Direct determination of enthalpies of sorption using pressure-gradient differential scanning calorimetry: CO2 sorption by Cu-HKUST

Feldmann, Wesley K. ; White, Kerry-Anne ; Bezuidenhout, Charl X. ; Smith, Vincent J. ; Esterhuysen, Catharine ; Barbour, Leonard J. (2020-06-01)

CITATION: Feldmann, W. K. et al. 2020. Direct Determination of Enthalpies of Sorption Using Pressure-Gradient Differential Scanning Calorimetry: CO2 Sorption by Cu-HKUST. ChemSusChem, 13(1): 102-105. doi:10.1002/cssc.201902990

The original publication is available at


Enthalpy of sorption (ΔH) is an important parameter for the design of separation processes using adsorptive materials. A pressure-ramped calorimetric method is described and tested for the direct determination of ΔH values. Combining a heatflow thermogram with a single sorption isotherm enables the determination of ΔH as a function of loading. The method is validated by studying CO2 sorption by the well-studied metal–organic framework Cu-HKUST over a temperature range of 288–318 K. The measured ΔH values compare well with previously reported data determined by using isosteric and calorimetric methods. The pressure-gradient differential scanning calorimetry (PGDSC) method produces reliable high-resolution results by direct measurement of the enthalpy changes during the sorption processes. Additionally, PGDSC is less labor-intensive and time-consuming than the isosteric method and offers detailed insight into how ΔH changes over a given loading range.

Please refer to this item in SUNScholar by using the following persistent URL:
This item appears in the following collections: