Bulletin of the Korean Chemical Society

Korean Chemical Society (대한화학회)
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Physical Adsorption of Nitrogen Gas on BN, Alumina, and Silica-Gel Powders

  • Cho, Hyun-Woo (Department of Chemistry, Sung Kyun Kwan University) ;
  • Kim, Jung-Soo (Department of Chemistry, Sung Shin Women's Unviersity) ;
  • Yoo, Eun-Ah (Department of Chemistry, Sung Shin Women's Unviersity) ;
  • Ahn, Woon-Sun (Department of Chemistry, Sung Kyun Kwan University)
  • Published : 1988.08.20
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Abstract

Multilayer adsorption isotherms of nitrogen on hexagonal boron nitride, ${\gamma}$-alumina, and silica-gel powders are determined at the liquid nitrogen temperature using a gravimetric adsorption apparatus. The volume (V) of the adsorbed gas are plotted against the statistical thickness(t) of the adsorbed layer, and the t-method area are calculated from the slope of these V-t plots to compare with the BET area. A number of universal adsorption isotherms and the Frenkel-Halsey-Hill equation are used one after another in calculating the statistical thickness. The appropriateness of the FHH equation as an universal adsorption isotherm is discussed finally.

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References

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