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Preparation of Novel Li 4 SiO 4 Sorbents with Superior Performance at Low CO 2 Concentration
Author(s) -
Yang Xinwei,
Liu Wenqiang,
Sun Jian,
Hu Yingchao,
Wang Wenyu,
Chen Hongqiang,
Zhang Yang,
Li Xian,
Xu Minghou
Publication year - 2016
Publication title -
chemsuschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.412
H-Index - 157
eISSN - 1864-564X
pISSN - 1864-5631
DOI - 10.1002/cssc.201501699
Subject(s) - materials science , desorption , suspension (topology) , chemical engineering , absorption capacity , absorption (acoustics) , porosity , lithium (medication) , adsorption , colloid , specific surface area , chemistry , catalysis , organic chemistry , composite material , medicine , mathematics , homotopy , pure mathematics , engineering , endocrinology
This work produced Li 4 SiO 4 sorbents through an impregnated‐suspension method to overcome its typical poor performance at low CO 2 concentrations. A SiO 2 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 Li 4 SiO 4 , which contributed to the high absorption capacity. As a result, the capacity in cyclic tests at 15 vol % CO 2 was approximately 8 times higher than conventional Li 4 SiO 4 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.