Journal
ADSORPTION-JOURNAL OF THE INTERNATIONAL ADSORPTION SOCIETY
Volume 27, Issue 3, Pages 295-318Publisher
SPRINGER
DOI: 10.1007/s10450-020-00276-7
Keywords
Adsorption kinetics; Gravimetric measurements; Volumetric measurements
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The availability of commercial gravimetric and volumetric systems for measuring adsorption equilibrium has led to an increased use of these instruments for measuring adsorption kinetics. However, a review of publications from the past 20 years identified worrying trends, such as lack of information on experimental conditions and use of inappropriate models for data analysis. In order to provide guidance, this study discusses appropriate models for diffusion in porous materials and common practices in recent publications, concluding with recommendations to avoid misinterpretation of experiments.
The availability of commercial gravimetric and volumetric systems for the measurement of adsorption equilibrium has seen also a growth of the use of these instruments to measure adsorption kinetics. A review of publications from the past 20 years has been used to assess common practice in 180 cases. There are worrying trends observed, such as lack of information on the actual conditions used in the experiment and the fact that the analysis of the data is often based on models that do not apply to the experimental systems used. To provide guidance to users of these techniques this contribution is divided into two parts: a discussion of the appropriate models to describe diffusion in porous materials is presented for different gravimetric and volumetric systems, followed by a structured discussion of the main trends in common practice uncovered reviewing a large number of recent publications. We conclude with recommendations for best practice to avoid incorrect interpretation of these experiments.
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