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Probing the impact of advanced melting and advanced adsorption phenomena on the accuracy of pore size distributions from cryoporometry and adsorption using NMR relaxometry and diffusometry

Shiko, Elenica ; Edler, Karen J. LU orcid ; Lowe, John P. and Rigby, Sean P. (2012) In Journal of Colloid and Interface Science 385(1). p.183-192
Abstract

The accuracy of pore size distributions (PSD) obtained from gas adsorption and cryoporometry is compromised by the presence of advanced adsorption and advanced melting effects, respectively. In order to improve PSD accuracy, it is necessary to know the extent of such effects. In this work cryoporometry and adsorption have been combined to study the onset of advanced melting effects in a sample partially-saturated with different volumes of condensate, in turn, by pre-equilibration with different vapour pressures of adsorbate. NMR relaxometry and diffusometry have been used to independently study the size and connectivity of adsorbed liquid ganglia at different molten fractions. It has been found that the onset of significant advanced... (More)

The accuracy of pore size distributions (PSD) obtained from gas adsorption and cryoporometry is compromised by the presence of advanced adsorption and advanced melting effects, respectively. In order to improve PSD accuracy, it is necessary to know the extent of such effects. In this work cryoporometry and adsorption have been combined to study the onset of advanced melting effects in a sample partially-saturated with different volumes of condensate, in turn, by pre-equilibration with different vapour pressures of adsorbate. NMR relaxometry and diffusometry have been used to independently study the size and connectivity of adsorbed liquid ganglia at different molten fractions. It has been found that the onset of significant advanced melting coincided with abrupt changes in levels of individual pore-filling and ganglia inter-connections determined by NMR. These findings also highlighted where significant advanced adsorption processes were occurring, where larger pores were being filled with condensate before smaller pores. These studies have enabled the critical pores governing the advanced processes to be identified, and the likely errors in PSDs arising from advanced effects to be quantified.

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author
; ; and
publishing date
type
Contribution to journal
publication status
published
keywords
Adsorption, Catalyst support, Diffusion, NMR cryoporometry, Phase change, Porous media
in
Journal of Colloid and Interface Science
volume
385
issue
1
pages
10 pages
publisher
Elsevier
external identifiers
  • scopus:84865371314
ISSN
0021-9797
DOI
10.1016/j.jcis.2012.07.012
language
English
LU publication?
no
id
aa833dd5-5846-430a-be38-37b079b61cb2
date added to LUP
2023-03-31 15:03:03
date last changed
2023-03-31 15:03:03
@article{aa833dd5-5846-430a-be38-37b079b61cb2,
  abstract     = {{<p>The accuracy of pore size distributions (PSD) obtained from gas adsorption and cryoporometry is compromised by the presence of advanced adsorption and advanced melting effects, respectively. In order to improve PSD accuracy, it is necessary to know the extent of such effects. In this work cryoporometry and adsorption have been combined to study the onset of advanced melting effects in a sample partially-saturated with different volumes of condensate, in turn, by pre-equilibration with different vapour pressures of adsorbate. NMR relaxometry and diffusometry have been used to independently study the size and connectivity of adsorbed liquid ganglia at different molten fractions. It has been found that the onset of significant advanced melting coincided with abrupt changes in levels of individual pore-filling and ganglia inter-connections determined by NMR. These findings also highlighted where significant advanced adsorption processes were occurring, where larger pores were being filled with condensate before smaller pores. These studies have enabled the critical pores governing the advanced processes to be identified, and the likely errors in PSDs arising from advanced effects to be quantified.</p>}},
  author       = {{Shiko, Elenica and Edler, Karen J. and Lowe, John P. and Rigby, Sean P.}},
  issn         = {{0021-9797}},
  keywords     = {{Adsorption; Catalyst support; Diffusion; NMR cryoporometry; Phase change; Porous media}},
  language     = {{eng}},
  month        = {{11}},
  number       = {{1}},
  pages        = {{183--192}},
  publisher    = {{Elsevier}},
  series       = {{Journal of Colloid and Interface Science}},
  title        = {{Probing the impact of advanced melting and advanced adsorption phenomena on the accuracy of pore size distributions from cryoporometry and adsorption using NMR relaxometry and diffusometry}},
  url          = {{http://dx.doi.org/10.1016/j.jcis.2012.07.012}},
  doi          = {{10.1016/j.jcis.2012.07.012}},
  volume       = {{385}},
  year         = {{2012}},
}