ZIF-8衍生氮掺杂多孔碳的制备及其对低浓度煤层气中CH<sub>4</sub>/N<sub>2</sub>的吸附分离研究

doi:10.11896/cldb.23090093

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Abstract In order to make the best use of low concentration coalbed methane (CBM), simultaneously slow down the trend of global warming, it is an imperative and challenging work to develop a porous carbon adsorbent for the realization of effective separation of CH₄ from CH₄/N₂ mixture. Herein, N-doped porous carbon adsorbent has been successfully synthesized by using ZIF-8 as precursor and self-sacrificing template. The effects of carbonization temperature and carbonization time on the porosity structure and nitrogen content of the as-prepared carbon materials have been systematically analyzed. Combined with the testing of isothermal adsorption of CH₄ and N₂, the properties of carbon materials for CH₄/N₂ adsorptive separation have been analyzed. Under the carbonization temperature of 1 000 ℃ and the carbonization time of 1 h, the as-prepared carbon material NPC-1000-1 showed the optimal CH₄ adsorption capacity of 1.52 mmol/g and CH₄/N₂ separation performance. Accor-ding to Henry’s law, the CH₄/N₂ selectivity coefficient was 3.73, while according to the ideal solution adsorption theory (IAST), the selectivity coefficient for binary gas CH₄/N₂ (30/70) was 4.72 under a certain pressure of 0.1 MPa, which was mainly contributed to the synergistic effect of the excellent porosity structure and desirable nitrogen content of the sample. This study provides a new approach for the preparation of porous carbon adsorbents and a theoretical support for the effective development and utilization of coalbed methane and environmental protection.

Key words： ZIF-8 N-doped porous carbon CH₄/N₂ adsorptive separation

Published: 25 December 2024 Online: 2024-12-20

CLC number:

TE991

Fund:National Natural Science Foundation Youth Fund of China (42002164) and Safety Discipline “Double First-class” Construction Discipline Cultivation Project (AQ20230707).

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	CHEN Yisi
	ZHANG Hongtu
	WANG Binbin
	LI Yao

Cite this article:

CHEN Yisi,ZHANG Hongtu,WANG Binbin, et al. Research on the Preparation of ZIF-8 Derived Nitrogen-doped Porous Carbon and Its CH₄/N₂ Adsorptive Separation from Low Concentration Coalbed Methane[J]. Materials Reports, 2024, 38(24): 23090093-8.

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http://www.mater-rep.com/EN/10.11896/cldb.23090093 OR http://www.mater-rep.com/EN/Y2024/V38/I24/23090093

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