Further Insights into Water Vapor Adsorption on Active Carbons Using Fractal Dimension Analysis

✍ Scribed by Ryoichi Tsunoda

• Publisher: Elsevier Science
• Year: 1993
• Tongue: English
• Weight: 114 KB
• Volume: 155
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1993.1033

✦ Synopsis

Adsorption amounts of water vapor (n_{0}^{F}) equivalent to the micropore volumes of active carbons are determined from the adsorption data of nitrogen and eight kinds of organic adsorbates by fractal dimension analysis using the adsorption amount (n_{0}^{\mathrm{DR}}) equivalent to the Dubinin - Radushkevich micropore volume as a function of the molar volume (v). From the plots of (L) vs (n_{\text {des }} / n_{0}^{\mathrm{F}}), where (L) and (n_{\text {des }}) are the average pore width of active carbon and the amount of water vapor adsorbed at the beginning point of the steep fall of the desorption branch, respectively, it is shown that the (n_{\text {des }} / n_{0}^{\mathrm{F}}) value becomes the minimum near the boundary between micropores and mesopores and the point of (n_{\text {des }}) is well ascribed to the micropore and mesopore structures, especially to the micropore structure as was demonstrated in the previously reported successive adsorption and desorption paths of water vapor. 1993 Academic Press, Inc.