Solution combustion synthesis derived Li4SiO4 for post-combustion carbon capture

Lithium-based sorbents are considered as promising candidates for post-combustion carbon capture because of their superior stability compared to CaO. In the present study, Li4SiO4 powders were synthesized by Solution Combustion Synthesis (SCS) technique using LiNO3 as lithium source, TEOS as silicon source and citric acid as the fuel. CO2 sorption tests were carried out for the synthesized samples and, powder prepared at 650 degrees C during 4 h, which has 17 mu m of particle size, 5.2 m(2) g(-1) of specific surface area, 85.2% Li4SiO4 phase purity with 97 nm of crystallite size showed a sorption performance as 29.5 wt% CO2 uptake value, in thermobalance test under 92 vol% CO2 (N-2 balance) gas concentration at 600 degrees C. The sample had a CO2 uptake value of 21.4 wt% under 20 vol% CO2 concentration which was chosen to simulate industrial off-gas conditions. Also, the same sample showed a good cyclic durability during the sorption/desorption tests. The sample maintained its cyclic CO2 uptake capability range between 21 and 24 wt% for 15 cycles.