Method for synthesizing micro-mesoporous composite molecular sieve based on multiple molecular sieves

A composite molecular sieve, molecular sieve technology, applied in chemical instruments and methods, alkali metal compounds, removal of gas pollutants, etc., can solve problems such as poor hydrothermal stability, poor absorption, and limited industrial applications.

Pending Publication Date: 2021-04-06
CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

People hope that mesoporous molecular sieves can be applied to the reaction of macromolecules, but there is a big difference between mesoporous molecular sieves and microporous molecular sieves in the molecular sieve skeleton. Compared with microporous molecular sieves, mesoporous molecular sieves do not have repeated single cells. The structural unit, whose internal structural unit is similar to an amorphous oxide, does not contain a crystalline structure region, and only has a local ordered structure. Therefore, the aluminum-containing mesoporous molecular sieve is similar to the amorphous aluminosilicate, and has weak and Medium-strength acidity, coupled with poor hydrothermal stability, and mesoporous molecular sieves have shape-selective catalytic oxidation absorption for macromolecules, but for small molecules, they do not have good absorption. Therefore, in large To some extent, it limits its industrial application in the field of adsorbents

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Add 4g of zeolite molecular sieve (silicon-alumina ratio is 40) into 60ml, 1mol / L sodium hydroxide solution and stir for 2.5h, then add 56g, 8.7wt% DTAB aqueous solution, stir at room temperature for 1h, place in a water bath for constant temperature Heating, water bath temperature 100°C, after 24 hours of crystallization time, cool the crystallization mother liquor to room temperature, and add 1mol / L hydrochloric acid to it to adjust the pH to 8, then continue to place it in a water bath for constant temperature crystallization, after 24 hours of crystallization time, at 550 The calcination was carried out at ℃ for 6 hours to obtain a micro-mesoporous composite molecular sieve sample.

[0034] According to XRD identification, it has the characteristic peak of mesoporous MCM-41 and the crystal phase structure of β zeolite molecular sieve. At the same time, the BET specific surface area can reach 550m 2 / g. It has been verified by fixed-bed adsorption experiments that t...

Embodiment 2

[0036] Add 4g of zeolite molecular sieve (silicon to aluminum ratio is 20) into 60ml, 1.5mol / L sodium hydroxide solution and stir for 2.5h, then add 56g, 8.7wt% CTAB aqueous solution, after stirring at room temperature for 1h, place in a water bath for Heating at constant temperature, water bath temperature 100°C, cooling the crystallization mother liquor to room temperature after 24 hours of crystallization time, and adding 1mol / L sulfuric acid to it to adjust the pH to 8, then continuing to crystallize at constant temperature in a water bath pot, after 24 hours of crystallization time Calcination was carried out at 550° C. for 6 hours to obtain a micro-mesoporous composite molecular sieve sample.

[0037] According to XRD identification, it has the characteristic peak of mesoporous MCM-41 and the crystal phase structure of β zeolite molecular sieve. At the same time, the BET specific surface area can reach 580m 2 / g. It has been verified by fixed-bed adsorption experiments t...

Embodiment 3

[0039] Add 4g of mordenite molecular sieve (silicon-aluminum ratio is 14) into 60ml, 1mol / L sodium hydroxide solution and stir for 2.5h, then add 56g, 8.7wt% TTAB aqueous solution, stir at room temperature for 1h, place in a water bath for Heating at constant temperature, water bath temperature 100°C, after 24 hours of crystallization time, cool the crystallization mother liquor to room temperature, and add 1mol / L perboric acid to it to adjust the pH to 8, then continue to place in a water bath for constant temperature crystallization, after 24 hours of crystallization time Calcination was carried out at 550° C. for 6 hours to obtain a micro-mesoporous composite molecular sieve sample.

[0040] According to XRD identification, it has the characteristic peak of mesoporous MCM-41 and the crystal phase structure of β zeolite molecular sieve. At the same time, the BET specific surface area can reach 60m 2 / g. It has been verified by fixed-bed adsorption experiments that the adsor...

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Abstract

The invention provides a method for synthesizing a micro-mesoporous composite molecular sieve based on multiple molecular sieves. The method comprises the following steps: synthesizing a mesoporous molecular sieve by using microporous molecular sieves, and regulating the pH value to control the reaction depth and regulate the pH value of the crystallization mother liquor by using amorphous silica-alumina among microporous molecular sieve unit cell particles and silica-alumina at the unit cell edge part as silica-alumina sources, so that the microporous structure is reserved, and the micro-mesoporous composite molecular sieve containing a large number of mesoporous structures is formed. According to the invention, the respective limitations of the microporous molecular sieve and the mesoporous molecular sieve are overcome, the molecular sieves with two pore diameters can be effectively and organically combined, so that the advantages of the two molecular sieves can be complemented, macromolecules have more pore channels in the adsorption process and can enter the molecular sieves, meanwhile, a large number of micropores provide adsorption active sites, and can be used for absorbing pollutants in blast furnace gas in the metallurgical or petrochemical industry, and thus the tail end flue gas treatment cost is reduced.

Description

technical field [0001] The invention relates to a micro-mesoporous composite molecular sieve, in particular to a method for synthesizing a micro-mesoporous composite molecular sieve based on various molecular sieves. Background technique [0002] As an effective porous material, microporous molecular sieves are widely used in petroleum smelting, fine chemical industry and adsorption separation. The representative material is zeolite molecular sieve. The outstanding feature of zeolite molecular sieve is that it can adjust the acidity and provide different The channel and internal hole travel shape-selective effect. This row selection effect can promote H 2 For the adsorption of S, according to the pseudo-first-order kinetics and pseudo-second-order kinetics models, there are two reaction paths for molecular sieves to adsorb pollutants in blast furnace gas, physical adsorption and chemical adsorption, and in these two reaction paths, physical adsorption Mainly rely on mesopo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/18B01J20/28B01J20/30C10K1/00C10K1/32
CPCB01J20/186B01J20/2808B01J20/28083C10K1/004C10K1/32
Inventor 胡鑫霍锐鹏罗海兵施飞夏龙刘昌持方定桥龚鹏
Owner CHINA CITY ENVIRONMENT PROTECTION ENGINEERING LIMITED COMPANY
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