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Modified zifs material with high CO2 adsorption performance and preparation method thereof

An adsorption performance, CO2 technology, applied in separation methods, chemical instruments and methods, other chemical processes, etc., can solve the problems of restricting the effective diffusion of molecules, large adsorption opening pressure, etc., to achieve excellent adsorption performance, improve adsorption performance, and improve diffusion. The effect of restriction

Active Publication Date: 2019-06-11
TAIYUAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, although ZIF-8 has an effect on CO 2 Excellent selectivity, but narrow channels severely restrict CO 2 The effective diffusion of molecules, so that the CO 2 Adsorption opening pressure is high

Method used

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  • Modified zifs material with high CO2 adsorption performance and preparation method thereof
  • Modified zifs material with high CO2 adsorption performance and preparation method thereof
  • Modified zifs material with high CO2 adsorption performance and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 20.4 g (300 mmol) of imidazole and 12.0 g (300 mmol) of NaOH, add them into 20 mL of DMSO, protect with nitrogen, heat to 65°C under stirring, and reflux for 4 hours. Then slowly add 1,6-dibromohexane (100 mmol), after the reaction, remove the solvent DMSO by rotary evaporation, extract 3 times with chloroform, then wash 3 times with saturated brine, wash 3 times with water, concentrate by rotary evaporation, Dry in vacuo to give 1,6-bis(imidazol-1-yl)hexane.

[0021] Weigh 25mmol 2-methylimidazole and 1,6-bis(imidazol-1-yl)hexane (wherein, 2-methylimidazole and 1,6-bis(imidazol-1-yl)hexane molar ratio is 2 : 1), dissolved in 62.5 mL of anhydrous methanol, and then the above solution was placed in a hydrothermal synthesis kettle and kept at 50 °C for 2 h. Weigh 1.89 g of zinc nitrate hexahydrate and dissolve it in 62.5 mL of anhydrous methanol. The cooled former was slowly added dropwise to methanol solution of zinc nitrate, and vigorously stirred at room temper...

Embodiment 2-5

[0023] Same as Example 1, change 2-methylimidazole and 1,6-bis(imidazol-1-yl) hexane molar ratio x, obtain a series of ZIFs materials, marked as 6-x-ZIF-8, wherein x is respectively 5, 10, 15, 20.

Embodiment 6

[0025] Weigh 20.4 g (300 mmol) of imidazole and 12.0 g (300 mmol) of NaOH, add them into 20 mL of DMSO, protect with nitrogen, heat to 65°C under stirring, and reflux for 4 hours. Then slowly add 1,8-dibromooctane (100 mmol). After the reaction, the solvent DMSO was removed by rotary evaporation, extracted three times with chloroform, then washed three times with saturated brine and three times with water, and concentrated by rotary evaporation. Drying in vacuo gave 1,8-bis(imidazol-1-yl)octane.

[0026] Weigh 25mmol 2-methylimidazole and 1,8-bis(imidazol-1-yl) octane (wherein, 2-methylimidazole and 1,8-bis(imidazol-1-yl) octane molar ratio is 1 : 1) Dissolve in 62.5 mL of anhydrous methanol, and then place the above solution in a hydrothermal synthesis kettle and keep at 50°C for 2 h. Weigh 1.89 g of zinc nitrate hexahydrate and dissolve it in 62.5 mL of anhydrous methanol. The former was slowly added dropwise to methanol solution of zinc nitrate, and vigorously stirred at ...

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Abstract

The invention discloses a modified ZIFs (Zeolitic Imidazolate Frameworks) material with a high CO2 adsorption property and a preparation method of the modified ZIFs material. According to the preparation method, in the process of synthesizing ZIF-8, large-size second ligand (1,n-bi(imidazole-1-yl) alkyl, and n=6, 8, 10) is introduced to ream ZIF-8, so that on one hand, diffusion constraint of narrow pores and channels of ZIF-8 to CO2 molecules is effectively improved, on the other hand, a stable framework structure and a large specific surface area of the ZIF-8 can be maintained, and the CO2 adsorption property can be remarkably improved. The adsorbent designed and synthesized by the invention is excellent in adsorption property, the adsorption amount of CO2 under normal pressure can be up to 7.3 mmol / g at most, the adsorption amount of the material is far greater than that (1.9 mmol / g) of pure ZIF-8, efficient adsorption can be maintained at both low-temperature regions and high-temperature regions, and the adsorption property is at a leading level of adsorbents reported at present.

Description

technical field [0001] The invention relates to the field of adsorption material modification, specifically a high CO 2 Adsorption properties of modified zeolitic imidazolate framework materials (ZIFs), and a preparation method of the adsorbent. Background technique [0002] Global warming has become an environmental issue of great concern, with CO 2 The large amount of greenhouse gas emissions is the main reason for the aggravation of the greenhouse effect. CO 2 Capture and storage (CCS) remains the dominant technology for reducing CO2 emissions today. CO 2 The main emission of CCS still comes from the emission of industrial waste gas, and the direct capture and storage of carbon dioxide in the flue gas can greatly reduce the cost of CCS. However, due to the complex composition and high temperature of industrial waste gas, direct adsorption and capture of CO in flue gas 2 It has become a hot technology that needs to be developed urgently. [0003] Metal-organic frame...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/22B01D53/02B01J20/30
CPCB01D53/02B01D2257/504B01J20/226Y02C20/40
Inventor 史利娟李庆朝卢建军许少勃汤国辉
Owner TAIYUAN UNIV OF TECH
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