“Li4SiO4 supported 10wt% Ni was prepared with Li2CO3, SiO2, and NiO as the precursors by Jo et al. (Jo et al., 2022a). Its capture and methanation performance was compared to 10 wt%Ni/CaO at 550°C. The reversible reaction between Li4SiO4 and CO2 is shown in Eq. 6. With the addition of Ni, the sorbent could be regenerated at a lower temperature compared with the traditional decarbonation, as also reported for Ni/CaO DFMs. During the reduction of the carbonated Ni/Li4SiO4, the desorbed CO2 was completely converted to CH4 with a selectivity of 100%. The activity remained stable (4.53 to 4.56 mmol/g CH4) and no sign of sintering was observed after five cycles (results shown in the following figure). For Ni/CaO, even though the uptake capacity and CH4 yield were much higher than Ni/Li4SiO4 in the first cycle, they decreased significantly and became even worse than Ni/Li4SiO4 in the working capacity.(6)Li4SiO4 + CO2 ↔ Li2SiO3 + Li2CO3 ” (https://doi.org/10.1016/j.ccst.2022.100052)
Figure data – (a) CO2 capture capacity and CH4 productivity using Ni/CaO and Ni/LS; molar flow rate of CO2 and CH4 of (b) Ni/CaO and (c) Ni/LS (https://doi.org/10.1016/j.fuel.2021.122602)
The comparison of ICCU results with other work is indicated below (https://doi.org/10.1016/j.fuel.2021.122602):