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Mesoporous silicon-aluminum molecular sieve adsorbent for VOCs (volatile organic chemicals) treatment and preparation method thereof

A mesoporous silica-alumina and adsorbent technology, which is applied in separation methods, gas treatment, chemical instruments and methods, etc., can solve the problems of activated carbon adsorption performance that has a great influence, does not meet safety production requirements, and is prone to fire. Good strength, large pore volume, easy regeneration and reuse effect

Inactive Publication Date: 2017-08-18
JIANGSU WISDOM ENG TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical industrial applications, VOCs waste gas usually contains water vapor, and the adsorption performance of activated carbon is greatly affected by water vapor, which makes regeneration difficult and easy to cause secondary pollution, especially in the process of regeneration of hot air after adsorption saturation, which is prone to fire. Comply with today's safety production requirements

Method used

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  • Mesoporous silicon-aluminum molecular sieve adsorbent for VOCs (volatile organic chemicals) treatment and preparation method thereof
  • Mesoporous silicon-aluminum molecular sieve adsorbent for VOCs (volatile organic chemicals) treatment and preparation method thereof
  • Mesoporous silicon-aluminum molecular sieve adsorbent for VOCs (volatile organic chemicals) treatment and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] This example is a method for preparing a mesoporous silica-alumina molecular sieve adsorbent for VOCs treatment, comprising the following steps:

[0018] (1) Add 0.39g of aluminum isopropoxide and 0.194g of ferric nitrate to 20mL of ethanol containing 0.2mL of acetylacetone (acac), stir well, and reflux the obtained mixture for 1h;

[0019] (2) Add 10.7 mL of tetraethyl silicate to the mixed solution of step (1);

[0020] (3) Prepare a mixed solution of 8.75gCTAB (cetyltrimethylammonium bromide), 10mL ammonia, and 120mL water;

[0021] (4) Add the mixed solution made in step (2) dropwise to the mixed solution in step (3) in stirring to form a sol; its molar ratio components are: silicon oxide (SiO 2 ): cetyltrimethylammonium bromide (CTAB): water (H 2 O): Ammonia (NH 3 ·H 2 O): aluminum isopropoxide (Al(OPri) 3 ): Iron nitrate (Fe(NO 3 ) 3 ):acetylacetone (acac)=1:0.5:130:2.5:0.04:0.01:1.

[0022] (5) Keep the pH value of the generated sol at 10.5, stir at room ...

Embodiment 2

[0027] This example is a method for preparing a mesoporous silica-alumina molecular sieve adsorbent for VOCs treatment, comprising the following steps:

[0028] (1) Add 0.39g of aluminum isopropoxide and 0.29g of ferric nitrate to 20mL of isopropanol solution containing 0.4mL of acetylacetone (acac), stir well, and reflux the obtained mixture for 1.5h;

[0029] (2) Add 10 mL of tetraethyl silicate to the mixed solution of step (1);

[0030] (3) Prepare a mixed solution of 8.9gCTAB (cetyltrimethylammonium bromide), 10mL ammonia, and 150mL water;

[0031] (4) Add the mixed solution made in step (2) dropwise to the mixed solution in step (3) in stirring to form a sol; its molar ratio components are: silicon oxide (SiO ): hexadecyl trimethyl Ammonium bromide (CTAB): water (H2O): ammonia water (NH3 H2O): aluminum isopropoxide (Al(OPri)3): iron nitrate (Fe(NO3)3): acetylacetone (acac) = 0.93: 0.5:130:2.5:0.043:0.02:0.8.

[0032] (5) Keep the pH value of the generated sol at 10, sti...

Embodiment 3

[0037] This example is a method for preparing a mesoporous silica-alumina molecular sieve adsorbent for VOCs treatment, comprising the following steps:

[0038] (1) Add 0.39g of aluminum isopropoxide and 0.388g of ferric nitrate to 40mL of isopropanol solution containing 0.8mL of acetylacetone (acac), stir well, and reflux the obtained mixture for 1h;

[0039] (2) Add 10.5 mL of tetraethyl silicate to the mixed solution of step (1);

[0040] (3) Prepare a mixed solution of 8.7gCTAB (cetyltrimethylammonium bromide), 10mL ammonia, and 120mL water;

[0041] (4) Add the mixed solution made in step (2) dropwise to the mixed solution in step (3) in stirring to form a sol; its molar ratio components are: silicon oxide (SiO ): hexadecyl trimethyl Ammonium bromide (CTAB): water (H2O): ammonia water (NH3 H2O): aluminum isopropoxide (Al(OPri)3): iron nitrate (Fe(NO3)3): acetylacetone (acac) = 0.98: 0.5:160:2.5:0.04:0.015:0.4.

[0042] (5) Keep the pH value of the generated sol at 10, ...

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Abstract

The invention discloses a preparation method of a mesoporous silicon-aluminum molecular sieve adsorbent for VOCs (volatile organic chemicals) treatment. Doping modification is performed by taking acetylacetone as a chelating agent, iron nitrate as an iron source and aluminum isopropoxide as an aluminum source; a synthesis route of synthesizing a mesoporous silicon-aluminum molecular sieve by a sol-gel method is adopted. The mesoporous silicon-aluminum molecular sieve provided by the invention is particularly suitable for an adsorbent for VOCs treatment, and has the advantages of large specific surface area, large pore volume, high adsorption selectivity, high mechanical strength, stable chemical properties, wide source and easy regeneration and reutilization.

Description

technical field [0001] The invention relates to a mesoporous silica-alumina molecular sieve adsorbent for VOCs treatment and a preparation method thereof, specifically an adsorbent for modifying a mesoporous silica-alumina molecular sieve by doping Fe elements and a preparation method thereof, especially suitable for An adsorbent used in a VOCs treatment adsorption device and a preparation method thereof belong to the technical field of environmental protection and energy saving. Background technique [0002] Volatile Organic Compounds (VOCs) are referred to as VOCs (Volatile Organic Compounds), which refer to organic compounds with a saturated vapor pressure greater than 70Pa at normal temperature and a boiling point within 260°C at normal pressure, mainly including aliphatic hydrocarbons, aromatic hydrocarbons, halogenated hydrocarbons, alcohols, and aldehydes. , ketones, ethers, esters, etc., mainly from petrochemical, coating, drug synthesis, rubber and other production ...

Claims

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Application Information

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IPC IPC(8): C01B39/06B01J20/18B01D53/02B01J20/30
CPCB01D53/02B01D2257/708B01J20/183C01B39/065C01P2002/54C01P2006/12C01P2006/14C01P2006/17Y02A50/20
Inventor 李来所周兵
Owner JIANGSU WISDOM ENG TECH
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