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Synthetic method for uniform nanosized ZSM-5 molecular sieve

A technology of ZSM-5 and synthesis method, which is applied in the direction of molecular sieve catalyst, nanotechnology, nanotechnology, etc., can solve the problems of complex preparation process and low crystallinity of uniform nano ZSM-5, and achieve good parallelism and good catalytic effect , The effect of shortening the crystallization time

Inactive Publication Date: 2017-05-10
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 uniform nano ZSM-5 crystallinity obtained by the prior art is low, and the preparation process is complex and cumbersome.

Method used

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  • Synthetic method for uniform nanosized ZSM-5 molecular sieve
  • Synthetic method for uniform nanosized ZSM-5 molecular sieve
  • Synthetic method for uniform nanosized ZSM-5 molecular sieve

Examples

Experimental program
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Effect test

Embodiment 1

[0023] Synthesis method: Add 2g of tetrapropylammonium hydroxide and 0.051g of aluminum sulfate octahydrate into 15g of water, stir evenly, add 5g of ethyl orthosilicate, and after stirring, add 0.35g of all-silicon silicalite-1 zeolite seed crystals, After stirring again, the gel ages at room temperature. Afterwards, it was put into a crystallization kettle, heated to 120°C, crystallized under 150rpm stirring for 1 day, after the reaction, cooled to room temperature, washed with deionized water and centrifuged 3 times, dried at 80°C for 12h, and roasted to obtain the final product.

[0024] Figure 1 It is the XRD spectrum of the product obtained in Example 1 Figure , It can be seen that the product has the characteristic diffraction peak of ZSM-5 and has high crystallinity. Figure 2 It is an SEM photo of the product obtained in Example 1. It can be seen that the sample has a uniform spherical morphology with a particle size of 100-200 nanometers.

Embodiment 2

[0026] Using the same conditions as in Example 1, the amount of tetrapropylammonium hydroxide was changed to 4.5 g to obtain the final product. The XRD characterization result of the sample shows that the product has characteristic diffraction peaks of ZSM-5. The SEM photo shows that the sample is a uniform nano-ZSM-5 molecular sieve with a slight increase in particle size.

Embodiment 3

[0028] Using the same conditions as in Example 1, and changing the amount of water to 38 g, the final product was obtained. The XRD characterization result of the sample shows that the product has characteristic diffraction peaks of ZSM-5. The SEM photo shows that the sample is a uniform nano-ZSM-5 molecular sieve.

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Abstract

The invention belongs to the technical field of synthesis of zeolite molecular sieves and particularly provides a synthetic method for a uniform nanosized ZSM-5 molecular sieve. A seeding method is mainly used, materials are added in a crystallization process to be stirred, ZSM-5 zeolite is prepared by one step, proper supplementing silicon source and aluminium source are selected, the mother liquor proportion is adjusted, and uniformly distributed nano-zeolite is prepared. The synthetic method adopts simple and convenient synthetic steps, and industrialization is easy. XRD (X-ray diffraction) of a sample shows that the product is the ZSM-5 molecular sieve with good degree of crystallinity. An SEM (scanning electron microscope) shows that nano-zeolite is uniformly distributed.

Description

Technical field [0001] The invention belongs to the technical field of zeolite molecular sieve synthesis, and is specifically a method for synthesizing uniform nano ZSM-5 zeolite molecular sieve. Background technique [0002] Compared with conventional zeolite, nano-zeolite has a larger external surface area, correspondingly more reactive sites will be exposed on the surface, which can greatly improve the activity in the catalytic reaction of macromolecules. In traditional small molecule catalytic reactions, the short-pore structure of nano-zeolite can reduce the diffusion restriction of reactants and products, and inhibit the occurrence of "coking", and improve the activity and life of the zeolite catalyst. [0003] CN200910072747.7 introduces a method for preparing nano ZSM-5 molecular sieve. Pre-crystallized seed crystals are added to the gel system of template-free synthetic nano ZSM-5 molecular sieve, and then crystallized at 160-180°C for 24 hours , Cooling to room temperatu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/40B01J29/40B82Y30/00
CPCC01B39/40B01J29/40C01P2002/72C01P2004/03C01P2004/32C01P2004/62
Inventor 史静滕加伟赵国良徐建军
Owner CHINA PETROLEUM & CHEM CORP
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