Journal
CHEMICAL ENGINEERING SCIENCE
Volume 214, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ces.2019.115417
Keywords
Water adsorption; Hysteresis loop; Scanning curves; Zero length column; Equilibrium
Categories
Funding
- University of Edinburgh
- PSE Ltd
- Energy Technologies Partnership
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Measurement of water adsorption isotherms is important for industrial applications and for the characterization of nanoporous materials. The zero-length column technique is used for the first time to measure the adsorption-desorption isotherm of water on a mesoporous adsorbent, SBA-15, up to 90% relative humidity at 298 K. The technique showed two key advantages; (a) The experimental flexibility for the measurement of continuous adsorption-desorption isotherms characterized by complex shapes and hysteresis loops; (b) The possibility to measure a complete set of adsorption-desorption isotherms and scanning curves in few days compared to several weeks needed with traditional gravimetric techniques. The adsorption isotherm measured was compared and validated against isotherms measured on a commercial gravimetric system designed for water vapor adsorption. For the system considered, the adsorption and desorption branches are very steep, and the zero-length column technique is shown to allow setting easily the starting point of the scanning curves. (C) 2019 Elsevier Ltd. All rights reserved.
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