期刊
CARBON
卷 182, 期 -, 页码 628-633出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2021.06.011
关键词
Hydrogen; nitrogen separation; Nanoporous graphene; Ultrahigh selectivity; High permeance
资金
- National Natural Science Foundation of China (NSF) of China [12002158, 51535005, 11772152]
- National Key Research and Development Program of China [2019YFA0705400]
- Research Fund of State Key Laboratory of Mechanics and Control of Mechanical Structures [MCMS-I-0419K01]
- Fundamental Research Funds for the Central Universities [NJ2020003, NZ2020001]
- Priority Academic Program Development of Jiangsu Higher Education Institutions, Jiangsu Province NSF [BK20180065]
- Six Talent Peaks Project in Jiangsu Province [SWYY-024]
The nano-porous graphene membrane can break through the Robeson upper bound with high hydrogen permeance and ultrahigh hydrogen/nitrogen selectivity, making it a competitive candidate for hydrogen/nitrogen gas separation.
Hydrogen is mainly produced by gas separation, and a high proportion of it is separated from the hydrogen/nitrogen mixture decomposed from ammonia. However, the productivity of hydrogen by gas separation is constrained by the inevitable trade-off phenomenon between gas selectivity and per-meance, known as the Robeson upper bound. Here we find by comprehensive simulations that a bottom -up synthesized nanoporous graphene with high pore density and pinpoint pore size sharply breaks through the Robeson upper bound with high hydrogen permeance and ultrahigh hydrogen/nitrogen selectivity. Hydrogen can easily pass through the densely distributed pinpoint-sized nanopores, while no nitrogen can diffuse across the membrane due to a high energy barrier through the pore. It is also found that the membrane is mechanically strong enough to sustain the pressure for gas separation. Hydrogen permeance could be further enhanced by straining the membrane. These results show that the nano-porous graphene membrane can be a very competitive candidate for hydrogen/nitrogen gas separation. (c) 2021 Elsevier Ltd. All rights reserved.
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