Method for improving CO2 adsorption of MOF (metal-organic framework) material

A metal-organic framework and carbon dioxide technology, applied in the field of inorganic-organic hybrid preparation, can solve the problems of reducing carbon dioxide adsorption capacity and selectivity, reducing carbon dioxide adsorption and selectivity, and skeleton structure collapse, so as to improve hydrophobicity and Effects of water stability, low raw material cost, and improved adsorption performance

Inactive Publication Date: 2017-01-04
BEIJING INSTITUTE OF TECHNOLOGYGY
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Problems solved by technology

(4) Designing pores that match the size of the separated molecules increases the amount of carbon dioxide adsorption, which is difficult to design
[0004] However, in practical applications, the components in the flue gas after combustion, except for 75% N 2 and 15% CO 2 In addition, it also contains 5%-7% water, which has a great influence on the adsorption of carbon dioxide, because water molecules have high polarity and binding energy, which will be absorbed in the process of carbon dioxide adsorption. There is a strong competition, and the active adsorption sites of MOF materials are easily occupied by these small amounts of water
This allows for reduced CO2 adsorption and selectivity in the presence of small amounts of water
On the other hand, the presence of water molecules will also collapse the framework structure of MOF materials, which will also reduce the adsorption capacity and selectivity of carbon dioxide.

Method used

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  • Method for improving CO2 adsorption of MOF (metal-organic framework) material
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  • Method for improving CO2 adsorption of MOF (metal-organic framework) material

Examples

Experimental program
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Effect test

Embodiment 1

[0064] A method for improving the carbon dioxide adsorption of metal-organic framework materials, the specific steps of the method are as follows:

[0065] (1) Synthesis of 1,2-bis(trimethylsilylethynyl)benzene

[0066] 0.2669g Pd (PPh 3 ) 4 and 0.0440g CuI, added to a 100mL three-neck flask, and repeated vacuuming and nitrogen filling three times. Place 15mL of triethylamine and 45mL of toluene in a conical flask to obtain a mixed solution, blow nitrogen gas, and inject the mixed solution into the three-necked flask, add 2.5400g of 1,2-diiodobenzene and 1.8905g of trimethyl Silica acetylene was added to the three-necked flask, and the reaction was stirred at 25 °C for 20 h to obtain a black product, which was filtered with suction to obtain a yellow solution, which was evaporated to dryness to obtain an oily yellow liquid; the yellow liquid was analyzed by wet column chromatography ( Petroleum ether as eluent) was separated, rotary evaporated to dryness, and light yellow o...

Embodiment 2

[0078] A method for improving the carbon dioxide adsorption of metal-organic framework materials, the specific steps of the method are as follows:

[0079] (1) Synthesis of 1,2-bis(trimethylsilylethynyl)benzene

[0080] Prepare 1,2-bis(trimethylsilylethynyl)benzene according to the method of step (1) of Example 1

[0081] The volumes of triethylamine and toluene used were 60 mL and 60 mL, respectively; 1,2-diiodobenzene, trimethylsilylacetylene, Pd(PPh 3 ) 4 The masses of , CuI were 2.5400g, 1.8905g, 0.3559g, 0.0587g respectively; the stirring temperature was 20°C, and the reaction time was 15h.

[0082] The structure of the light yellow oily liquid was characterized by NMR spectroscopy, and the corresponding data were as follows: 1 H NMR (400MHz, CDCl 3 ): δ0.27(s, 18H), 7.24(q, 2H), 7.47(q, 2H), it can be seen that the light yellow oily liquid is 1,2-bis(trimethylsilylethynyl)benzene.

[0083] (2) Preparation of DEB

[0084] DEB was synthesized according to the method ...

Embodiment 3

[0093] A method for improving the carbon dioxide adsorption of metal-organic framework materials, the specific steps of the method are as follows:

[0094] (1) Synthesis of 1,2-bis(trimethylsilylethynyl)benzene

[0095] 1,2-Bis(trimethylsilylethynyl)benzene was prepared according to the method of step (1) of Example 1. The volumes of triethylamine and toluene used were 15 mL and 60 mL, respectively; 1,2-diiodobenzene, trimethylsilylacetylene, Pd(PPh 3 ) 4 , the masses of CuI were 2.5400g, 1.8905g, 0.5338g, 0.0880g respectively; the stirring temperature was 70°C and the time was 25h.

[0096] The structure of the light yellow oily liquid was characterized by NMR spectroscopy, and the corresponding data were as follows: 1 H NMR (400MHz, CDCl 3 ): δ0.27(s, 18H), 7.24(q, 2H), 7.47(q, 2H), it can be seen that the light yellow oily liquid is 1,2-bis(trimethylsilylethynyl)benzene.

[0097] (2) Preparation of DEB

[0098] DEB was synthesized according to the method of step (2) o...

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Abstract

The invention discloses a method for improving CO2 adsorption of an MOF (metal-organic framework) material and belongs to the technical field of preparation of inorganic-organic hybridization. The method specifically comprises steps as follows: various porous MOF materials are prepared through synthesis with specific methods, various o-diyne aromatic compound monomers are synthesized with organic synthesis methods, organic monomers enter pore channels of the MOF materials through soaking, through simple thermal initiated polymerization reactions, the organic monomers are subjected to polymerization reactions in the pore channels of the MOF materials, and the MOF composite material is obtained. The polymer produced with the method can divide the pore channels of the MOF materials into smaller pore chambers suitable for capture of CO2, so that the CO2 adsorption capacity and selectivity of the MOF materials are improved. The thermal initiated polymerization method is easy to operate, the processing and molding speed is high, the cost of raw materials is low, and the method has industrial advantages.

Description

technical field [0001] The invention relates to a method for improving carbon dioxide adsorption of metal-organic framework materials, and belongs to the technical field of inorganic-organic hybrid preparation. Background technique [0002] The main source of carbon dioxide is the burning of fossil fuels, which has caused great environmental problems. At present, the most advanced and mature method for capturing carbon dioxide is alkanolamine solution, but since the regeneration from the generated carbamate to alkanolamine solution is an irreversible process, this method inevitably leads to a huge amount of energy. waste. Metal-organic frameworks (MOFs), as a new type of porous polymer materials, are composed of metal ions or metal clusters connected by organic ligands to form a one-dimensional, two-dimensional or three-dimensional network structure, so it has both inorganic and organic properties. The advantages of the material. Due to their high porosity, ordered open p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J20/26B01J20/30B01D53/02
CPCB01D53/02B01D2257/504B01J20/223B01J20/26Y02C20/40
Inventor 冯霄丁难王博
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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