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Facile and Controllable Preparation of Ultramicroporous Biomass-Derived Carbons and Application on Selective Adsorption of Gas-mixtures

Zhang, Yan, Zhang, Peixin, Yu, Weikang, Wang, Jun, Deng, Qiang, Yang, Jiangfeng, Zeng, Zheling, Xu, Mai, Deng, Shuguang
Industrial & engineering chemistry process design and development 2018 v.57 no.42 pp. 14191-14201
adsorption, carbon dioxide, macropores, methane, micropores, nitrogen, porosity, process design, surface area
It is very challenging to prepare biomass-derived porous carbons with well-confined ultramicropores. Traditionally, biomass-derived carbons, via a chemical activation process, possess wide pore size distributions from micropores to macropores. Outstanding BET surface area of 2676 ± 107 m² g–¹ was obtained with excellent CO₂ uptake of 6.15 and 2.26 mmol g–¹ under 1 and 0.15 bar at 273 K. Furthermore, the outstanding CO₂/N₂, CO₂/CH₄, and CH₄/N₂ selectivities of 43.5, 7.4, and 5.9 were obtained on an OTS-1-550 at 298 K and 1 bar. The pore size effect on CO₂ capture and gas-separation performance was carefully investigated, indicating that the ultramicropores (<1 nm) governed the CO₂ adsorption capacity at 1 bar. Also, the vacuum swing adsorption (VSA) processes and breakthrough experiments have confirmed their practical application potential.