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A kind of high-performance mesomicro double-porous controllable molecular sieve adsorbent and its preparation and application

A high-performance, molecular sieve technology, applied in other chemical processes, chemical instruments and methods, silicates, etc., can solve the problems of VOCs adsorption decrease, limited activated carbon adsorption performance, unfavorable industrial application, etc., achieve good application prospects, shorten Synthesis time, the effect of short synthesis time

Active Publication Date: 2018-05-29
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Activated carbon is currently the most widely used adsorbent, but its flammability limits the adsorption performance of activated carbon under high temperature conditions; silica gel has a high adsorption capacity for VOCs under dry conditions, but due to its hydrophilic nature, it is difficult Under industrial conditions, the adsorption capacity of VOCs is greatly reduced
Patent 201110006599.6 discloses an organic resin with super adsorption properties for organic matter, but the nature of the organic matter is limited, and this adsorbent can only be used at lower temperatures; patent 01126842.5 utilizes the properties of diatomaceous earth with high porosity and high specific surface area A fly ash-based adsorbent was synthesized. Although it has a certain adsorption capacity for VOCs, the synthesis time is long and the energy consumption is high, which is not conducive to industrial application.

Method used

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  • A kind of high-performance mesomicro double-porous controllable molecular sieve adsorbent and its preparation and application
  • A kind of high-performance mesomicro double-porous controllable molecular sieve adsorbent and its preparation and application
  • A kind of high-performance mesomicro double-porous controllable molecular sieve adsorbent and its preparation and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Follow the steps below to prepare a high-performance meso-micro double-porous controllable molecular sieve adsorbent:

[0040] (1) Add 8.12g of tetrapropylammonium hydroxide (TPAOH, 25% aqueous solution) into 20mL of distilled water, stir at room temperature until evenly mixed, then add 0.102g of aluminum isopropoxide, stir until aluminum isopropoxide is completely hydrolyzed; weigh Tetraethyl orthosilicate 10.4g was added dropwise to the above solution under stirring at 750r / min to obtain liquid A;

[0041] (2) Dissolve 1.5g of sodium tetradecylsulfonate into 16mL of distilled water, stir in a water bath at 40°C, and after 1 hour, add 0.3g of 3-chloropropyltriethoxysilane to the solution to obtain liquid B;

[0042] (3) Quickly add liquid B prepared in step (2) to liquid A prepared in step (1), adjust pH=9.7, and stir for 2 hours to obtain mother liquor;

[0043] (4) Transfer the mother liquor prepared in step (3) into a 100mL polytetrafluoroethylene reactor, and conduc...

Embodiment 2

[0045] Follow the steps below to prepare a high-performance meso-micro double-porous controllable molecular sieve adsorbent:

[0046] (1) Add 8.12g of tetrapropylammonium hydroxide (TPAOH, 25% aqueous solution) into 20mL of distilled water, stir at room temperature until evenly mixed, then add 0.204g of aluminum isopropoxide, and stir until the aluminum isopropoxide is completely hydrolyzed. Weigh 10.4 g of tetraethyl orthosilicate, and drop into the above solution drop by drop under stirring at 750r / min to obtain liquid A;

[0047] (2) Dissolve 3.28g of sodium n-hexadecylsulfonate into 16mL of distilled water, stir in a water bath at 40°C, and after 1 hour, add 1.1g of 3-aminopropyltriethoxysilane to the solution to obtain liquid B;

[0048] (3) Quickly add liquid B prepared in step (2) to liquid A prepared in step (1), adjust pH=8.8, stir for 2 hours,

[0049] (4) Transfer the mixed solution into a 100mL polytetrafluoroethylene reaction kettle, and conduct a hydrothermal re...

Embodiment 3

[0051] Follow the steps below to prepare a high-performance meso-micro double-porous controllable molecular sieve adsorbent:

[0052] (1) Add 8.12g of tetrapropylammonium hydroxide (TPAOH, 25% aqueous solution) into 20mL of distilled water, stir at room temperature until evenly mixed, then add 0.408g of aluminum isopropoxide, stir until aluminum isopropoxide is completely hydrolyzed; weigh Tetraethyl orthosilicate 10.4g was added dropwise to the above solution under stirring at 750r / min to obtain liquid A;

[0053] (2) Dissolve 3.48g of sodium dodecylbenzenesulfonate into 16mL of distilled water, stir in a water bath at 40°C, and after 1 hour, add 0.55g of 3-aminopropyltriethoxysilane to the solution to obtain liquid B;

[0054] (3) Quickly add liquid B prepared in step (2) into liquid A prepared in step (1), adjust pH=9.7, stir for 2 hours,

[0055] (4) Transfer the mixed solution into a 100mL polytetrafluoroethylene reactor, and conduct a hydrothermal reaction at 140°C for ...

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Abstract

The invention belongs to the technical field of air pollution control, and in particular relates to a high-performance mesomicro double-pore controllable molecular sieve adsorbent and its preparation and application. The preparation method comprises the following steps: using silicon source, aluminum source, microporous structure directing agent, mesoporous template agent, organosilane and water as raw materials to synthesize a mother liquor, the mother liquor utilizes microwave-assisted hydrothermal reaction, centrifuges the reaction product, drying and calcining to obtain the high-performance mesomicro double-pore controllable molecular sieve adsorbent. The invention uses an efficient method to prepare the mesoporous zeolite molecular sieve with high specific surface area, high pore volume and high adsorption performance, which greatly shortens the synthesis time and simplifies the synthesis process. The zeolite-type molecular sieve adsorbent synthesized by the present invention has a multi-level pore structure, adjustable pore size, low mass transfer resistance, high adsorption performance for VOCs, and high hydrophobicity and hydrothermal stability, and has a high level in the technical field of VOCs treatment. application value.

Description

technical field [0001] The invention belongs to the technical field of air pollution control, and in particular relates to a high-performance mesomicro double-pore controllable molecular sieve adsorbent and its preparation and application. Background technique [0002] Volatile Organic Compounds (Volatile Organic Compounds, VOCs) refer to organic compounds whose saturated vapor pressure is greater than 70Pa at normal temperature and whose boiling point is within 260°C at normal pressure. VOCs are a common air pollutant, mainly from printing, painting, pharmaceutical, furniture manufacturing and petrochemical industries. Most of these organic waste gases are flammable and explosive, and are often accompanied by peculiar smell and stench in the air. At low solubility, they can irritate human eyes, nose, and respiratory system, and even induce human cancer and mutation. [0003] With the enhancement of people's awareness of environmental protection, the emission standards of a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/16B01J20/28B01J20/30C01B39/04
Inventor 陈志航戴际强岑超平陈定盛曾盖钟佩怡
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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