Kinetics of the total and reversible adsorption of propylene and propane on zeolite 4A (CECA) at different temperatures

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• 作者：Patiñ ; o-Iglesias ; M.E. ; Aguilar-Armenta ; G. ; Jimé ; nez-L&oacute ; pez ; A. ; Rodrí ; guez-Castell&oacute ; n ; E.
• 关键词：Zeolite 4A ; Propylene ; Propane ; Adsorption kinetics ; Isosteric heat of adsorption
• 刊名：Colloids and Surfaces A ; Physicochemical and Engineering Aspects
• 出版年：2004
• 期刊代码：22_09277757
• 类别：ch
• 出版时间：April 20, 2004
• 卷：237
• 期：1-3
• 页码：73-77
• 文件大小：117 K

摘要

The kinetics of adsorption of pure propylene (C₃H₆) and propane (C₃H₈) on a commercial zeolite sample 4A (CECA), provided by the company CECA, has been measured in the temperature range of 20–185°C using a high-vacuum volumetric glass device. For temperatures below the critical temperature of C₃H₆ (<92°C), especially at 20°C and with long contact times, a certain amount of irreversibly adsorbed C₃H₆ was observed, whereas for temperatures above the critical temperature the irreversibly adsorbed amount of propylene was extremely small. The isosteric heat of adsorption for C₃H₆ was also evaluated. Unlike the C₃H₆, the adsorbed amount of C₃H₈ on the 4A (CECA) sample at low and high temperatures was negligible and totally reversible. These results allow the assumption that this sample could be an excellent adsorbent for the molecular sieve separation of C₃H₆/C₃H₈ mixtures in the temperature range of 150–185°C.