Regenerable sodium-based lithium silicate sorbents with a new mechanism for CO2 capture at high temperature

• Published in: Renewable energy Vol. 144; pp. 180 - 187
• Main Authors: Kwon, Yong Mok, Lee, Soo Chool, Chae, Ho Jin, Cho, Min Sun, Park, Yong Ki, Seo, Hwi Min, Chang Kim, Jae
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.12.2019
• Subjects: CO2 capture; Li2SiO3; Li3NaSiO4; Li4SiO4; Solid sorbent; Li4SiO4; Li2SiO3; Solid sorbent; CO2 capture; Li3NaSiO4
• ISSN: 0960-1481; 1879-0682
• DOI: 10.1016/j.renene.2018.08.039

Recently, lithium-ion batteries have become widespread as a source of power or energy for everything from portable electronics to electric vehicles. As a result, the consumption of lithium is rapidly increasing, accompanied by an increase in its price. This study reports the synthesis of a regenerable sodium-based lithium silicate solid sorbent that uses less lithium than Li4SiO4 solid sorbents. The regenerable sodium-based lithium silicate solid sorbent was prepared by mixing LiOH with a sodium silicate solution in a 2:1 M ratio, which steadily maintained its CO2 capture capacity during multiple cycles. In addition to Li4SiO4 present in the developed solid sorbent, we attribute CO2 sorption and regeneration to a new structure, namely Li3NaSiO4. Notably, the LONS2 solid sorbent exhibits a faster CO2 sorption rate than that of the Li4SiO4 sorbent. Moreover, the LONS2 solid sorbent containing both Li3NaSiO4 and Li4SiO4 phases has potential for CO2 capture at high temperature. •A sorbent containing Li3NaSiO4 and Li4SiO4 was developed for CO2 capture.•The sorbent was prepared by mixing LiOH with Na2SiO4 solution in a 2:1 M ratio.•Li3NaSiO4 was contributed to CO2 capture at high temperature.•Li3NaSiO4 is the primary active material in the sorbent.