Chemical Sorption of Carbon Dioxide (CO₂) on Lithium Oxide (Li₂O)

Abstract

The behavior of lithium oxide (Li2O) under an atmosphere of CO2 was studied using thermogravimetric analysis, scanning electron microscopy, and X-ray diffraction techniques. Results show that Li2O can be used for CO2 retention. It is a better absorbent than other lithium ceramics. A chemisorption topochemical reaction is proposed to explain the sorption of CO2. The kinetic parameters were obtained. First, the CO2 sorption is controlled by a first-order reaction. Later, CO2 sorption depends on the diffusion of lithium through the formed shell of Li2CO3, with an extraordinary increase of the diffusion at 600 °C, due to an unusual increase of lithium mobility.

Lithium Cuprate (Li2CuO2): A New Possible Ceramic Material for CO2 Chemisorption

“…where the reaction is similar to those observed for other lithium ceramics, [1][2][3][4][5][6]8 in which lithium carbonate is produced in addition to a residual oxide, CuO in this case. For this reaction, the theoretical capacity is corresponds 0.412 g CO2 /g Li2CuO2 .…”

“…[6][7][8][9][10][11][12][13] In general, all these materials show a similar chemisorption mechanism. First, CO 2 reacts over the ceramic particle surface, producing a lithium carbonate (Li 2 CO 3 ) external shell and the corresponding residual oxide.…”

“…Then, in order to continue the CO 2 chemisorption, lithium atoms have to diffuse from the core of the particles toward the surface to complete the reaction. 6 Additionally, it has been proposed that one of the most important steps, and perhaps the limiting one, of the whole process is the diffusion. On the other hand, lithium cuprate (Li 2 CuO 2 ) has been used for different electrical applications such as cathodes for lithium batteries and as a superconductor material, owing to the excellent lithium diffusion.…”

Preparation and kinetic analysis of Li4SiO4 sorbents with different silicon sources for high temperature CO2 capture

“…Hence, the materials with high CO 2 capture capacity at high temperature are desirable. In recent years, the development of regenerable sorbents for high temperature CO 2 capture has received increasing attention [5][6][7]. Compared with other sorbents, Li 4 SiO 4 has the better CO 2 absorption properties over a wide range of temperature and CO 2 concentration [8,9].…”

Low Temperature Synthesis of Li2SiO3: Effect on Its Morphological and Textural Properties

“…Thus, for example, there has been research in recent years on their application as electronic devices, as CO 2 captors and as breeder materials for nuclear fusion reactors, in addition to other more well-known applications such as in batteries and in low thermal expansion glassceramics used in ceramic hobs [1][2][3][4][5][6][7][8][9][10]. Among these ceramics, lithium silicates (Li 2 SiO 3 and Li 4 SiO 4 ) seem to present very good properties as materials in nuclear research as tritium ( 3 T) breeding materials and as materials to absorb carbon dioxide [11][12][13][14][15][16][17][18].…”