Metal-Organic Frameworks (MOFs) as methane adsorbents: From storage to diluted coal mining streams concentration

被引:38
作者
Ursueguia, David [1 ]
Diaz, Eva [1 ]
Ordonez, Salvador [1 ]
机构
[1] Univ Oviedo, Catalysis Reactors & Control Res Grp CRC, Dept Chem & Environm Engn, Julian Claveria S-N, Oviedo 33006, Spain
关键词
Methane; Mining; Selectivity; MOF; Adsorption; Separation; VENTILATION AIR METHANE; CARBON-DIOXIDE; CO2/CH4; SEPARATION; MOLECULAR-SIEVE; CH4; ADSORPTION; NATURAL-GAS; STRUCTURAL STABILITY; ACTIVATED CARBONS; CH4/N-2; MIXTURES; FACILE SYNTHESIS;
D O I
10.1016/j.scitotenv.2021.148211
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Ventilation Air Methane emissions (VAM) from coal mines lead to environmental concern because their high global warming potential and the loss of methane resources. VAM upgrading requires pre-concentration pro-cesses dealing with high flow rates of very diluted streams (< 1% methane). Therefore, methane separation and concentration is technically challenging and has important environmental and safety concerns. Among the alternatives, adsorption on Metal-Organic Frameworks (MOFs) could be an interesting option to methane selec-tive separation, due to its tuneable character and outstanding physical properties. Most of the works devoted to the methane adsorption on MOFs deal with methane storage. Therefore, these works were reviewed to determine the properties governing methane-MOF interactions. In addition, the metallic ions and organic linkers roles have been identified. With these premises, decisive effects in the methane adsorp-tion selectivity in nitrogen/methane lean mixtures have been discussed, since nitrogen is the most concentrated gas in the VAM stream, and it is very similar to methane molecule. In order to fulfill this overview, the effect of other aspects, such as the presence of polar compounds (moisture and carbon dioxide), was also considered. In addition, engineering considerations in the operation of fixed bed adsorption units and the main challenges associated to MOFs as adsorbents were also discussed.(c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http:// creativecommons.org/licenses/by/4.0/).
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页数:16
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