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Adsorption

pp 1–9 | Cite as

Measuring adsorption isotherms with a flowmeter and a pressure gauge

Observations on the quasi-equilibrium method
  • Fernando Vallejos-BurgosEmail author
  • Katsumi Kaneko
Article
  • 78 Downloads

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.

Keywords

Quasi-equilibrium adsorption Flow adsorption Adsorption rate Hopcalite Activated carbon fibers Molecular sieves 

Notes

Acknowledgements

We appreciate the suggestions provided by Dr. Jacek Jagiełło from Micromeritics Instruments Corp and from Dr. Carlos León y León from Morgan Advanced Materials.

Supplementary material

10450_2019_68_MOESM1_ESM.pdf (738 kb)
Supplementary material 1 (PDF 738 KB)

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© Springer Science+Business Media, LLC, part of Springer Nature 2019

Authors and Affiliations

  1. 1.Center for Energy and Environmental ScienceShinshu UniversityWakasatoJapan
  2. 2.Morgan Advanced MaterialsCarbon Science Centre of ExcellenceState CollegeUSA

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