The role of nickel addition on the CO2 chemisorption enhancement in Ni-containing Li2CuO2: Analysis of the cyclability and different CO2 partial pressure performance

CO2 Capture at Medium to High Temperature Using Solid Oxide-Based Sorbents: Fundamental Aspects, Mechanistic Insights, and Recent Advances

“…488 Further studies synthesizing a 10% Ni-doped Li 2 CuO 2 material found the solid-solution phase to have cyclic stability and regeneration rate superior to that of the pristine material, suggesting that the formation of an inert secondary NiO phase during carbonation aids oxygen transport. 671 Finally it should be noted that concepts of ionic conduction are still relevant for the CaO−CaCO 3 and MgO−MgCO 3 systems, although more consideration is given to carbonate ion mobility. Ionic conduction in this context is explored in earlier sections which focus on modification of CaO-and MgO-based sorbents with molten alkali metal salt promoters (section 3.1.1 on alkali doping in CaO and section 3.2 where the promoter is proposed to facilitate the dissolution of MgO).…”

“…A strategy of promoting Li 4 SiO 4 with NdNO 3 improved the resulting sorbent’s performance through the formation of an inert Nd 2 O 3 network to avert sintering at high temperatures . Further studies synthesizing a 10% Ni-doped Li 2 CuO 2 material found the solid-solution phase to have cyclic stability and regeneration rate superior to that of the pristine material, suggesting that the formation of an inert secondary NiO phase during carbonation aids oxygen transport . Finally it should be noted that concepts of ionic conduction are still relevant for the CaO–CaCO 3 and MgO–MgCO 3 systems, although more consideration is given to carbonate ion mobility.…”

Evaluation of Me-Li2CuO2 Solid Solutions (Where Me = Ni, Fe, and Mn) during CO2 and CO Chemisorption

“…The best chemisorption was observed at 650 °C reaching 34 wt %, although it showed lower CO 2 captures at 700 and 750 °C, compared with pristine and other Me-Li 2 CuO 2 samples (Figure ). The best values reported for pristine, 7.5Ni-Li 2 CuO 2 , and 5Fe-Li 2 CuO 2 were reported at 750 °C, reaching 33, 33.7, and 34.1 wt %, respectively. Based on these results, it can be concluded that 5Mn-Li 2 CuO 2 needs less temperature (energy) to reach its maximum CO 2 capture efficiency, while 5Ni-Li 2 CuO 2 showed a stable and maximum capture at around 700 °C and 5Fe-Li 2 CuO 2 needs more energy to achieve its best CO 2 chemisorption conditions.…”

“…Additionally, Li 2 CuO 2 can be modified to form solid solutions or composites, modifying some of its characteristics. − Copper ions can change its oxidation state releasing oxygen, which increases CO 2 and CO capture properties, , in comparison to other alkaline ceramics, such as Li 4 SiO 4 or Na 2 ZrO 3 , where Si and Zr are not able to modify their oxidation states. Based on that, the goal of this work was to analyze the partial substitution of the copper ions on Li 2 CuO 2 for other transition metals, to obtain solid solutions and to study their effects on CO 2 chemisorption and CO oxidation–chemisorption processes.…”

Unveiling the different physicochemical properties of M-doped β-NaFeO2 (where M = Ni or Cu) materials evaluated as CO2 sorbents: a combined experimental and theoretical analysis

“…In a different study, Li 2 CuO 2 was doped with nickel, and CO 2 chemisorption significantly increased, as compared to the pristine sample. 25 The higher CO 2 capture efficiency was associated with an improvement of lithium and oxygen diffusion processes induced by the cation substitution.…”