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Measuring adsorption isotherms with a flowmeter and a pressure gauge

Authors
  • Vallejos-Burgos, Fernando1, 2
  • Kaneko, Katsumi1
  • 1 Shinshu University, Center for Energy and Environmental Science, Wakasato, Nagano, 380-8553, Japan , Wakasato (Japan)
  • 2 Carbon Science Centre of Excellence, Morgan Advanced Materials, 310 Innovation Blvd., Suite 250, State College, PA, 16803, USA , State College (United States)
Type
Published Article
Journal
Adsorption
Publisher
Springer US
Publication Date
Apr 02, 2019
Volume
25
Issue
4
Pages
809–817
Identifiers
DOI: 10.1007/s10450-019-00068-8
Source
Springer Nature
Keywords
License
Yellow

Abstract

We revisit the quasi-equilibrium adsorption method as an inexpensive alternative to commercial volumetric apparatus for the measurement of gas adsorption isotherms. This method is based on how the pressure of a manifold containing the sample increases as a function of time when an adsorbing gas is introduced. We show that, under certain conditions, it is not necessary to employ ultra-low flow rates (i.e. below few cm3/h) to obtain reliable adsorption isotherms. Also, we show that by time-differentiating the mass balance equation, it is possible to obtain and measure directly the rates of adsorption. These new insights provide a low-cost and simple approach to the measurements of both adsorption equilibrium and rates.

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