Synthesis method for ZSM-5 molecular sieve of special morphology

A technology of ZSM-5 and morphology, applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of not getting petal-shaped ZSM-5 zeolite, etc., and achieve good practicality Sexuality and effectiveness, improving synthesis efficiency, and avoiding cumbersome steps

Active Publication Date: 2016-02-03
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the method described in the above patents, the template agent R1 used in the present invention is rarely used, and it is basically static crystallization. The crystallization process is not stirred, and petal-shaped ZSM-5 zeolite cannot be obtained.

Method used

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  • Synthesis method for ZSM-5 molecular sieve of special morphology
  • Synthesis method for ZSM-5 molecular sieve of special morphology
  • Synthesis method for ZSM-5 molecular sieve of special morphology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Synthesis method: add 1.7g of sodium hydroxide solution with a mass fraction of 40%, 1g of sodium fluoride, 0.38g of n-propylamine, 1.6g of hexamethylenetetramine, and 0.051g of aluminum sulfate octadecahydrate into 15g of water, stir well, and then add 5 g of silica sol with a mass fraction of 40% was stirred for 30 min, and the gel was aged for 8 h at room temperature. After that, it was crystallized at 180°C and stirred at 150rpm for 5 days, cooled to room temperature, washed with deionized water and centrifuged three times, and dried at 80°C for 12 hours to obtain the final product.

[0030] figure 1 It is the XRD spectrogram of the product obtained in Example 1, it can be seen that the product has the characteristic diffraction peak of ZSM-5, and has a higher crystallinity. figure 2 , image 3 It is the SEM photo of the product obtained in Example 1 with different magnifications. It can be seen that the sample presents a special petal-shaped appearance, and the ...

Embodiment 2

[0032] 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 has a petal-shaped morphology.

Embodiment 3

[0034] 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-shaped morphology.

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Abstract

The invention belongs to the technical field of zeolite molecular sieve synthesis, in particular to a synthesis method for a ZSM-5 zeolite molecular sieve of a petaloid morphology. According to the synthesis method, morphology control is an important aspect in the field of molecular sieve synthesis; when MFI zeolite molecular sieve catalysts of different crystal morphologies are adopted in a catalytic reaction, all of the product selectivity, the reaction activity, the reaction stability and the like can be changed obviously along with the morphology difference. The invention further relates to a preparation method for ZSM-5 zeolite. The synthesis method provided by the invention has the advantages that the synthesis process is simple and convenient, and industrialization is easy to realize; meanwhile, a plurality of templates are applied, so as to effectively control the product crystallinity and the final morphology; sample XRD shows that the obtained product is the ZSM-5 molecular sieve of which the product crystallinity is high; sample SEM shows that zeolite has a special petaloid morphology, and thus can be utilized for industrial production of ZSM-5 zeolite of the special petaloid 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 sieve with a special shape. 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 method, the mesopo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40
Inventor 史静滕加伟谢在库赵国良
Owner CHINA PETROLEUM & CHEM CORP
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