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A kind of method of Y-type molecular sieve hydrophobic modification

A hydrophobic modification and molecular sieve technology, which is applied in the directions of crystalline aluminosilicate zeolite, fajhedral crystalline aluminosilicate zeolite, etc., can solve the problems of poor effect and complicated hydrophobic modification method of Y-type molecular sieve, and achieves the technical solution and Clear effect, avoid handling problems, high crystallinity effect

Active Publication Date: 2021-07-20
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] In view of the above-mentioned deficiencies in the prior art, the purpose of the present invention is to provide a method for hydrophobic modification of Y-type molecular sieves, aiming at solving the problem that the method for hydrophobic modification of Y-type molecular sieves is complicated and the effect is not good

Method used

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  • A kind of method of Y-type molecular sieve hydrophobic modification

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Effect test

Embodiment 1

[0031] NaY molecular sieve raw material (Nankai Catalyst Factory, SAR=5.6) is made into 100-200 mesh particles, placed in a quartz reaction tube, under 100ml / min nitrogen flow, the reaction time is 2h at 450°C, and the adsorption water and Bound water; pass nitrogen flow containing trimethylchlorosilane to react with Y-type molecular sieve after high temperature activation, space velocity 250h -1 , the reaction temperature is 350°C, and the reaction time is 4h; cut off the feeding of the nitrogen flow of the coupling agent, and instead feed oxygen into the silanized Y-type molecular sieve with a space velocity of 100h -1 , the reaction temperature is 550° C., and the reaction time is 4 hours; then the oxidized granular product is washed and dried with ethanol and deionized water to obtain a hydrophobic zeolite molecular sieve. The unhydrophobized sample was recorded as NaY-1, and the hydrophobized sample was recorded as SNaY-1. The properties are listed in Table 1.

Embodiment 2

[0033]HY molecular sieves (Huaxin Catalyst Factory, SAR=40) were made into 100-200 mesh particles, placed in a quartz reaction tube, and the reaction time was 2h under 100ml / min nitrogen flow, 550°C, and dried to remove adsorbed water and Bound water; pass through a nitrogen flow containing methyltrimethoxysilane to react with Y-type molecular sieve activated at high temperature, and the space velocity is 200h -1 , the reaction temperature is 250°C, and the reaction time is 2h; cut off the nitrogen flow of the coupling agent, and change to feed oxygen into the silanized Y-type molecular sieve, with a space velocity of 80h -1 , the reaction temperature is 600° C., and the reaction time is 2 hours; then the oxidized granular product is washed and dried with ethanol and deionized water to obtain a hydrophobic zeolite molecular sieve. The unhydrophobized sample is marked as HY-1, and the hydrophobized sample is marked as SHY-1. The properties are listed in Table 1.

Embodiment 3

[0035] Hydrophobic Y molecular sieves were prepared according to the method in Example 1. The Y-type molecular sieve used is USY, the unhydrophobized sample is marked as USY-1 (Nankai Catalyst Factory, SAR=5.6), and the hydrophobized sample is marked as SUSY-1, and the properties are listed in Table 1.

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Abstract

The invention discloses a method for hydrophobically modifying Y-type molecular sieves, which belongs to the technical field of microporous materials. In the present invention, Y-type molecular sieve is used as a raw material. In a fixed-bed reactor, high-temperature activation is first performed, and then silanization reaction is performed in a nitrogen flow containing a coupling agent for 0.5-4 hours, and then oxygen is introduced into the reactor for silicon coating. Modified to obtain hydrophobic Y-type molecular sieve. This method is applicable to various Y-type molecular sieves, and the pore structure of the modified molecular sieve does not change much, and still maintains its good pore properties. This method is simple and easy, and is suitable for preparing microporous hydrophobic zeolite materials.

Description

technical field [0001] The invention belongs to the technical field of microporous materials, and in particular relates to a preparation method of a highly hydrophobic zeolite material. The material has broad application prospects in organic pollution removal, adsorption separation and catalysis. [0002] technical background [0003] In recent years, with the rapid development of the economy, a large amount of industrial organic waste gas has been discharged, which has degraded the quality of the atmospheric environment, and it is necessary to increase the treatment of organic waste gas. At present, the methods widely used to control organic waste gas mainly include thermal destruction method, biodegradation method, catalytic combustion method and adsorption method, among which adsorption method is mainly used in the treatment of low concentration and high flux volatile organic compounds. As an efficient adsorption material, molecular sieves are widely used in the treatment...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/24
CPCC01B39/24
Inventor 张傑高君安李英霞
Owner BEIJING UNIV OF CHEM TECH
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