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Flake-like morphology zsm-5 molecular sieve and synthesis method

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: 2018-11-20
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 the crystallization process, or the synthesis process tends to be complicated, and it is not easy to industrialize, and it is impossible to obtain a uniform thin sheet ZSM-5 Zeolite

Method used

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  • Flake-like morphology zsm-5 molecular sieve and synthesis method
  • Flake-like morphology zsm-5 molecular sieve and synthesis method
  • Flake-like morphology zsm-5 molecular sieve and synthesis method

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Experimental program
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Effect test

Embodiment 1

[0035] Synthesis method: 2g of tetrapropylammonium hydroxide, 6g of piperidine, 0.051g of aluminum sulfate octahydrate, 5g of sodium fluoride into 40g of water, then add 5g of silica sol with a mass fraction of 20%, and stir it evenly, at room temperature Gel aging. Afterwards, it was crystallized at 180°C and 150rpm stirring for 2 days, after cooling to room temperature, washed with deionized water and centrifuged 3 times, and dried at 80°C for 12 hours to obtain the final product.

[0036] figure 1 This is the XRD spectrum 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 high degree of crystallinity. figure 2 , image 3 These are SEM photos of the product obtained in Example 1 with different magnifications. It can be seen that the sample has a sheet-like morphology with a thickness of about 100 nm.

Embodiment 2

[0038] Using the same conditions as in Example 1, the amount of tetrapropylammonium hydroxide was changed to 18 g to obtain the final product. The XRD characterization result of the sample shows that the product has a characteristic diffraction peak of ZSM-5, and the SEM photo shows that the sample has a flaky morphology.

Embodiment 3

[0040] Using the same conditions as in Example 1, and changing the amount of water to 88 g, the final product was obtained. The XRD characterization result of the sample shows that the product has a characteristic diffraction peak of ZSM-5, and the SEM photo shows that the sample has a flaky 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 is specifically a method for synthesizing a flake-shaped ZSM-5 zeolite molecular sieve. Background technique [0002] With different morphologies, ZSM-5 catalysts exhibit different catalytic effects. Among them, the flaky morphology of ZSM-5 zeolite (grows relatively fast along the a-axis direction, that is, the (010) crystal plane is larger, and grows slowly along the b-axis direction, and the (100) crystal plane is smaller and the cross section is rectangular) phase Compared with the conventional morphology zeolite, it shows good catalytic performance and excellent carbon deposition resistance. It can be said that the adjustment of the morphology and orientation of the molecular sieve has an important influence on its practical application effect. [0003] CN201310020530.8 introduces a ZSM-5 zeolite synthesis method, which uses polar molecules, namely cetyltrimethylammo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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