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Preparation method of organic amine modified layered double hydroxide/SBA-15 composite material as CO2 adsorbent and application thereof

A technology of double hydroxide and composite material, applied in the directions of alkali metal oxide/hydroxide, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of high equipment corrosion rate, secondary pollution, high cost, etc.

Pending Publication Date: 2021-11-26
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Although almost all the carbon capture technologies that have been industrialized at present are based on the chemical absorption method using liquid alkaline solutions such as alcohol amines and organic amine solutions, and it has achieved good results after continuous improvement and perfection, but there are still relatively few There are problems such as high cost, high equipment corrosion rate, and secondary pollution caused by solvent volatilization

Method used

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  • Preparation method of organic amine modified layered double hydroxide/SBA-15 composite material as CO2 adsorbent and application thereof
  • Preparation method of organic amine modified layered double hydroxide/SBA-15 composite material as CO2 adsorbent and application thereof
  • Preparation method of organic amine modified layered double hydroxide/SBA-15 composite material as CO2 adsorbent and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Dissolve a certain amount of SBA-15 (2g) in 100ml of deionized water, and stir at room temperature for 0.5h to obtain a uniformly dispersed SBA-15 suspension. 0.036mol / L of Mg(NO 3 ) 2 ·6H 2 O and 0.012mol / L Al(NO 3 ) 3 9H 2 O is prepared in 50ml mixed liquid, added to the above suspension, and then added a certain amount of 0.6mol / L Na 2 CO 3 and 1.2mol / L NaOH mixed solution to adjust pH=10±0.1. The above mixture was stirred in a water bath at 50° C. for 8 h, then filtered and washed to pH = 7, and dried in an oven at 80° C. to obtain LDH / SBA-15. Dissolve 0.01g PEI in 2ml ethanol, then add 1g of the above LDH / SBA-15, stir the above suspension for 2h, transfer it to 60°C for vacuum drying. The obtained sample is called 1PEI / 20LDH-SBA-15, where 20 is the mass percent of LDH loading in the composite and 1 is the mass percent of PEI loading in the composite.

[0016] (2) Place the above-mentioned certain amount of adsorbent (10mg) in the thermogravimetric inst...

Embodiment 2

[0018] (1) Dissolve a certain amount of SBA-15 (1.5g) in 100ml of deionized water and stir at room temperature for 1 hour to obtain a uniformly dispersed SBA-15 suspension. 0.036mol / L of Mg(NO 3 ) 2 ·6H 2 O and 0.012mol / L Al(NO 3 ) 3 9H 2 O is prepared in 100ml mixed solution, added to the above suspension, and then added a certain amount of 1.2mol / L Na 2 CO3 and 2mol / L NaOH mixed solution to adjust pH=10±0.1. The above mixture was stirred in a water bath at 60° C. for 10 h, then filtered and washed to pH = 7, and dried in an oven at 100° C. to obtain LDH / SBA-15. 0.04g PEI was dissolved in 3ml ethanol, then 2g of the above LDH / SBA-15 was added, the above suspension was stirred for 4h, and then transferred to 60°C for vacuum drying. The obtained sample is called 2PEI / 30LDH-SBA-15, where 40 is the mass percent of LDH loading in the composite and 2 is the mass percent of PEI loading in the composite.

[0019] (2) Place the above-mentioned certain amount of adsorbent (10mg...

Embodiment 3

[0021] (1) Dissolve a certain amount of SBA-15 (1.5g) in 100ml of deionized water and stir at room temperature for 2 hours to obtain a uniformly dispersed SBA-15 suspension. 0.036mol / L of Mg(NO 3 ) 2 ·6H 2 O and 0.012mol / L Al(NO 3 ) 3 9H 2 O is prepared in 50-200ml mixed solution, added to the above suspension, and then added a certain amount of 1.5mol / L Na 2 CO 3 and 3mol / L NaOH mixed solution to adjust pH=10±0.1. The above mixture was stirred in a water bath at 60° C. for 10 h, then filtered and washed to pH = 7, and dried in an oven at 100° C. to obtain LDH / SBA-15. Dissolve 0.04g PEI in 2-10ml ethanol, then add 2g of the above LDH / SBA-15, stir the above suspension for 5h, transfer it to 60°C for vacuum drying. The obtained sample is called 2PEI / 40LDH-SBA-15, where 40 is the mass percent of LDH loading in the composite and 2 is the mass percent of PEI loading in the composite.

[0022] (2) Place the above-mentioned certain amount of adsorbent (10mg) in the thermogra...

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Abstract

The invention provides a preparation method of an organic amine modified layered double hydroxide / SBA-15 composite material as a CO2 adsorbent and an application thereof. The preparation method comprises the following steps: depositing layered double hydroxide (LDH) on SBA-15 by using an in-situ method to form an LDH / SBA-15 composite material, and loading polyethyleneimine (PEI) on the composite material by using an impregnation method to obtain the organic amine modified layered double hydroxide / SBA-15 (PEI / LDH-SBA-15) composite material as the low-temperature CO2 adsorbent. According to the present invention, in the wide temperature range (25-200 DEG C), the adsorbent has high adsorption capacity on the mixed gas of CO2 (the concentration is 5-25 vol.%) and N2 (the concentration is 75-95 vol.%), and the adsorbent has characteristics of high specific surface area and good thermal stability.

Description

technical field [0001] The invention relates to a method for preparing an organic amine-modified layered double hydroxide / SBA-15 composite adsorbent for adsorbing carbon dioxide and its ability to adsorb CO under low temperature conditions 2 Applications. Background technique [0002] Due to atmospheric CO 2 Concentrations continue to rise, which has brought about disastrous consequences in terms of climate, environment and ecology, and will have long-term effects, thus stimulating more and more people's interest in carbon emission reduction technology research. Today, my country's CO 2 The emission sources of China still mainly come from the use of fossil energy, although renewable energy technologies such as solar energy, tidal energy, water energy, and wind energy have received enough attention and have been significantly improved. However, within a few decades or even longer, the rapid growth of my country's industry and the rapid development of the economy cannot be ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/22B01J20/28B01J20/30B01D53/02B01D53/62B01D53/81
CPCB01J20/041B01J20/18B01J20/22B01J20/28061B01J20/28064B01D53/02B01D53/62B01D53/81B01D2257/504Y02A50/20Y02C20/40
Inventor 叶青吴凯王兰洋孟繁伟
Owner BEIJING UNIV OF TECH
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