Imperial College London
Alternate

DrRonnyPini

Faculty of Engineering, Department of Chemical Engineering

Reader in Chemical Engineering
 
 
 
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Contact

 

+44 (0)20 7594 7518r.pini Website

 
 
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Location

 

415ACE ExtensionSouth Kensington Campus

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Summary

 

Publications

Citation

BibTex format

@article{Pini:2014:10.1016/j.micromeso.2013.12.005,
author = {Pini, R},
doi = {10.1016/j.micromeso.2013.12.005},
journal = {Microporous and Mesoporous Materials},
pages = {40--52},
title = {Interpretation of net and excess adsorption isotherms in microporous adsorbents},
url = {http://dx.doi.org/10.1016/j.micromeso.2013.12.005},
volume = {187},
year = {2014}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Adsorption data are routinely reported as net or excess amounts adsorbed; although measuring techniques are nowadays well established, the interpretation and further use of these two measures is limited by the uncertainty on the estimated internal pore volume of the material and, accordingly, the volume (or density) of the adsorbed fluid. In this study, adsorption data are presented that have been measured with CO2 on 13X zeolite in both crystal and pellet forms at 50 °C and in the pressure range 0.02–14 MPa by using a magnetic suspension balance. The adsorbents’ structural parameters have been obtained through a combination of independent measuring techniques, including low-pressure adsorption and mercury intrusion porosimetry, and a methodology is presented where both net and excess adsorption isotherms are simultaneously evaluated through a graphical method. While providing additional insights on the meaning of these two different frameworks, the application of such an integrated approach allows for a more consistent interpretation of the obtained adsorption data. It is shown that for both materials the adsorption process is entirely controlled by the filling of the micropores and that the adsorbent’s volume is overestimated when helium is used as a probing gas. The statistical adsorption isotherm model proposed by Ruthven is applied to describe the measured adsorption isotherms and provides a much better fit than the Langmuir model. For both crystals and pellets, and over the whole pressure range, CO2 adsorbs as a dense liquid with density values starting from the critical density of the fluid and reaching 27 mol/L (i.e. 15 molecules/cage) at the highest pressure of the experiment.
AU  - Pini,R
DO  - 10.1016/j.micromeso.2013.12.005
EP  - 52
PY  - 2014///
SN  - 1387-1811
SP  - 40
TI  - Interpretation of net and excess adsorption isotherms in microporous adsorbents
T2  - Microporous and Mesoporous Materials
UR  - http://dx.doi.org/10.1016/j.micromeso.2013.12.005
UR  - http://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcApp=PARTNER_APP&SrcAuth=LinksAMR&KeyUT=WOS:000331674200006&DestLinkType=FullRecord&DestApp=ALL_WOS&UsrCustomerID=1ba7043ffcc86c417c072aa74d649202
UR  - https://www.sciencedirect.com/science/article/abs/pii/S1387181113006100?via%3Dihub
VL  - 187
ER  -
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