期刊
AICHE JOURNAL
卷 67, 期 9, 页码 -出版社
WILEY
DOI: 10.1002/aic.17281
关键词
binderless; carbon granules; methane concentration; narrow pore‐ size distribution; ultramicroporous adsorbent
资金
- National Natural Science Foundation of China [21908090]
- Natural Science Foundation of Jiangxi Province [20192ACB21015]
The study introduces a simple method to prepare ultramicroporous carbon granules with a narrow pore-size distribution, which show efficient CH4/N-2 separation capabilities. The granular oil-tea-shell-derived porous carbon (GOC-2) exhibited excellent CH4 adsorption and separation performance at 1.0 bar and 298K.
The adsorptive separation of CH4 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 CH4 uptake of 1.82 mmol/g and CH4/N-2 selectivity of 5.8 at 1.0 bar and 298 K among carbon granules. The excellent CH4/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 CH4/N-2 separation adsorbents.
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