Measurement of water vapor adsorption isotherms in mesoporous materials using the zero length column technique

Alessio Centineo, Stefano Brandani

Research output: Contribution to journalArticlepeer-review

Abstract

Measurement of water adsorption isotherms is important for industrial applications and for the 9 characterization of nanoporous materials. The zero-length column technique is used for the first 10 time to measure the adsorption-desorption isotherm of water on a mesoporous adsorbent, SBA-15, 11 up to 90 % relative humidity at 298 K. The technique showed two key advantages; a) The 12 experimental flexibility for the measurement of continuous adsorption-desorption isotherms 13 characterized by complex shapes and hysteresis loops; b) The possibility to measure a complete 14 set of adsorption-desorption isotherms and scanning curves in few days compared to several weeks 15 needed with traditional gravimetric techniques. The adsorption isotherm measured was compared 16 and validated against isotherms measured on a commercial gravimetric system designed for water 17 vapor adsorption. For the system considered, the adsorption and desorption branches are very 18 steep, and the zero-length column technique is shown to allow setting easily the starting point of 19 the scanning curves.
Original languageEnglish
Article number115417
JournalChemical Engineering Science
Volume214
Early online date10 Dec 2019
DOIs
Publication statusPublished - 16 Mar 2020

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