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Direct Determination of Enthalpies of Sorption Using Pressure-Gradient Differential Scanning Calorimetry: CO2 Sorption by CuHKUST.

07:00 EST 8th November 2019 | BioPortfolio

Summary of "Direct Determination of Enthalpies of Sorption Using Pressure-Gradient Differential Scanning Calorimetry: CO2 Sorption by CuHKUST."

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 was validated by studying CO2 sorption by the well-studied metal-organic framework CuHKUST over a temperature range of 288 - 318 K. The measured ΔH values compare well with previously reported data determined using isosteric and calorimetric methods. The pressure-gradient differential scanning calorimetry (PGDSC) method produces reliable high-resolution results by direct measurement of the enthalphy 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.

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Name: ChemSusChem
ISSN: 1864-564X
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