We report that a porous, electron-rich, covalent, organonitridic framework (PECONF-4) exhibits an unusually high hydrogen uptake at 77 K, relative to its specific surface area. Chahine’s rule, a widely cited heuristic for hydrogen adsorption, sets a maximum adsorptive uptake of 1 wt % hydrogen at 77 K per 500 m2 of the adsorbent surface area. High-pressure hydrogen adsorption measurements in a Sieverts apparatus showed that PECONF-4 exceeds Chahine’s rule by 50%. The Brunauer–Emmett–Teller (BET) specific surface area of PECONF-4 was measured redundantly with nitrogen, argon, and carbon dioxide and found to be between 569 ± 2 and 676 ± 13 m2 g–1. Furthermore, hydrogen on PECONF-4 has a high heat of adsorption, in excess of 9 kJ mol–1.
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机译：我们报告说，相对于其比表面积，多孔的，富电子的，共价的有机氮骨架（PECONF-4）在77 K处显示出异常高的氢吸收。 Chahine法则是被广泛引用的氢吸附启发法，设定每500 m 2 吸附剂表面积77 K时最大吸收1 wt％氢。在Sieverts装置中进行的高压氢吸附测量表明，PECONF-4比Chahine的法则高出50％。用氮气，氩气和二氧化碳多余地测量了PECONF-4的Brunauer-Emmett-Teller（BET）比表面积，发现其在569±2和676±13 m 2 g < sup> –1 。此外，PECONF-4上的氢具有很高的吸附热，超过9 kJ mol -1 。
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