Hydrogen isotherms for MOF-177, Zn4O(1,3,5-benzenetribenzoate)2, crystals were independently measured by volumetric and gravimetric methods at 77 K to confirm its hydrogen uptake capacity and to establish the importance of calibrating gas adsorption instrumentation prior to evaluating H2 storage capacities. Reproducibility of hydrogen adsorption experiments is important because non-systematic errors in measurements can easily occur leading to erroneous reports of capacities. The surface excess weight percentage of hydrogen uptake in MOF-177 samples is 7.5 wt% at 70 bar, which corresponds to an absolute adsorbed amount of 11 wt%. These values are in agreement with our previous report and with those found independently by Southwest Research Institute. Considering its well-known structure and its significant H2 uptake properties, we believe MOF-177 is an excellent material to serve as a benchmark adsorber.
在 77 K 温度下,采用体积法和重量法独立测量了 MOF-177、Zn4O(1,3,5-苯三
苯甲酸酯)2 晶体的氢等温线,以确认其氢吸收能力,并确定在评估氢储存能力之前校准气体吸附仪器的重要性。
氢气吸附实验的可重复性非常重要,因为测量中很容易出现非系统误差,从而导致错误的容量报告。在 70 bar 条件下,MOF-177 样品吸氢的表面过量重量百分比为 7.5 wt%,相当于 11 wt% 的绝对吸附量。这些数值与我们之前的报告以及西南研究院独立发现的数值一致。考虑到 MOF-177 众所周知的结构及其显著的 H2 吸收特性,我们认为 MOF-177 是用作基准吸附剂的绝佳材料。