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Adsorption
Erschienen in: Adsorption 1/2012

01.02.2012

Pure and binary adsorption of CO2, H2, and N2 on activated carbon

verfasst von: Johanna Schell, Nathalie Casas, Ronny Pini, Marco Mazzotti

Erschienen in: Adsorption | Ausgabe 1/2012

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Abstract

A new developing field of application for pressure swing adsorption (PSA) processes is the capture of CO2 to mitigate climate change, especially the separation of CO2 and H2 in a pre-combustion context. In this process scheme the conditions of the feed to the separation step, namely a pressure of 3.5 to 4.5 MPa and a CO2 fraction of around 40% are favorable for an adsorption based separation process and make PSA a promising technology. Among the commercial adsorbent materials, activated carbon is most suitable for this application. To evaluate the potential, to benchmark new materials, and for process development a sound basis of the activated carbon thermodynamic data is required, namely equilibrium adsorption isotherms of the relevant pure components and mixtures, Henry’s constants and isosteric heats.
In this work pure adsorption equilibria of CO2, H2 and N2 on commercial activated carbon (AP3-60 from Chemviron, Germany) are measured using a Rubotherm Magnetic Suspension Balance (MSB) (Bochum, Germany) in a wide temperature and pressure range. The data is used to fit the temperature dependent parameters of Langmuir and Sips (Langmuir-Freundlich) isotherms and to determine the Henry’s constants as well as isosteric heats. Based on this evaluation different methods to evaluate the data are compared and discussed. With the pure isotherm parameters of the Sips isotherm binary adsorption is predicted using an empirical binary Sips equation and ideal adsorbed solution theory (IAST). The results are compared to binary measurements in the same MSB applying a gravimetric-chromatographic method.
Vorheriger Artikel The Pickett equation analytical continuation

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Metadaten
Titel
Pure and binary adsorption of CO2, H2, and N2 on activated carbon
verfasst von
Johanna Schell
Nathalie Casas
Ronny Pini
Marco Mazzotti
Publikationsdatum
01.02.2012
Verlag
Springer US
Erschienen in
Adsorption / Ausgabe 1/2012
Print ISSN: 0929-5607
Elektronische ISSN: 1572-8757
DOI
https://doi.org/10.1007/s10450-011-9382-y

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