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Bulletin of the Korean Chemical Society (BKCS)

ISSN 0253-2964(Print)
ISSN 1229-5949(Online)
Volume 9, Number 4
April 20, 1988 

Physical Adsorption of Nitrogen Gas on BN, Alumina, and Silica-Gel Powders
Hyun-Woo Cho, Jung-Soo Kim, Eun-Ah Yoo, Woon-Sun Ahn*
Multilayer adsorption isotherms of nitrogen on hexagonal boron nitride, γ-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.
244 - 248
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