Lamellar ZSM-5 molecular sieve and synthesis method thereof

A ZSM-5, flake-like technology, applied in the field of synthesis of flake-shaped ZSM-5 zeolite molecular sieves, can solve the problems that are not easy to industrialize, cannot obtain uniform flake ZSM-5 zeolite, complex synthesis process, etc. Good parallelism, good catalytic effect, uniform product distribution effect

Active Publication Date: 2016-04-27
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In the method described in the above patents, the additive R2 used in the present invention is seldom used, and it is basically static crystallization. There is no stirring in

Method used

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  • Lamellar ZSM-5 molecular sieve and synthesis method thereof
  • Lamellar ZSM-5 molecular sieve and synthesis method thereof
  • Lamellar ZSM-5 molecular sieve and synthesis method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0035] Synthesis method: add 2g tetrapropylammonium hydroxide, 6g piperidine, 0.051g aluminum sulfate octadecahydrate, 5g sodium fluoride to 40g water, then add 5g silica sol with a mass fraction of 20%, stir evenly, and put Gel aging. After that, it was crystallized at 180°C for 2 days under stirring at 150rpm, 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.

[0036] 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 photograph of the product obtained in Example 1 with different magnifications, and it can be seen that the sample presents a sheet-like morphology with a thickness of about 100 nm.

Embodiment 2

[0038] Using the same conditions as in Example 1, changing the amount of tetrapropylammonium hydroxide is 18g, 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, and the SEM photo shows that the sample has a sheet-like morphology.

Embodiment 3

[0040] Using the same conditions as in Example 1, changing the amount of water to 88g, 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, and the SEM photo shows that the sample has a sheet-like morphology.

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Abstract

The invention belongs to the technical field of zeolite molecular sieve synthesis and relates to a synthesis method of a lamellar ZSM-5 molecular sieve. Morphology control is important in the field of molecular sieve synthesis, in a catalytic reaction, product selectivity, reaction activity and stability of MFI zeolite molecular sieve catalysts with different morphologies have obvious difference because of morphology difference. The synthesis method mainly utilizes a one kettle way to prepare ZSM-5 zeolite, has simple synthesis processes and can be industrialized easily. Through use of an effective additive, product crystallinity and final morphology can be effectively controlled. A sample XRD shows that the product is the ZSM-5 molecular sieve and has good crystallinity. SEM shows that the zeolite has lamellar morphology and can be used for olefin cracking industrial application.

Description

technical field [0001] The invention belongs to the technical field of zeolite molecular sieve synthesis, and in particular relates to a method for synthesizing a ZSM-5 zeolite molecular sieve with a thin sheet shape. Background technique [0002] With different morphology, ZSM-5 catalysts showed different catalytic effects. Among them, ZSM-5 zeolite with flake shape (grows relatively fast along the a-axis direction, that is, the (010) crystal plane is large, but grows slowly along the b-axis direction, the (100) crystal plane is small, and the cross-section is rectangular) phase Compared with the conventional shape zeolite, it shows good catalytic performance and excellent anti-carbon deposition ability. It can be said that the regulation of molecular sieve morphology and orientation has an important impact on its practical application effect. [0003] CN201310020530.8 introduces a ZSM-5 zeolite synthesis method, which uses polar molecules, namely cetyltrimethylammonium b...

Claims

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Application Information

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IPC IPC(8): C01B39/40
Inventor 史静滕加伟谢在库赵国良徐建军
Owner CHINA PETROLEUM & CHEM CORP
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