Different sorbents had been investigated using Ru as catalytic sites for ICCU-methanation. As shown in the following figure, the profile of methane production is similar. However, Na2O and CaO based DFMs had a high yield of CH4. It is noted that this yield (~0.6 mmol/g) is quite low, considering the capacity of CaO.
https://doi.org/10.1016/j.jcou.2019.03.009
The TGA analysis indicated the capacity and kinetics of methane formation. Although CaO showed a relatively high capacity of CO2 capture, its hydrogenation for CH4 production was quite slow (335 min for completion), while Na2O based DFMs only needed 36 for the complete hydrogenation. In addition, Na2O based DMFs demonstrated a better performance compared to K2O based DFMs, in terms of the capacity of CO2 capture and the reaction speed of hydrogenation. Furthermore, MgO based DFMs showed the poorest performance (0.1540 mol of CO2/kg of sample).
