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Alumina-based trapping material capable of efficiently adsorbing carbon dioxide as well as preparation method and application of alumina-based trapping material

A carbon dioxide-adsorbing, alumina-based technology, applied in the fields of alkali metal oxides/hydroxides, chemical instruments and methods, separation methods, etc., can solve the problems of strong corrosion of equipment, easy degradation and volatilization of solvents, and high regeneration energy consumption. Achieve reasonable component distribution ratio, increase adsorption capacity, and simple preparation process

Pending Publication Date: 2022-07-29
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this process has some inherent defects, including the solvent is easy to degrade and volatilize, the regeneration energy consumption is high, and the equipment is highly corrosive.

Method used

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  • Alumina-based trapping material capable of efficiently adsorbing carbon dioxide as well as preparation method and application of alumina-based trapping material
  • Alumina-based trapping material capable of efficiently adsorbing carbon dioxide as well as preparation method and application of alumina-based trapping material

Examples

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Effect test

Embodiment 1

[0028] An alumina-based capture material for efficiently adsorbing carbon dioxide, the preparation method of which is as follows:

[0029] 1) Dissolve 8g of aluminum chloride hexahydrate, 4g of urea, and 1.35g of magnesium chloride hexahydrate in 80ml of water, stir for about 2h, and place it in an oven at 90°C after dissolving, and form a white gel after 48h;

[0030] 2) The residual ions on the gel are removed by pyridine washing treatment, and then the gel is dried by supercritical fluid drying method (the drying medium is ethanol, the temperature is 245-285°C, the pressure is 6.5-9.5Mpa, and the time is 3-4h) , to obtain aerogels with porous structure;

[0031] 3) After calcining the aerogel at 550 °C for 4 h, a porous magnesia / alumina-based capture material capable of efficiently adsorbing carbon dioxide was obtained.

[0032] Depend on figure 1 As shown, the capture material provided in the present invention has a multi-level pore structure, and the small pores in the ...

Embodiment 2

[0035] An alumina-based capture material for efficiently adsorbing carbon dioxide, the preparation method of which is as follows:

[0036] 1) Dissolve 12.5g of aluminum nitrate nonahydrate, 4g of urea, and 0.80g of magnesium sulfate in 80ml of water, stir for about 2h, put it in an oven at 70°C after dissolving, and form a white gel after 96h;

[0037] 2) The residual ions on the gel are removed by pyridine washing treatment, and then the gel is dried by supercritical fluid drying method (the drying medium is ethanol, the temperature is 245-285°C, the pressure is 6.5-9.5Mpa, and the time is 3-4h) , to obtain aerogels with porous structure;

[0038] 3) After calcining the aerogel at 550 °C for 6 h, a porous magnesia / alumina-based capture material capable of efficiently adsorbing carbon dioxide was obtained.

[0039] Tests show that the BET specific surface area of ​​the capture material is 417.59m 2 / g, the average pore size is 13.51 nm.

Embodiment 3

[0041] An alumina-based capture material for efficiently adsorbing carbon dioxide, the preparation method of which is as follows:

[0042] 1) Dissolve 8g of aluminum chloride hexahydrate, 4g of urea, and 0.74g of anhydrous calcium chloride in 80ml of water, stir for about 2h, put it in an oven at 70°C after dissolving, and form a white gel after 96h;

[0043] 2) The residual ions on the gel are removed by pyridine washing treatment, and then the gel is dried by supercritical fluid drying method (the drying medium is ethanol, the temperature is 245-285°C, the pressure is 6.5-9.5Mpa, and the time is 3-4h) , to obtain aerogels with porous structure;

[0044] 3) After calcining the aerogel at 650 °C for 2 h, a porous magnesia / alumina-based capture material capable of efficiently adsorbing carbon dioxide was obtained.

[0045] Tests show that the BET specific surface area of ​​the capture material is 439.17m 2 / g, the average pore size is 13.21 nm.

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Abstract

The invention relates to an alumina-based trapping material capable of efficiently adsorbing carbon dioxide as well as a preparation method and application of the alumina-based trapping material. A chemical adsorption component of the trapping material is magnesium oxide / calcium oxide, and a carrier is alumina with a high specific surface area. The preparation method comprises the following steps: preparing the porous alumina-based material by using a sol-gel method, dissolving an aluminum salt, an auxiliary agent and a magnesium salt / calcium salt in a molar ratio of 1: 2: (0.1-0.5) in a cosolvent of water and tert-butyl alcohol, stirring and dissolving, placing in a drying oven at a certain temperature, and forming gel after a certain time. The gel is subjected to washing, drying, high-temperature roasting and the like to obtain the trapping material capable of efficiently adsorbing CO2. The method has the advantages that the used raw materials are low in cost and easy to obtain, the preparation process is simple, and meanwhile, carbon dioxide can be efficiently captured under normal pressure.

Description

technical field [0001] The invention relates to the field of carbon dioxide capture by solid adsorbents, in particular to an alumina-based capture material capable of efficiently adsorbing carbon dioxide and a preparation method and application thereof. Background technique [0002] Carbon dioxide is a typical greenhouse gas in the atmosphere, which causes serious global warming, climate change and other related environmental problems. Since the beginning of the Industrial Revolution, with the large-scale burning of fossil fuels, the concentration of carbon dioxide in the atmosphere has increased dramatically in less than 260 years from about 280 ppm before industrialization to about 400 ppm now. In the absence of fundamental changes in the energy level, carbon capture and storage (CCS) technology with great environmental and social significance has become the focus of scholars from all over the world. [0003] Various materials and technologies have been developed to captu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/08B01J20/28B01D53/02B01J13/00
CPCB01J20/08B01J20/28047B01J20/28057B01J20/28061B01D53/02B01J20/28083B01J13/0056B01J13/0065B01J13/0091B01D2257/504
Inventor 吴仲岿孙其勋王梦婷
Owner WUHAN UNIV OF TECH
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