CO2 capture by Li4SiO4 sorbents and their applications: Current developments and new trends

Kinetics of the Carbonation Reaction of Lithium Orthosilicate Using a Typical CO2 Concentration of Combustion Gases

“…are included in another group of CO 2 sorbents suitable for high temperatures and greatly studied in recent years 10,13,14 . Among these, lithium containing materials such as lithium zirconate (Li 2 ZrO 3 ) and lithium orthosilicate (Li 4 SiO 4 ) seem to be promising CO 2 acceptors in the temperature range of 450-700 o C, being the Li 4 SiO 4 the most reactive [15][16][17][18][19] . The CO 2 uptake on Li 4 SiO 4 is almost 50 wt.% greater than the weight change for Li 2 ZrO 3 13,20 .…”

“…According to Amorim et al (2016) 24 , the advantages of Li 4 SiO 4 also include the fast carbonation and decarbonation kinetics, the use in 48-repeated reaction cycles, as well as the good mechanical properties. In general, a higher concentration of CO 2 is beneficial for the CO 2 sorption of Li 4 SiO 4 sorbents 17,25,26 . Still, the sorption performance of Li 4 SiO 4 sorbents decays with the decrease of CO 2 concentration and the suitable temperature to the desorption process depends on the CO 2 concentration 16 17,29 .…”

“…In general, a higher concentration of CO 2 is beneficial for the CO 2 sorption of Li 4 SiO 4 sorbents 17,25,26 . Still, the sorption performance of Li 4 SiO 4 sorbents decays with the decrease of CO 2 concentration and the suitable temperature to the desorption process depends on the CO 2 concentration 16 17,29 . It is known that the CO 2 concentration in flue gases depends on the fuel such as coal (12-15 vol.%CO 2 ) and natural gas (3-4 vol.%CO 2 ), and the effect of CO 2 concentration in the sorption performance of Li 4 SiO 4 should be deeply studied.…”

“…,26 .From the viewpoint of kinetics, the diffusion of Li 2 O on the sorbent surface has been considered as the rate-limiting step at higher CO 2 concentrations, while the superficial sorption becomes the rate-limiting step for lower CO 2 concentrations17,27,28 .Despite these findings, tests of Li 4 SiO 4 sorbent performance under realistic conditions (temperature, CO 2 concentration, pressure, flow rate, etc.) and apparatus are scarcely reported in the literature…”

Equilibrium and Kinetic Study of Ammonium Sorption by Raphia farinifera

“…An alternative to commonly used techniques is sorption of ammonia on a properly selected sorbent. The sorbent should meet a number of requirements: be easily accessible and durable both mechanically and chemically, have high sorption capacity and high affinity for analyte, and enable recycling by lowering process costs (Veliscek-Carolan et al 2019;Azimi et al 2019;Bhardwaj and Bhaskarwar 2018;Hu et al 2019).…”