Coke deposition on Ni-Ba based dual functional materials for ICCU-DRM was analysed using Raman Spectroscopy (https://doi.org/10.1016/j.jcou.2020.101201). D-band and G-band peaks are used for carbon observation. As shown in the following figure, there is no carbon deposition after the 1st cycle of CO2 adsorption. Both D- and G-bands are clearly observed after the introduction of methane for the utilisation of the captured CO2. The intensities of these peaks are reduced slightly after the 2nd cycle of CO2 adsorption. It is suggested that some coke is oxidised by CO2 during the next cycle of carbon capture. However, it looks like the oxidation of coke at the carbon capture stage can not totally remove the deposited coke. This might cause the accumulation of coke deposition, causing the deactivation of catalysts.
