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Decoding gas-solid interaction effects on adsorption isotherm shape: I. Non-polar adsorptives
journal contribution
posted on 2018-01-23, 11:28 authored by S. Hadi Madani, Philip Kwong, Francisco Rodriguez-Reinoso, Mark Biggs, Phillip PendletonA suite of non-polar adsorptives of different kinetic diameters and shape were used to determine adsorption and pore filling mechanism of a well-characterised poly(furfuryl alcohol)-based activated carbon. Triplicate measured Type I adsorption isotherms for each adsorptive were averaged to provide standard deviation in relative pressures and associated amounts adsorbed. Plateau amounts adsorbed for N2, Ar, CH4, and C6H6, provided Gurvitsch volumes averaged to 0.368 ± 0.015 cm3(liq)/g. The calculated Gurvitsch volumes were compared with those derived via the Dubinin-Radushkevich (DR) equation. Additional adsorptives were CO2, iso-butane and SF6. The results of these 7 adsorptives were used to qualitatively analyse and decode a micropore filling adsorption mechanism. The DR equation was also used for further analysis of the pore filling mechanism. Based on the adsorbate-adsorbate and adsorbate-adsorbent interactions, adsorbates were classified into three groups: (a) Non-polar with non-specific interactions (no dipole, no quadrupole, not readily polarizable: Ar, N2, CH4 and iso-butane), adsorbing as a continuous uptake over the observed relative pressure range; (b) Non-polar adsorptives with potential for specific interactions (no dipole, quadrupole moment: CO2 and C6H6), adsorbing as a condensation process over a relatively narrow relative pressure range in a medium pressure range; (c) Halogenated adsorptives (no dipole, no quadrupole, polarizable: SF6), adsorbing with an S-shaped uptake extending over a relatively broad relative pressure range.
Funding
The authors thank the Australian Research Council discovery program (DP110101293) for funding support and S.H.M also thanks the University of South Australia for a postgraduate research scholarship.
History
School
- Science
Department
- Chemistry
Published in
Microporous and Mesoporous MaterialsCitation
MADANI, S.H. ...et al., 2018. Decoding gas-solid interaction effects on adsorption isotherm shape: I. Non-polar adsorptives. Microporous and Mesoporous Materials, 264, pp. 76–83.Publisher
© ElsevierVersion
- AM (Accepted Manuscript)
Publisher statement
This work is made available according to the conditions of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International (CC BY-NC-ND 4.0) licence. Full details of this licence are available at: https://creativecommons.org/licenses/by-nc-nd/4.0/Acceptance date
2018-01-09Publication date
2018Notes
This paper was published in the journal Microporous and Mesoporous Materials and the definitive published version is available at https://doi.org/10.1016/j.micromeso.2018.01.010.ISSN
1387-1811Publisher version
Language
- en