4.8 Article

Metal Doping to Control Gate Opening and Increase Methane Working Capacity in Isostructural Flexible Diamondoid Networks

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CHEMSUSCHEM
卷 -, 期 -, 页码 -

出版社

WILEY-V C H VERLAG GMBH
DOI: 10.1002/cssc.202300069

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adsorption; metal-organic materials; methane storage; gate opening; working capacity

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Adsorbed natural gas (ANG) systems using porous materials can increase working capacity and reduce storage pressure. Metal doping in flexible metal-organic materials (FMOMs) allows control over the gate opening between porous and non-porous phases, enhancing methane working capacity. Ni0.89Co0.11L2 (X-dia-1-Ni0.89Co0.11) exhibited the highest working capacity of 153 cm(3) cm(-3) at 298 K, surpassing benchmark rigid MOFs.
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 cm(3) cm(-3)) was found for Ni0.89Co0.11L2 (X-dia-1-Ni0.89Co0.11), which is greater than that of benchmark rigid MOFs.

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