作者: A. F. Kloutse , R. Zacharia , D. Cossement , R. Chahine , R. Balderas-Xicohténcatl
DOI: 10.1007/S00339-015-9484-6
关键词: Calorimetry 、 Chemistry 、 Thermal 、 Physical chemistry 、 Work (thermodynamics) 、 Thermal desorption spectroscopy 、 Adsorption 、 Microporous material 、 Thermodynamics 、 Hydrogen 、 Sorption
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.