Single-Component and Binary CO2 and H2O Adsorption of Amine-Functionalized Cellulose

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• 作者：Christoph Gebald ; Jan A. Wurzbacher ; Andreas Borgschulte ; Tanja Zimmermann ; Aldo Steinfeld
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：February 18, 2014
• 年：2014
• 卷：48
• 期：4
• 页码：2497-2504
• 全文大小：328K
• ISSN：1520-5851

文摘

A fundamental analysis of single-component and binary CO₂ and H₂O adsorption of amine-functionalized nanofibrillated cellulose is carried out in the temperature range of 283鈥?53 K and at CO₂ partial pressures in the range of 0.02鈥?05 kPa, where the ultralow partial pressure range is relevant for the direct capture of CO₂ from atmospheric air. Single-component CO₂ and H₂O adsorption experimental data are fitted to the Toth and Guggenheim鈥揂nderson鈥揹e Boer models, respectively. Corresponding heats of adsorption, derived from explicit solutions of the van鈥檛 Hoff equation, are 鈭?0 kJ/mol CO₂ and 鈭?8.8 kJ/mol H₂O. Binary CO₂/H₂O adsorption measurements for humid air reveal that the presence of H₂O at 2.55 kPa enhances CO₂ adsorption, while the presence of CO₂ at 0.045 kPa does not influence H₂O adsorption. The energy demand of the temperature-vacuum-swing adsorption/desorption cycle for delivering pure CO₂ from air increases significantly with H₂O adsorption and indicates the need to reduce the hygroscopicity of the adsorbent.