Amidine modified mesoporous foam material used for carbon dioxide adsorption and preparation method of amidine modified mesoporous foam material

A technology of foam materials and carbon dioxide, applied in chemical instruments and methods, separation methods, alkali metal oxides/hydroxides, etc., can solve the problem of limited material use, unfavorable carbon dioxide desorption material regeneration cycle, and difficult to meet hydrothermal stability Requirements and other issues, to achieve the effect of simple synthesis, easy control and design

Inactive Publication Date: 2015-04-01
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The surface of the carbon dioxide adsorption material usually needs to have a certain amount of basicity. This kind of basicity should not be too strong. If it is too strong, it will not be conducive to the desorption of carbon dioxide and the regeneration cycle of the material; use at high temperature
[0007] At present, many researchers have modified mesoporous silicon-based materials with amino groups to increase the basic sites on the surface and improve the carbon dioxide adsorption capacity. Stability is difficult to meet the requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1 Preparation of mesoporous silica foam material

[0025] At room temperature, mix 8g P123 and 0.09g NH 4 F was dissolved in 28 mL of HCl with a concentration of 1.3 mol / L, and 49.93 mL of heptane and 16.75 mL of TEOS were added and mixed and stirred. After heating in a water bath at 52°C for 20 hours, the mixture was put into the reactor and heated at 100°C for 72 hours. Then the resulting mixture was cooled, filtered with suction, washed with water, and dried at 60° C. for 24 hours. Finally, the white solid was calcined at 550°C for 6 hours to remove the templating agent, and the Mesostructured Cellular Silica Foams (MCF) material was prepared.

Embodiment 2

[0026] Example 2 Preparation of PEI modified mesoporous silica foam material

[0027] A certain amount of PEI was dissolved in 10 mL of methanol and stirred magnetically for 30 minutes. Then a certain amount of MCF powder is added to the solution. Stir until the methanol evaporates, and dry it at 60°C for 12 hours to prepare PEI modified mesoporous silica foam with different PEI mass fractions (PEI mass / PEI+MCF mass).

[0028] In terms of carbon dioxide adsorption performance, the maximum adsorption capacity of this material is 3.24 mmol / g when the mass fraction of PEI is 70% at 85°C; the adsorption capacity at 30°C is 0.86 mmol / g when the mass fraction of PEI is 30%.

Embodiment 3

[0029] Example 3 Preparation of mixed amine modified mesoporous silica foam material

[0030] 0.5g PEI and 0.2g DETA were dissolved in 10mL of methanol and magnetically stirred for 30min, and then 0.3g of MCF powder prepared in Example 1 was added. Stir until the methanol is completely volatilized, and dry it at 60° C. for 12 hours to prepare a mixed amine-modified mesoporous silica foam material, which is labeled MCF(c) / PEI+DETA.

[0031] 0.5g PEI and 0.2g APTMS were dissolved in 10mL of methanol and magnetically stirred for 30min, and then 0.3g of MCF powder prepared in Example 1 was added. Stir until the methanol is completely evaporated, and dry it at 60°C for 12 hours to prepare a mixed amine-modified mesoporous silica foam material, which is labeled MCF(c) / PEI+APTMS.

[0032] For two different modified materials, the carbon dioxide adsorption capacity of mesoporous silica foam modified by mixed amine PEI / DETA and PEI / APTMS at 75°C is 2.99 mmol / g and 2.95 mmol / g, respectively; ...

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Abstract

The invention discloses an amidine modified mesoporous foam material used for carbon dioxide adsorption and a preparation method of the amidine modified mesoporous foam material and belongs to the technical field of carbon dioxide adsorption. The amidine modified mesoporous foam material is a PEI modified mesoporous silica foam material, a PEI and heptane modified mesoporous silica foam material or a mixed amine modified mesoporous silica foam material, wherein mixed amine is prepared from PEI and one of DETA and APTMS. The preparation method comprises the following steps: dissolving P123, NH4F, heptane and TEOS in a hydrochloric acid solution, carrying out heating reaction by virtue of a reaction kettle, carrying out air pump filtration, washing, drying and calcining to prepare a mesoporous foam material; and then putting the mesoporous foam material into the PEI and a solution of the PEI and the heptane or the mixed amine, and soaking to obtain the amidine modified mesoporous foam material. The amidine modified mesoporous foam material is high in carbon dioxide adsorption capability and simple in preparation method and provides a good carbon adsorption material for realizing a carbon capturing technology.

Description

Technical field [0001] The invention belongs to the technical field of carbon dioxide adsorption, and particularly relates to an amine-based modified mesoporous foam material for carbon dioxide adsorption and a preparation method thereof. Background technique [0002] At present, global warming is the greatest threat to the human environment. Global warming is not a simple environmental pollution and ecological disaster. It destroys the entire planet's climate system, triggers a series of chain reactions, and the consequences are irreversible. The "La Niña" phenomenon manifested in large areas of low temperature, rain, snow, and freezing disasters. Blizzards, floods, droughts and other phenomena in many parts of the world are related to the general background of global warming. Academic research believes that carbon dioxide, carbon dust generated by the combustion of coal, oil, and natural gas, and methane generated by dumping garbage are the main causes of global warming, and t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B01D53/02
CPCB01D53/02B01D2253/202B01D2253/34B01D2257/504B01J20/265B01J20/28045Y02C20/40
Inventor 刘启明马娟娟陈丹丹
Owner WUHAN UNIV
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