An International Laboratory Comparison Study on Approximating the Enthalpy of Adsorption via the Clausius‐Clapeyron Approach
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- National Laboratory of the Rockies (NLR), Golden, CO (United States)
- Harvard Univ., Cambridge, MA (United States)
- Univ. of North Texas, Denton, TX (United States)
- Montana State Univ., Bozeman, MT (United States)
- Northwestern Univ., Evanston, IL (United States)
- University of Paris Est Creteil, Thiais (France); Centre National de la Recherche Scientifique (CNRS), Thiais (France). Institut de Chimie et des Matériaux Paris Est (ICMPE)
- Univ. of Cambridge (United Kingdom)
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); Univ. of California, Berkeley, CA (United States)
- Hiden Isochema, Warrington (United Kingdom)
- Federal Institute for Materials Research and Testing (BAM), Berlin (Germany); Department Hydrogen and Power‐to‐x Iberian Centre of Research in Energy Storage (FUNDECYT‐CIIAE), Cáceres (Spain)
- Max Planck Institute for Intelligent Systems, Stuttgart (Germany)
- Max Planck Institute for Intelligent Systems, Stuttgart (Germany); Tohoku Univ., Sendai (Japan)
- Numat, Chicago, IL (United States)
Materials-based gas capture and storage is an increasingly important area of research. Robust and accurate determination of material properties is required for judicial selection of materials for specific applications and for engineering materials–based systems at scale. One key property is the strength of the adsorbate–adsorbent interaction often quantified via the isosteric enthalpy of adsorption. The heat of adsorption can be measured directly through calorimetry; however, a more widely used approach is to apply the Clausius-Clapeyron (CC) equation to adsorption isotherms collected at different temperatures. While this approach appears to be straightforward, there exist multiple variants in the application of the methodologies employed. This raises the question on how these variations may or may not affect the determined results. Presented here is a discussion of the most common methodologies and a comparison of indirect determinations (via CC) of the isosteric enthalpy of adsorption by different laboratories on identical material. Included in that comparison are discussions on the measurement and analysis reproducibility. Importantly, details of the methodologies are shown to be critical when comparing enthalpies among laboratories, and different methodologies contribute to significant discrepancies and artifacts in the results. Recommendations are provided to promote robust determination and the reporting thereof.
- Research Organization:
- National Laboratory of the Rockies (NLR), Golden, CO (United States)
- Sponsoring Organization:
- USDOE Office of Energy Efficiency and Renewable Energy (EERE), Office of Sustainable Transportation. Hydrogen Fuel Cell Technologies Office (HFTO)
- Grant/Contract Number:
- AC36-08GO28308
- OSTI ID:
- 3031255
- Report Number(s):
- NLR/JA-5900-94432
- Journal Information:
- ChemPhysChem, Journal Name: ChemPhysChem Journal Issue: 7 Vol. 27; ISSN 1439-4235; ISSN 1439-7641
- Publisher:
- ChemPubSoc EuropeCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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