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
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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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