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A nitrogen-doped carbon material prepared from a porous nitrogen-containing polymer as a precursor and its application

A nitrogen-doped carbon and polymer technology, applied in gas treatment, other chemical processes, separation methods, etc., can solve the problems of high cost and cumbersome preparation process, and achieve the advantages of reducing preparation cost, saving reaction time, and high specific surface area. Effect

Active Publication Date: 2020-10-30
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, most of the nitrogen-doped carbon materials used in the literature are prepared from metal-organic framework materials or porous organic framework materials with relatively expensive monomers, and the preparation process is relatively cumbersome and costly.

Method used

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  • A nitrogen-doped carbon material prepared from a porous nitrogen-containing polymer as a precursor and its application
  • A nitrogen-doped carbon material prepared from a porous nitrogen-containing polymer as a precursor and its application
  • A nitrogen-doped carbon material prepared from a porous nitrogen-containing polymer as a precursor and its application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Example 1: Preparation of nitrogen-doped carbon material NC-1

[0037] Add 20mL 1,2-dichloroethane, 0.391g (3.33mmol) indole monomer into the reaction kettle, stir until the indole is completely dissolved, add about 1.77mL (20mmol) dimethyl formal, stir for 5min, then add 3.25g (20mmol) FeCl 3 , stirred for 5 minutes, put the reaction kettle into a microwave synthesizer for reaction, set the temperature rise program, raised the temperature from room temperature to 45°C, kept it for 20min, and then raised the temperature to 80°C for 1 hour. After the reaction, cool to room temperature, take out the reaction kettle, add a small amount of methanol in the reaction kettle, stir until the polymer solid is uniformly dispersed, filter with suction, and pass the solid through a mixed solution of tetrahydrofuran, methanol, methanol and hydrochloric acid (the volume ratio of methanol and hydrochloric acid 0.5, the concentration of hydrochloric acid is 2mol / L) Soxhlet extraction for...

Embodiment 2

[0040] Example 2: Preparation of nitrogen-doped carbon material NC-2

[0041] This embodiment is basically the same as Embodiment 1, except that the potassium hydroxide that adds 1 / 2th of the porous nitrogen-containing polymer quality, i.e. M 多孔含氮聚合物 :M KOH =2:1. The measured specific surface area is 636m 2 / g, the carbon dioxide adsorption capacity at 25°C and 1 atmospheric pressure is 3.57mmol / g, CO 2 / N 2 Selectivity is 75.

Embodiment 3

[0042] Example 3: Preparation of nitrogen-doped carbon material NC-3

[0043] This embodiment is basically the same as Example 1, except that the potassium hydroxide that adds a quarter of the porous nitrogen-containing polymer quality, i.e. M 多孔含氮聚合物 :M KOH =4:1. The measured specific surface area is 326m 2 / g, the carbon dioxide adsorption capacity at 25°C and 1 atmospheric pressure is 2.58mmol / g, CO 2 / N 2 Selectivity is 101.

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Abstract

The invention belongs to the field of porous nitrogen-doped carbon materials and in particular relates to a nitrogen-doped carbon material by taking a porous nitrogenous polymer as a precursor and application of the material in carbon dioxide adsorption. The preparation method comprises the following steps: preparing a super-crosslinked micro-porous polymer from a nitrogen heterocyclic monomer through Friedel-Crafts alkylation reaction, removing a catalyst FeCl3 by utilizing Soxhlet extraction, impregnating the dried solid with an alkaline solution, evaporating the solvent to dryness, and roasting, thereby obtaining the carbon material. Compared with other common carbon materials, the nitrogen-doped porous carbon material disclosed by the invention is high in specific surface area and richin quantity of pores, and the nitrogen atoms can be uniformly distributed in the carbon material. Moreover, the preparation process of the carbon precursor is simple, the carbon material is low in price and readily available, the process is green and clean, the operation is simple and efficient, the controllability is high, the carbon material morphology is adjustable, and large-scale productioncan be realized. The material disclosed by the invention has excellent adsorptivity and CO2 / N2 selectivity in the field of carbon dioxide adsorption, and has important industrial application prospect.

Description

technical field [0001] The invention belongs to the field of porous nitrogen-doped carbon materials. It specifically relates to a nitrogen-doped carbon material prepared by using a porous nitrogen-containing polymer as a precursor and its application in carbon dioxide adsorption. Background technique [0002] Due to the excessive emission of carbon dioxide gas caused by the burning of fossil fuels, the greenhouse effect has been triggered, leading to a series of ecological deterioration phenomena such as sea level rise, global warming, and polar climate deterioration, making the earth's ecology and environment face serious threats. As far as the status quo is concerned, we need to stabilize the current atmospheric CO2 by controlling the amount of CO2 in the atmosphere 2 concentration. The leading current carbon dioxide adsorption technology in the industry is the liquid ammonia adsorption method, which consumes a lot of energy and high energy consumption during liquid circ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/02B01J20/20B01J20/30
CPCB01D53/02B01D2257/504B01J20/0259B01J20/20B01J20/28066B01J2220/4812Y02C20/40
Inventor 杨启华李贺任小敏
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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