氮掺杂柔性块体多孔碳的制备及对CO<sub>2</sub>/CH<sub>4</sub>的吸附分离研究

doi:10.11896/cldb.22050326

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Abstract To develop an economical, efficient and simple prepared bulk porous carbon material for the adsorption and separation of CO₂/CH₄, melamine sponge was selected as both the precursor material for the support framework of bulk porous carbon and the nitrogen source. Glucose was introduced as a secondary carbon source, and CO₂ was used as an active agent to prepare nitrogen-doped flexible bulk porous carbon through one-step carbonization-activation method. The effects of glucose loading, activation temperature, and activation time on the porosity and chemical composition were discussed. The results indicated that at the glucose loading was 0.5 g, the activation temperature was 800 ℃, and the activation time was 3 h, the sample AMC-800-3 exhibited the largest specific surface area of 845 m²/g, the highest total volume of 0.37 cm³/g, and the most developed microporous structure. The micropore volume was up to 0.30 cm³/g, accounting for 81% of the total pore volume, and ultra-micropore volume was up to 0.26 cm³/g, accounting for 70% of the total pore volume. At 25 ℃ and 0.1 MPa, AMC-800-3 exhibited the highest CO₂ adsorption capacity of 2.84 mmol/g. According to Henry's law, the intrinsic selectivity of AMC-800-3 for CO₂/CH₄ calculated via the initial slope of the adsorption isotherm at low pressure (<0.015 MPa), was 2.70, which was the best of all the activated samples. According to ideal adsorption solution theory (IAST), the selectivity of AMC-800-3 for the equimolar binary mixture CO₂/CH₄ (50V/50V) was 2.35 at 0.1 MPa, which is attributed to the synergistic effect of the excellent microporous structure and a certain amount of nitrogen content. Under further dynamic breakthrough experiments, the dynamic selectivity result of AMC-800-3 for CO₂/CH₄ (50V/50V) was close to that calculated by IAST. Therefore, the as-prepared flexible nitrogen-doped bulk porous carbon is expected to be applicable for reducing carbon emissions and improving the utilization rate of coalbed methane.

Key words： nitrogen-doped flexible bulk porous carbon CO₂/CH₄ adsorptive separation

Published: 25 November 2023 Online: 2023-11-21

CLC number:

TE991

Fund:National Natural Science Foundation of China (42002164,U1804156) and Natural Science Foundation of Henan Province (202300410171).

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	WANG Yage
	WANG Binbin
	YANG Dewei
	LI Yao

Cite this article:

WANG Yage,WANG Binbin,YANG Dewei, et al. Nitrogen-doped Flexible Bulk Porous Carbon: Preparation and Application for CO₂/CH₄ Adsorption and Separation[J]. Materials Reports, 2023, 37(22): 22050326-9.

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http://www.mater-rep.com/EN/10.11896/cldb.22050326 OR http://www.mater-rep.com/EN/Y2023/V37/I22/22050326

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