Metal–organic framework (MOF-177) was synthesized, characterized and evaluated for hydrogen adsorption as a potential adsorbent for hydrogen storage. The hydrogen adsorption equilibrium and kinetic data were measured in a volumetric unit at low pressure and in a magnetic suspension balance at hydrogen pressure up to 100 bar. The MOF-177 adsorbent was characterized with nitrogen adsorption for pore textural properties, scanning electron microscopy for morphology and particle size, and X-ray powder diffraction for phase structure. The MOF-177 synthesized in this work was found to have a uniform pore size distribution with median pore size of 12.7 Å, a higher specific surface area (Langmuir: 5994 m²/g; BET: 3275 m²/g), and a higher hydrogen adsorption capacity (11.0 wt.% excess adsorption, 19.67 wt.% absolute adsorption) than previously reported values on MOF-177. Freundlich equation fits well the hydrogen adsorption isotherms at low and high pressures. Diffusivity and isosteric heat of hydrogen adsorption were estimated from the hydrogen adsorption kinetics and equilibrium data measured in this work.

中文翻译：

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MOF-177中氢吸附的平衡，动力学和焓

合成，表征了有机金属框架（MOF-177），并评估了其作为氢存储的潜在吸附剂的氢吸附能力。在低压下以体积单位测量氢气吸附平衡和动力学数据，在氢气压力最高为100 bar的情况下在磁悬浮平衡下进行测量。MOF-177吸附剂的特征在于，氮吸附具有孔隙结构特性，扫描电子显微镜具有形态和粒度，X射线粉末衍射具有相结构。发现在这项工作中合成的MOF-177具有均匀的孔径分布，中值孔径为12.7Å，比表面积更高（Langmuir：5994 m ² / g； BET：3275 m ²/ g），并且比先前在MOF-177上报道的值更高的氢吸附能力（11.0 wt。％的过量吸附，19.67 wt。％的绝对吸附）。Freundlich方程非常适合低压和高压下的氢吸附等温线。根据这项工作中测得的氢吸附动力学和平衡数据估算了氢吸附的扩散性和等排热。