Preparation of Novel Li4SiO4 Sorbents with Superior Performance at Low CO2 Concentration

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• 作者：Xinwei Yang ; Dr. Wenqiang Liu ; Jian Sun ; Yingchao Hu ; Wenyu Wang ; Hongqiang Chen ; Yang Zhang ; Xian Li and Prof. Minghou Xu
• 刊名：ChemSusChem
• 出版年：2016
• 出版时间：July 7, 2016
• 年：2016
• 卷：9
• 期：13
• 页码：1607-1613
• 全文大小：1737K
• ISSN：1864-564X

文摘

This work produced Li₄SiO₄ sorbents through an impregnated-suspension method to overcome its typical poor performance at low CO₂ concentrations. A SiO₂ colloidal solution and two different organic lithium precursors were selected. A bulgy surface morphology (and thus, the significantly enlarged reacting surface area) was obtained for Li₄SiO₄, which contributed to the high absorption capacity. As a result, the capacity in cyclic tests at 15 vol % CO₂ was approximately 8 times higher than conventional Li₄SiO₄ prepared through a solid-state reaction. The phenomenon of a progressively increasing capacity (i.e., sustainable usage) was observed over the 40 cycles investigated, and this increasing trend continued to the last cycle. Correspondingly, over the course of the multicycle absorption/ desorption processes, the sorbents evolve from lacking porosity to having a high number of micron-sized pores.