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Method for modifying ZSM-5 zeolite material

A technology of ZSM-5 and treatment method, which is applied in the direction of crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., can solve the problem of reducing the catalytic activity of zeolite, low micropore surface area, and low mesopore specific surface area and other issues to achieve the effect of increasing the BET surface area

Active Publication Date: 2015-02-25
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there are still two obvious shortcomings in the prior art: one is that the mesopore specific surface area is still relatively low, the highest is CN1530322A, which is close to 250 m 2 / g; Second, when higher mesopores are obtained, the microporous crystal structure of ZSM-5 zeolite is severely damaged, and the micropore surface area is too low, which will seriously reduce the catalytic activity of zeolite

Method used

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  • Method for modifying ZSM-5 zeolite material
  • Method for modifying ZSM-5 zeolite material

Examples

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Effect test

Embodiment 1

[0031] Take 30 g of microporous ZSM-5 zeolite, 1200 mL of 0.60 mol / L KOH solution, and 75 mL of methanol and mix them thoroughly, then place them in a microwave digestion apparatus for 30 min, keep the temperature at 90 ° C; then filter and wash. Put the washed ZSM-5 zeolite in a beaker, add 900mL of 0.2mol / L nitric acid solution, stir at room temperature for 20min, transfer to a water bath at 90°C for 2h, filter and wash, then place in an oven for 110 ℃ drying for 12h, the obtained sample number is CL1.

Embodiment 2

[0033] Take 30 g of microporous ZSM-5 zeolite, 1200 mL of 0.50 mol / L KOH solution, and 90 mL of ethanol and mix well, then place it in a microwave digestion apparatus for 20 minutes, keep the temperature at 100 °C; then filter and wash. Put the washed ZSM-5 zeolite in a beaker, add 900mL of 0.2mol / L nitric acid solution, stir at room temperature for 20min, transfer to a water bath at 80°C for 2h, filter, wash, and place in an oven at 110°C After drying for 12 hours, the obtained sample number is CL2.

Embodiment 3

[0035] Take 30 g of microporous ZSM-5 zeolite, 2100 mL of 0.50 mol / L NaOH solution, and 150 mL of propanol and mix them thoroughly, then place them in a microwave digestion apparatus for 30 minutes, and keep the temperature at 70 ° C; then filter and wash. Put the washed ZSM-5 zeolite in a beaker, add 1500mL of 0.8mol / L sulfuric acid solution, stir at room temperature for 20min, transfer to a water bath at 70°C for 2h, filter, wash, and place in an oven at 110°C After drying for 12 hours, the obtained sample number is CL3.

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Abstract

The invention discloses a method for modifying a ZSM-5 zeolite material. The method comprises the following steps of: mixing an alkaline solution, an organic solvent and ZSM-5 zeolite in a certain ratio, and performing microwave treatment; and performing acid treatment, separating, washing and drying to obtain the mesopore-micropore ZSM-5 zeolite. By the method, the ZSM-5 zeolite is subjected to microwave treatment in the existence of the organic solvent and the alkaline solution, so that formation of mesopores can be promoted, and micropores are efficiently converted into the mesopores and can be stabilized and protected; amorphous aluminum in a pore channel of a zeolite crystal can be eluted in the subsequent acid treatment process, so that aims of dredging the pore channel and increasing the total specific surface area are fulfilled; and the relatively complete micropores can be reserved in the ZSM-5 zeolite, a plurality of mesopores are provided, and simultaneously, the total Brunauer, Emmett and Teller (BET) specific surface area can be increased.

Description

technical field [0001] The invention relates to a zeolite modification method, which belongs to the field of molecular sieve synthesis modification, in particular to a post-treatment modification method of ZSM-5 zeolite material. Background technique [0002] ZSM-5 zeolite is widely used in the petroleum industry because of its regular microporous structure, suitable acidity, good thermal stability and hydrothermal stability. ZSM-5 zeolite has two intersecting pore systems with pore diameters of 5.1×5.5 nm and 5.3×5.6 nm, which is a typical microporous structure. Microporous ZSM-5 zeolite, in the reaction involving macromolecules, its narrow channels (less than 2nm) can easily cause the mass transfer and diffusion resistance of the reaction materials to be too large, and it is extremely difficult for macromolecular reactants to enter the crystal pores for reaction, so that The catalytic performance of zeolite cannot be fully utilized; and it is also difficult for macromolec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/38
Inventor 范峰凌凤香王少军杨春雁
Owner CHINA PETROLEUM & CHEM CORP
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