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an adsorbed co 2 Preparation method of porous carbon material doped with nitrogen

A technology of nitrogen-doped porous carbon and quaternary ammonium base, which is applied in the field of porous carbon materials, can solve the problems of less active functional groups in the specific surface area of ​​carbon materials, time-consuming and laborious regeneration of polyurethane, and poor compatibility of carbon structures, so as to increase CO2 adsorption capacity , Adsorption selectivity and cycle regeneration performance are excellent, and the effect of high adsorption capacity

Active Publication Date: 2022-03-18
TAIYUAN UNIV OF TECH
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Problems solved by technology

CN103157436A reports a CO adsorption 2 The preparation method of pine nut shell-based activated carbon is that the pine nut powder is first carbonized at 500 ℃, then impregnated with KOH solution for 48 h, and then chemically activated at 500-900 ℃. Although the specific surface area can reach 966-1944 m 2 / g, but due to the poor compatibility between the inorganic base and the carbon structure generated by high-temperature activation, the generated carbon material has a large specific surface area but less active functional groups, and the prepared activated carbon has a low CO 2 The highest adsorption capacity is only 5.0 mmol / g, and the average adsorption capacity of the samples is 4.0 mmol / g
According to the report of the document Polymer Engineering & Science 2013, 53(7): 1357, it can be seen that the regeneration of waste polyurethane is time-consuming and laborious, and most of it is directly incinerated. However, a large amount of nitrogen oxides and carbon oxides are produced, causing serious environmental pollution.

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  • an adsorbed co <sub>2</sub> Preparation method of porous carbon material doped with nitrogen
  • an adsorbed co <sub>2</sub> Preparation method of porous carbon material doped with nitrogen
  • an adsorbed co <sub>2</sub> Preparation method of porous carbon material doped with nitrogen

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Embodiment 1

[0034] The discarded polyurethane foam was broken into 2 mm*2 mm*2 mm particles, and 10 g was immersed in 15 g of tetramethylammonium hydroxide solution with a mass fraction of 25% under the condition of vacuum magnetic stirring for 2 h , and then dried in a vacuum oven at 55 °C for 30 h, cooled and placed in a tube furnace with continuous flow of N at a rate of 80 ml / min. 2 And the temperature was raised to 500 °C at a rate of 5 °C / min and kept for 2.5 h for chemical activation and nitrogen fixation; followed by direct CO 2 Physical activation, that is, the rate of 5 ℃ / min is raised to 900 ℃ and the N 2 Change to CO 2 , to create ultra-micropores with a pore size of less than 1 nm, through which CO 2 The rate is 35ml / min and kept for 2 hours, switch to N immediately after activation 2 , when it is protected down to room temperature, the polyurethane foam-based nitrogen-doped porous carbon material is obtained.

[0035] Depend on figure 1 a It can be seen that the surface...

Embodiment 2

[0038] The discarded polyurethane foam was broken into 3 mm*3 mm*3 mm particles, and 10 g was immersed in 25 g of tetraethylammonium hydroxide solution with a mass fraction of 25% under the condition of vacuum magnetic stirring for 4 h , and then dried in a vacuum oven at 65 °C for 25 h, cooled and placed in a tube furnace to continuously feed N at a rate of 100 ml / min. 2 And the temperature was raised to 600 °C at a rate of 8 °C / min and kept for 2 h for chemical activation and nitrogen fixation; followed by direct CO 2 Physical activation, i.e. rising to 800 °C at a rate of 5 °C / min and N 2 Change to CO 2 , to create ultra-micropores with a pore size of less than 1 nm, through which CO 2 The rate is 25ml / min and kept for 2 hours, switch to N immediately after activation 2 , when it is protected down to room temperature, the polyurethane foam-based nitrogen-doped porous carbon material is obtained. Its BET specific surface area is 1247 m 2 / g, the pore volume of ultramicr...

Embodiment 3

[0041] The discarded polyurethane foam was broken into 4 mm*4 mm*4 mm particles, and 10 g was immersed in 8 g of tetrapropylammonium hydroxide solution with a mass fraction of 25% under the condition of vacuum magnetic stirring for 6 h , then dried in a vacuum oven at 75 °C for 20 h, cooled and placed in a tube furnace, and continuously fed N at a rate of 90 ml / min. 2 And the temperature was raised to 500 °C at a rate of 5 °C / min and kept for 2.5 h for chemical activation and nitrogen fixation; followed by direct CO 2 Physical activation, that is, the rate of 5 ℃ / min is raised to 1000 ℃ and the N 2 Change to CO 2 , to create ultra-micropores with a pore size of less than 1 nm, through which CO 2 The rate is 35ml / min and maintained for 1.5 h, switch to N immediately after activation 2 , when it is protected down to room temperature, the polyurethane foam-based nitrogen-doped porous carbon material is obtained. Its BET specific surface area is 1510 m 2 / g, the pore volume o...

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Abstract

The invention relates to the field of porous carbon materials, in particular to a CO adsorption 2 Preparation method of nitrogen-doped porous carbon materials. an adsorbed CO 2 A method for preparing porous carbon materials doped with nitrogen, breaking waste polyurethane foam into particles of 2mm*2mm*2mm~5mm*5mm*5mm, and then placing them in a quaternary ammonium base with a mass percentage of 25% Immerse in the aqueous solution for 1-10 h, after the impregnation is completed, dry it in vacuum at 50-80°C for 10-30 h; put the polyurethane foam impregnated with quaternary 2 Low-temperature chemical activation treatment is carried out under the atmosphere; without cooling and pickling, the activated product is directly subjected to CO 2 Physical activation, that is, to obtain adsorbed CO with large specific surface area and micropore volume and rich nitrogen content 2 The porous carbon material is doped with nitrogen.

Description

technical field [0001] The invention relates to the field of porous carbon materials, in particular to a CO adsorption 2 Preparation method of nitrogen-doped porous carbon materials. Background technique [0002] The economic development of human society relies on energy, and the combustion of fossil fuels such as coal, oil, and natural gas is the main way of energy supply. During this process, a large amount of CO is released. 2 As a result of global warming and sea level rise, serious environmental and ecological problems have emerged. Therefore, the development cost is low, the efficiency is high, and the selectivity of CO 2 Capture technology is of great significance. [0003] Currently, the separation and capture of CO 2 The most common methods are solvent absorption method, membrane separation method, chemical and physical adsorption method and low temperature freezing separation method. Among them, the adsorption method has the potential for large-scale applicati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B32/336C01B32/342C01B32/324B01J20/20B01J20/28B01D53/02
CPCC01B32/336C01B32/342C01B32/324B01J20/20B01J20/28052B01D53/02B01D2257/504Y02C20/40Y02P20/151
Inventor 葛超杨颂卢建军刘妙青
Owner TAIYUAN UNIV OF TECH
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