Analysis of the CO2鈥揌2O Chemisorption in Lithium Silicates at Low Temperatures (30鈥?0 掳C)

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• 作者：Brenda Alc谩ntar-V谩zquez ; Pablo R. D铆az Herrera ; Alejandro Barrera Gonz谩lez ; Yuhua Duan ; Heriberto Pfeiffer
• 刊名：Industrial & Engineering Chemistry Research
• 出版年：2015
• 出版时间：July 15, 2015
• 年：2015
• 卷：54
• 期：27
• 页码：6884-6892
• 全文大小：560K
• ISSN：1520-5045

文摘

Li₈SiO₆ and Li₄SiO₄ were synthesized by a solid-state reaction. Then, dynamic and isothermal thermogravimetric water vapor sorption experiments were performed using two carrier gases: N₂ and CO₂. Initially, the Li₈SiO₆鈥揌₂O鈥?N₂ or CO₂) systems were analyzed. It was evidenced that Li₈SiO₆ can trap water physically and chemically, producing Li鈥揙H superficial species. When CO₂ was used as the carrier gas, Li₈SiO₆ continued chemisorbing H₂O but CO₂ was trapped as well, forming Li₂CO₃ and Li₄SiO₄ as secondary phases. On the basis of these results, the Li₄SiO₄鈥揌₂O鈥揅O₂ system was also analyzed. The experimental results and different theoretical thermodynamic calculations confirmed that Li₈SiO₆ can chemisorb 2 moles of CO₂ per mole of ceramic at a low temperature range (30鈥?0 掳C). Finally, different CO₂ chemisorption kinetic experiments were performed to analyze and quantify the trapped CO₂.