Isosteric heat of hydrogen adsorption on MOFs: comparison between adsorption calorimetry, sorption isosteric method, and analytical models

作者: A. F. Kloutse , R. Zacharia , D. Cossement , R. Chahine , R. Balderas-Xicohténcatl

DOI: 10.1007/S00339-015-9484-6

关键词: CalorimetryChemistryThermalPhysical chemistryWork (thermodynamics)Thermal desorption spectroscopyAdsorptionMicroporous materialThermodynamicsHydrogenSorption

摘要: Isosteric heat of adsorption is an important parameter required to describe the thermal performance adsorptive storage systems. It most frequently calculated from isotherms measured over wide ranges pressure and temperature, using so-called isosteric method. Direct quantitative estimation heats on other hand possible coupled calorimetric–volumetric method, which involves simultaneous measurement adsorption. In this work, we compare hydrogen microporous materials by both methods. Furthermore, experimental data are compared with obtained modified Dubinin–Astakhov, Toth, Unilan analytical models establish reliability limitations simpler methods assumptions. To end, measure five prototypical metal–organic frameworks: MOF-5, Cu-BTC, Fe-BTC, MIL-53, MOF-177 For all MOFs, find a very good agreement between calorimetric throughout range loading studied. Models’ prediction deviates experiments depending MOF studied loading. Under low-loadings less than 5 mol kg−1, decreases in order Cu-BTC > MIL-53 MOF-5 Fe-BTC MOF-177. The coherent strength interaction revealed previous desorption spectroscopy measurements.

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