Comparison of experimental techniques for measuring isosteric heat of adsorption

Dongmin Shen, Martin Bülow, Flor Siperstein, Maximilian Engelhard, Alan L. Myers

    Research output: Contribution to journalArticlepeer-review


    Experimental measurements of heats of adsorption published in the literature are often in disagreement; differences of 10-20% are common. The three most widely used experimental methods are: (1) differentiation of adsorption isotherms at constant loading; (2) measurement of adsorption isosteres; (3) calorimetry. Results from these methods were compared for the systems nitrogen on CaA, oxygen on CaA, and carbon dioxide on NaX. Although the same materials and similar degassing procedures were used for all experiments, calorimetric heats are about 2 kJ/mol higher than the heats from isoteric measurements. Additional experiments are needed to bring these methods in exact agreement.
    Original languageEnglish
    Pages (from-to)275-286
    Number of pages11
    Issue number4
    Publication statusPublished - Dec 2000


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