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Journal of Sol-Gel Science and Technology

, Volume 32, Issue 1–3, pp 53–56 | Cite as

Organically-Modified Silica Xerogels for Adsorption of CH4 at 298 K

  • R. M. A. MaCgibbon
  • R. Badheka
  • P. A. Sermon
Article

Abstract

Organic tethers have been incorporated into acid- and base-catalysed silica sol–gels. The surface area is modified by this insertion suggesting an interaction at a molecular level. The HCl-catalysed SiO2 sol–gel had its relative extent of adsorption at 298 K of CH4 relative to H2O:
  1. (i)

    depressed by the addition of 5% bis(triethoxysilyl)methane

     
  2. (ii)

    increased by the addition of 5% bis(trimethoxysilyl)hexane

     
which attributed the tether hydrophilic-lipophilic balance (HLB). The reasons for this unexpected physical adsorption of CH4 at a temperature far above its boiling point are now being explored, along with the potential of these materials for selective hydrocarbon sensors and separators.

Keywords

CH4 adsorption silica xerogels organic modifiers 

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Copyright information

© Kluwer Academic Publishers 2004

Authors and Affiliations

  • R. M. A. MaCgibbon
    • 1
  • R. Badheka
    • 1
  • P. A. Sermon
    • 1
  1. 1.Chemistry, School of Biomedical and Molecular SciencesUniversity of SurreySurreyUK

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