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{Ansari:2020:10.1016/j.micromeso.2020.110537,
author = {Ansari, H and Joss, L and Hwang, J and Trusler, J and Maitland, G and Pini, R},
doi = {10.1016/j.micromeso.2020.110537},
journal = {Microporous and Mesoporous Materials},
title = {Supercritical adsorption in micro- and meso-porous carbons and its utilisation for textural characterisation},
url = {http://dx.doi.org/10.1016/j.micromeso.2020.110537},
volume = {308},
year = {2020}
}
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RIS format (EndNote, RefMan)

TY  - JOUR
AB  - Understanding supercritical gas adsorption in porous carbons requires consistency between experimental measurements at representative conditions and theoretical adsorption models that correctly account for the solid’s textural properties. We have measured unary CO2 and CH4 adsorption isotherms on a commercial mesoporous carbon up to 25 MPa at 40 °C, 60 °C and 80 °C. The experimental data are successfully described using a model based on the lattice Density Functional Theory (DFT) that has been newly developed for cylindrical pores and used alongside Ar (87K) physisorption to extract the representative pore sizes of the adsorbent. The agreement between model and experiments also includes important thermodynamic parameters, such as Henry constants and the isosteric heat of adsorption. The general applicability of our integrated workflow is validated by extending the analysis to a comprehensive literature data set on a microporous activated carbon. This comparison reveals the distinct pore-filling behaviour in micro- and mesopores at supercritical conditions, and highlights the limitations associated with using slit-pore models for the characterisation of porous carbons with significant amounts of mesoporosity. The lattice DFT represents a departure from simple adsorption models, such as the Langmuir equation, which cannot capture pore size dependent adsorption behaviour, and a practical alternative to molecular simulations, which are computationally expensive to implement.
AU  - Ansari,H
AU  - Joss,L
AU  - Hwang,J
AU  - Trusler,J
AU  - Maitland,G
AU  - Pini,R
DO  - 10.1016/j.micromeso.2020.110537
PY  - 2020///
SN  - 1387-1811
TI  - Supercritical adsorption in micro- and meso-porous carbons and its utilisation for textural characterisation
T2  - Microporous and Mesoporous Materials
UR  - http://dx.doi.org/10.1016/j.micromeso.2020.110537
UR  - http://hdl.handle.net/10044/1/82185
VL  - 308
ER  -
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