Metal organic framework material used for absorbing and separating CO2 and preparation method thereof

A metal-organic framework and CO2 technology, which is applied in the field of modification of porous metal framework materials, can solve the problems of poor selectivity and achieve the effects of increased adsorption performance, strong adsorption capacity, and enhanced interaction

Inactive Publication Date: 2010-09-01
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to solve the existing CO 2 The problem that the adsorbent needs to be used under high pressure and has poor selectivity, the present invention provides a method for CO 2 Metal-organic framework material for adsorption and separation and its preparation method, can be used under low pressure, has good selectivity, and is easy to desorb

Method used

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  • Metal organic framework material used for absorbing and separating CO2 and preparation method thereof
  • Metal organic framework material used for absorbing and separating CO2 and preparation method thereof
  • Metal organic framework material used for absorbing and separating CO2 and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Two-step synthetic method prepares Cu-BTC / PEI composite body

[0026] The first step is to synthesize Cu-BTC crystal

[0027] 1.7922g (7.71mmol) Cu(NO 3 ) 2 2.5H 2 O was dissolved in 24ml of deionized water, 0.8806g (4.19mmol) of trimesic acid was dissolved in 24ml of ethanol, and then the two solutions were mixed in a 125ml polytetrafluoroethylene reactor. The reactor was heated from room temperature to 140° C., then continued to heat for 24 hours, and then cooled to room temperature to obtain a solution.

[0028] The above solution was filtered to remove the generated Cu-BTC blue crystals and washed three times with water and methanol respectively. Finally, the product was placed in a vacuum oven at 45°C for 2 days and stored in a desiccator. The specific surface area is 1000m 2 / g, the pore volume is 0.41cm 3 / g.

[0029]

[0030] The above are some possible coordination modes of BTC and metal ions (a) three monodentate; (b) three bidentate; ...

Embodiment 2

[0033] Example 2 Preparation of Cu-BTC / PEI composite by one-step synthesis

[0034] 1.7922g (7.71mmol) Cu(NO 3 ) 2 2.5H 2 O is dissolved in 24ml deionized water, 0.8806g (4.19mmol) 1,3,5-trimellitic acid is dissolved in 24ml ethanol, and a certain amount of polyethyleneimine PEI is dissolved in distilled water to obtain a concentration of 0.05g / ml PEI aqueous solution, then take 6ml of PEI aqueous solution and mix it with the other two solutions in a 125ml polytetrafluoroethylene reactor. The reactor was heated from room temperature to 140° C., then continued to heat for 24 hours, and then cooled to room temperature to obtain a solution. The above solution was filtered to remove the generated crystals, and the crystals were washed with water and methanol three times respectively. Finally, the product was placed in a vacuum oven at 45°C for 2 days and stored in a desiccator.

Embodiment 3

[0035] Example 3 One-step synthesis method to prepare Zn-BTC / PEI complex

[0036] 2.2936g (7.71mmol) Zn(NO 3 ) 2 ·6H 2 O is dissolved in 24ml deionized water, 0.8806g (4.19mmol) 1,3,5-trimellitic acid is dissolved in 24ml ethanol, and a certain amount of polyethyleneimine PEI is dissolved in distilled water to obtain a concentration of 0.05g / ml PEI aqueous solution, then take 6ml of PEI aqueous solution and mix it with the other two solutions in a 125ml polytetrafluoroethylene reactor. The reactor was heated from room temperature to 140° C., then continued to heat for 24 hours, and then cooled to room temperature to obtain a solution. The above solution was filtered to remove the generated crystals, and the crystals were washed with water and methanol three times respectively. Finally, the product was placed in a vacuum oven at 45°C for 2 days and stored in a desiccator.

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Abstract

The invention provides a metal organic framework material used for absorbing and separating CO2 and a preparation method thereof. The metal organic framework material is a rigid metal carboxyl compound cluster-like structure which is formed by transition metal ions and multidentate organic ligands through covalent bonds and intermolecular forces. An amine polymer is modified on the metal organic framework material; and the metal organic framework material used for absorbing and separating the CO2 has a specific surface area of 1,000 to 1,200 m<2>/g, and a pore volume of 0.4 to 0.6 cm<3>/g. The preparation method comprises the following steps of: respectively dissolving the nitrate, the chloride or the carbonate of copper or zinc and 1,3,5-trimesic acid together in a stoichiometric ratio in water or an organic solvent; mixing uniformly and sufficiently to react to obtain a BTC bridged complex crystal; and applying a product obtained by reacting an obtained BTC bridged complex crystal with the solution of polyethyleneimine to the metal organic framework material used for absorbing and separating the CO2. The material can realize selective absorption of a gas under a low pressure.

Description

technical field [0001] The invention belongs to the field of preparation of metal organic framework materials, in particular to the modification of porous metal framework materials used for carbon dioxide adsorption. Background technique [0002] With the acceleration of industrialization, global carbon dioxide emissions are increasing and causing environmental hazards. The world is currently facing the urgent task of reducing greenhouse gas emissions. Countries are scrambling to develop CO 2 While recycling and utilizing technology, new technologies and industries are also emerging. [0003] The current carbon dioxide treatment methods for flue gas are mainly physical absorption method and chemical absorption method. The physical absorption method uses a solid adsorbent, which has a large specific surface area and a large adsorption capacity per unit volume. The disadvantage is that it has no selectivity for the adsorbed gas and low adsorption efficiency; the chemical ab...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/28B01J20/30B01D53/02C01B31/20C01B32/50
CPCY02C10/08Y02C20/40Y02P20/151
Inventor 宋敏肖睿刘健金保昇钟文琪张帅
Owner SOUTHEAST UNIV
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