Preparation method of nanorod particle ordered-assembly ZSM-5 zeolite molecular sieve

A technology of ZSM-5 and zeolite molecular sieve, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of environmental pollution and cost increase, and achieve no environmental pollution and low cost , the effect suitable for promotion and application

Inactive Publication Date: 2014-04-09
FUDAN UNIV
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  • Application Information

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Problems solved by technology

However, a large number of organic templates need to be added to the synthesis of multi-stage zeolite crystals with regular and uniform shapes, which will increase the cost and cause environmental pollution.
And only adding some inorganic salts, without other template assistance, using the seed crystal method to synthesize ZSM-5 zeolite with nano-rod-shaped particles in an orderly assembly, has not been reported so far.

Method used

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  • Preparation method of nanorod particle ordered-assembly ZSM-5 zeolite molecular sieve
  • Preparation method of nanorod particle ordered-assembly ZSM-5 zeolite molecular sieve
  • Preparation method of nanorod particle ordered-assembly ZSM-5 zeolite molecular sieve

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Embodiment 1

[0023] Prepare the initial gel in the following molar ratios: 1SiO 2 : 0.02Al 2 o 3 : 0.15Na 2 O : 0.40NaF : 65H 2 O, silica sol, aluminum sulfate, and sodium hydroxide were dissolved in deionized water respectively, and sodium chloride and 5 wt% of 200nm-sized MFI zeolite seed crystals were added under constant stirring. The above mixture was stirred and aged at room temperature for 2 hours, then put into a stainless steel static crystallization kettle with a polytetrafluoroethylene liner, and reacted at 120° C. for 48 hours. After crystallization, cool, filter and wash with deionized water for 3-4 times, and then dry the obtained sample at 80-120°C. The product is calcined in a muffle furnace or a tube furnace to remove the template agent, generally in an air atmosphere at 550 ° C for 4 to 6 hours.

Embodiment 2-5

[0025] The steps in this embodiment are exactly the same as those in Embodiment 1 above. The difference is that during the preparation of the reaction mixture, the NaF / Si 2 O changed from 0.40 to 0.30, 0.35, 0.45, 0.50.

Embodiment 6-8

[0027] The steps in this embodiment are exactly the same as those in Embodiment 1 above. The difference is that in the preparation process of the reaction mixture, the size of the seed crystals used is changed to 100nm, 400nm, and 600nm seeds.

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Abstract

The invention belongs to the technical field of inorganic materials, and particularly relates to a preparation method of a nanorod particle ordered-assembly ZSM-5 zeolite molecular sieve. By adopting a hydrothermal synthesis method, a silicon source, an aluminum source, an alkali source, a MFI zeolite crystal seed, an inorganic salt and a water phase are mixed and stirred into a gel mixture which is used as a raw material for synthesizing the ZSM-5 zeolite molecular sieve. The chemical composition of the MOR zeolite in such special structure is TO2:aY2O3:bM2 / nO, wherein T represents at least one quadrivalent element; Y represents at least one trivalent element, such as Al, B, Ga, Fe and the like; M represents at least one alkali metal or alkali earth metal element, and the valence state is n; a and b are respectively mole numbers of Y2O3 and M2 / nO; and a is 0-0.5, and b is 0-0.5. The method has the advantages of lower cost and no environmental pollution, and is suitable for popularization.

Description

technical field [0001] The invention belongs to the technical field of inorganic materials, and in particular relates to a preparation method of ZSM-5 zeolite in which nanorod-shaped particles are assembled in order. Background technique [0002] ZSM-5 zeolite is a microporous crystalline zeolite with a two-dimensional ten-membered ring channel structure. At the same time, ZSM-5 zeolite also has high thermal stability, hydrothermal stability and adjustable acidity. Therefore, ZSM-5 zeolite shows high performance in many reactions such as flow catalytic cracking (FCC), dewaxing isomerization, benzene / toluene / xylene conversion isomerization, aromatization, dehydration hydration, amination, oxidation, etc. practical value. [0003] The ZSM-5 zeolite currently used in industry is generally a micron-sized large-grained zeolite, and the particles are not uniform. When used for catalytic reactions, the diffusion resistance is large, the utilization rate of active sites is low, an...

Claims

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Application Information

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IPC IPC(8): C01B39/38
Inventor 唐颐张宏斌张红霞王磊吕新春王培丞张亚红
Owner FUDAN UNIV
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