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Adsorption

Erschienen in:

02.04.2019

Measuring adsorption isotherms with a flowmeter and a pressure gauge

Observations on the quasi-equilibrium method

verfasst von: Fernando Vallejos-Burgos, Katsumi Kaneko

Erschienen in: Adsorption | Ausgabe 4/2019

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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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Titel: Measuring adsorption isotherms with a flowmeter and a pressure gauge
Observations on the quasi-equilibrium method
verfasst von: Fernando Vallejos-Burgos
Katsumi Kaneko
Publikationsdatum: 02.04.2019
Verlag: Springer US
Erschienen in: Adsorption / Ausgabe 4/2019
Print ISSN: 0929-5607
Elektronische ISSN: 1572-8757
DOI: https://doi.org/10.1007/s10450-019-00068-8

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