Gas Adsorption on Silicalite

✍ Scribed by T.C. Golden; S. Sircar

• Book ID: 102578641
• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 239 KB
• Volume: 162
• Category: Article
• ISSN: 0021-9797
• DOI: 10.1006/jcis.1994.1023

✦ Synopsis

Isotherms for adsorption of (\mathrm{H}{2}, \mathrm{CH}{4}, \mathrm{~N}{2}, \mathrm{CO}, \mathrm{Ar}, \mathrm{CO}{2}), and (\mathrm{Kr}) were measured at two temperatures (\left(\sim 32.0\right.) and (\sim 69.0^{\circ} \mathrm{C}) ) over a pressure range of (0-18.0 \mathrm{~atm}) on silicalite. The isosteric lieats of adsorption for these gases at the limit of zero coverage increased as the polarizability of the adsorbate increased. An enhancement in the heat was introduced for (\mathrm{CO}{2}, \mathrm{CO}), and (\mathrm{N}{2}) adsorption due to the presence of permanent poles in these gases. All isotherms were Type I, but the Henry's Law constants and the overall shapes were very different for the gases. The homogeneous multisite Langmuir model described the isotherms very well. The variations in isosteric heats of adsorption as functions of adsorbate loadings were very small for all gases, indicating that silicalite was an energetically homogeneous adsorbent for the adsorption of these gases. 1994 Acadenic Press. Inc.