Method for synthesizing ZSM-5 zeolite with multilevel pore canals

A synthesis method, ZSM-5 technology, applied in chemical instruments and methods, crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problems of unsuitable catalytic materials and achieve rich content The effects of specific surface area, reduced production cost, and simple operation process

Active Publication Date: 2007-07-25
CHINA PETROLEUM & CHEM CORP +2
2 Cites 31 Cited by

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Problems solved by technology

However, considering that the pore wall of this material is in an ...
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Abstract

This invention discloses a method for synthesizing multi-level porous ZSM-5 zeolite. The method comprises: soaking monolithic silica gel column in sucrose solution, drying, polymerizing, carbonizing to obtain C-Si composite, wetting the C-Si composite with a mixed solution of Al source, inorganic alkali, organic amine and water, crystallizing, and recovering the product. The obtained ZSM-5 zeolite has multi-level pores, including micrometer-scale macropores, mesopores and micropores. The macropores can shorten the diffusion distances of reactive molecules, reduce the pressure decrease of the equipment, raise the unit processing capacity of the equipment, and make the adjustment and control of the product selectivity easier. The mesopores can provide large inner specific surface area, which is meaningful to the catalytic reaction of macromolecules.

Application Domain

Molecular sieve catalystsPentasil aluminosilicate zeolite

Technology Topic

Sucrose solutionChemistry +9

Image

  • Method for synthesizing ZSM-5 zeolite with multilevel pore canals
  • Method for synthesizing ZSM-5 zeolite with multilevel pore canals
  • Method for synthesizing ZSM-5 zeolite with multilevel pore canals

Examples

  • Experimental program(13)

Example Embodiment

[0032] Example 1
[0033] Stir 30ml of methyl orthosilicate, 6g of polyethylene glycol and 30ml of 0.01mol/L acetic acid solution evenly. After sealing, stir at 0°C for 50min. The obtained sol was poured into a polytetrafluoroethylene test tube or a glass tube, and aged in a water bath at 30°C for one day to obtain a wet silica gel column. Then soak the silica gel column with 0.01 mol/L ammonia water to prepare mesopores. Then soak the column with 0.1mol/L nitric acid solution, distilled water, 30% ethanol/water ethanol solution and Tween 80 for 6 hours, and finally dry and roast to obtain silica gel monolithic column B 1.

Example Embodiment

[0034] Example 2
[0035] According to the mass ratio, 1.25 sucrose: 0.14H 2 SO 4 : Make a solution with 5 water, put the silica gel monolithic column B1 into it and soak for 30 minutes, then dry at 100°C for 6 hours, 160°C for 6 hours, repeat the soaking, drying, and polymerization process once, and then carbonize at 900°C for 4 hours to obtain charcoal Silicon composite sample E1.

Example Embodiment

[0036] Example 3
[0037] Mix 0.038 g of sodium aluminate, 0.08 g of sodium hydroxide, 1 g of tetraethyl ammonium hydroxide solution and 2 g of water and stir evenly, then pour this solution into a reactor containing 1.3 g of carbon-silicon composite E1. Stir to make it fully wet, seal the reactor and crystallize at 150°C for 48 hours. After crystallization, it is cooled, filtered, washed, dried in an oven at 100-110°C for 3 to 4 hours, and then the resultant is burned in a muffle furnace at 600°C for 5 hours to obtain the product multi-channel ZSM-5 , Marked as A1.
[0038] The XRD spectrum of A1 is shown in Figure 1. As can be seen from Figure 1, all the figures have diffraction peaks at 2θ angles of 7.9°, 8.9°, 23.1°, 23.9°, and 24.4°. The diffraction peaks at these five places are The characteristic peaks of ZSM-5 indicate that the crystal form of the synthesized product in this example is ZSM-5.
[0039] The SEM image of A1 is shown in Figure 3. It can be seen from the figure that the synthesized product has macropores of 1 to 3 μm.
[0040] A1's N 2 The adsorption-desorption diagram is shown in Figure 4.
[0041] A stepwise diagram of the pore size of A1 is shown in Figure 5. It can be seen from the figure that the sample has mesopores with an average pore diameter of about 12.2 nm and micropores with 0.67 nm.
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PUM

PropertyMeasurementUnit
Average pore size0.67 ~ 12.2nm
tensileMPa
Particle sizePa
strength10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

  • The operation process is simple
  • Reduce manufacturing cost

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