Sub-nanopore orifice control on carbonaceous adsorbent boosting N2/CH4 inverse separation with ultra-high selectivity

IF 10.5 2区材料科学 Q1 CHEMISTRY, PHYSICAL Carbon Pub Date : 2025-02-01 DOI:10.1016/j.carbon.2024.119922

Jiawu Huang, Cuiting Yang, Xiaoying Zhou, Xinxin Li, Zhenglin Du, Lin Zhu, Hui Yin, Guang Miao, Jing Xiao

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Abstract

Selective capture of nitrogen (N₂) to upgrade natural gas is of both environmental significance and economic benefit. The realization of carbons with superior N₂-selectivity and adsorption capacity is highly desirable but rarely reported. Herein, polydopamine-derived carbonaceous adsorbent is reported to realize the reverse adsorption separation of N₂/CH₄ with ultra-high selectivity of 11 and N₂ capacity of 47 cm³g^-1 under ambient conditions, as well as impressive separation factor of 7.7 at adsorption-desorption pressure of 20 and 1 bar. The sub-nanopore orifice of carbon as low as 0.36–0.38 nm is finely tuned by controlling the sp²C/sp³C ratio of precursors with optimized ethanol/dopamine ratio. A mathematic linear model is built between gas diffusion rates and the ratio of Ln/Md in the confined sub-nanopores of carbon. Dynamic breakthrough performances at ambient and higher pressures, as well as the exceptional cyclic stability and mild regeneration, further confirm its potential for industrial pressure-swing adsorption processes.

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来源期刊

Carbon 工程技术-材料科学：综合

CiteScore

20.80

自引率

7.30%

发文量

审稿时长

23 days

期刊介绍： The journal Carbon is an international multidisciplinary forum for communicating scientific advances in the field of carbon materials. It reports new findings related to the formation, structure, properties, behaviors, and technological applications of carbons. Carbons are a broad class of ordered or disordered solid phases composed primarily of elemental carbon, including but not limited to carbon black, carbon fibers and filaments, carbon nanotubes, diamond and diamond-like carbon, fullerenes, glassy carbon, graphite, graphene, graphene-oxide, porous carbons, pyrolytic carbon, and other sp2 and non-sp2 hybridized carbon systems. Carbon is the companion title to the open access journal Carbon Trends. Relevant application areas for carbon materials include biology and medicine, catalysis, electronic, optoelectronic, spintronic, high-frequency, and photonic devices, energy storage and conversion systems, environmental applications and water treatment, smart materials and systems, and structural and thermal applications.