Journal
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
Volume 22, Issue 2, Pages 261-276Publisher
SPRINGER
DOI: 10.1007/s10450-016-9766-0
Keywords
Adsorption equilibria; Net adsorption; Excess adsorption; Absolute adsorption; Helium adsorption
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Funding
- EPSRC [EP/J02077X/1]
- Engineering and Physical Sciences Research Council [EP/J02077X/1] Funding Source: researchfish
- EPSRC [EP/J02077X/1] Funding Source: UKRI
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The definitions of absolute, excess and net adsorption in microporous materials are used to identify the correct limits at zero and infinite pressure. Absolute adsorption is shown to be the fundamental thermodynamic property and methods to determine the solid density that includes the micropore volume are discussed. A simple means to define when it is necessary to distinguish between the three definitions at low pressure is presented. To highlight the practical implications of the analysis the case of adsorption of helium is considered in detail and a combination of experiments and molecular simulations is used to clarify how to interpret adsorption measurements for weakly adsorbed components.
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