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Synthesis method: Add 1.7g of 40% sodium hydroxide solution, 0.38g of n-propylamine, 1.6g of formamide, and 0.051g of aluminum sulfate octadecahydrate to 15g of water, stir well, then add 5g of 40% silica sol , stirred for 30 minutes, the room temperature was programmed to rise to 60°C at 0.83°C / min, after 1 day of crystallization, the temperature was programmed to rise to 100°C at 0.83°C / min, after 2 days of crystallization, the temperature was programmed to rise to 180°C at 0.83°C / min, and crystallized for 3 days . The crystallization process was carried out under stirring at 150 rpm. After cooling to room temperature, wash and centrifuge three times with deionized water, and dry at 80°C for 12 hours to obtain the final product. According to the XRD characterization results of the sample, it can be seen that the product has ZSM-5 characteristic diffraction peaks, figure 1 It is the SEM photo of the sample, which shows that the sample has a petal-like morphology, and...

Embodiment 2

[0026] Using the same conditions as in Example 1, changing the amount of n-propylamine to 4.2g, to obtain the final product. According to the XRD characterization results of the sample, it can be seen that the product has the characteristic diffraction peak of ZSM-5, and the SEM photo shows that the sample presents a petal-like shape with a petal-like diameter of 0.5-0.9 microns.

Embodiment 3

[0028] Using the same conditions as in Example 1, changing the water consumption is 8g, and the n-propylamine consumption is 1.8g to obtain the final product. According to the XRD characterization results of the sample, it can be seen that the product has the characteristic diffraction peak of ZSM-5, and the SEM photo shows that the sample has a petal-like shape and a petal-like diameter of 0.8 microns.

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Abstract

The invention belongs to the technical field of zeolite molecular sieve synthesis, and particularly relates to a synthesis method of a ZSM-5 zeolite molecular sieve with the controllable particle sizeand rod-like morphology. Morphological control and particle size control are important aspects in the field of molecular sieve synthesis, and the aspects such as product selectivity, reaction activity and stability of MFI zeolite molecular sieve catalysts with the different crystal morphologies possibly have obvious difference along with the different morphologies. The ZSM-5 zeolite is mainly prepared by using a one-pot method, and the synthesis step is easy and convenient and easy to industrialize; the sample crystallinity is good; and SEM shows that the zeolite is in a small-particle-sizepetal-shaped morphology.

Description

technical field [0001] The invention belongs to the technical field of zeolite molecular sieve synthesis, in particular to a method for synthesizing ZSM-5 zeolite molecular sieves with petal-like small particle size. Background technique [0002] Zeolite is a kind of microporous crystalline aluminosilicate (aluminosilicate), the skeleton is usually composed of the general chemical formula [M 2 (I),M(II)]O·Al 2 o 3 · nSiO2 2 mH 2 O, (where M(I) and M(II) are monovalent and divalent metals (usually Na, Ca, Ka, etc., n is the zeolite silicon-aluminum ratio) silicon-oxygen tetrahedron and aluminum-oxygen tetrahedron pass through Covalent bonds are connected to each other. Due to its unique adsorption properties, good thermal and hydrothermal stability, and high specific surface area, zeolite molecular sieves are widely used in many fields such as gas separation, industrial catalysis, and ion exchange. [0003] CN200910148591.6 introduces a ZSM-5 zeolite and its synthesis me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/40
CPCC01B39/40C01P2002/72C01P2004/03C01P2004/30C01P2004/62
Inventor 史静滕加伟徐建军
Owner CHINA PETROLEUM & CHEM CORP
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