Abstract
Adsorbed natural gas (ANG) systems involve using porous materials to increase the working capacity and/or reduce the storage pressure compared to compressed natural gas (CNG). Flexible metal-organic materials (FMOMs) are particularly interesting in this context since their stepped isotherms can afford increased working capacity if the adsorption/desorption steps occur within the proper pressure range. We report herein that metal doping in a family of isostructural FMOMs, ML2 (M=Co, Ni or NixCo1−x, L=4-(4-pyridyl)-biphenyl-4-carboxylic acid), enables control over the gate opening between non-porous (closed) and porous (open) phases at pressures relevant to methane storage. Specifically, methane-induced phase transformations can be fine-tuned by using different Ni/Co ratios to enhance methane working capacity. The optimal working capacity from 5 to 35 bar at 298 K (153 cm3 cm−3) was found for Ni0.89Co0.11L2 (X-dia-1-Ni0.89Co0.11), which is greater than that of benchmark rigid MOFs.
Original language | English |
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Article number | e202300069 |
Journal | ChemSusChem |
Volume | 16 |
Issue number | 9 |
DOIs | |
Publication status | Published - 5 May 2023 |
Keywords
- adsorption
- gate opening
- metal–organic materials
- methane storage
- working capacity