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Ultramicroporous carbon granules with narrow pore size distribution for efficient CH 4 separation from coal‐bed gases
Author(s) -
Dong Ze,
Li Bei,
Shang Hua,
Zhang Peixin,
Chen Shixia,
Yang Jiangfeng,
Zeng Zheling,
Wang Jun,
Deng Shuguang
Publication year - 2021
Publication title -
aiche journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.958
H-Index - 167
eISSN - 1547-5905
pISSN - 0001-1541
DOI - 10.1002/aic.17281
Subject(s) - adsorption , carbon fibers , chemical engineering , pressure swing adsorption , coal , porosity , materials science , separation process , granulation , chemistry , chromatography , organic chemistry , composite material , composite number , engineering
The adsorptive separation of CH 4 from low‐grade coal‐bed gas can be performed at decentralized and remote coal mines, and it uses more energy‐ and is cost‐efficient than the traditional cryogenic distillation process. Herein, we present a facile method to prepare ultramicroporous carbon granules with a narrow pore‐size distribution at 0.5–0.6 nm. To our knowledge, such centered and uniform pore‐size distribution in carbon granules has never been reported. The carbon granules can be directly utilized in adsorption columns without a granulation or pelletization process. The granular oil‐tea‐shell‐derived porous carbon (GOC‐2) exhibited a record‐high CH 4 uptake of 1.82 mmol/g and CH 4 /N 2 selectivity of 5.8 at 1.0 bar and 298 K among carbon granules. The excellent CH 4 /N 2 separation performances were confirmed from the results of dynamic breakthrough experiments and pressure swing adsorption simulations. This work provides a novel strategy for developing ultramicroporous carbon granules and guides the future design of efficient CH 4 /N 2 separation adsorbents.