Yang Xinwei, Liu Wenqiang, Sun Jian, Hu Yingchao, Wang Wenyu, Chen Hongqiang, Zhang Yang, Li Xian, Xu Minghou
State Key Laboratory of Coal Combustion, School of Energy and Power Engineering, Huazhong University of Science and Technology, 1037 Luoyu Road, Wuhan, 430074, China.
ChemSusChem. 2016 Jul 7;9(13):1607-13. doi: 10.1002/cssc.201501699. Epub 2016 Jun 17.
This work produced Li4 SiO4 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 Li4 SiO4 , 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 Li4 SiO4 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.
这项工作通过浸渍悬浮法制备了硅酸锂（Li4SiO4）吸附剂，以克服其在低二氧化碳浓度下典型的不佳性能。选择了一种二氧化硅胶体溶液和两种不同的有机锂前驱体。硅酸锂呈现出凸起的表面形态（因此，反应表面积显著增大），这有助于提高吸附容量。结果，在15体积%二氧化碳浓度下的循环测试中，其容量比通过固态反应制备的传统硅酸锂高出约8倍。在所研究的40个循环中观察到容量逐渐增加（即可持续使用）的现象，并且这种增加趋势持续到最后一个循环。相应地，在多循环吸附/解吸过程中，吸附剂从缺乏孔隙发展到具有大量微米级孔隙。
