Around 10 cycles of ICCU-DRM (19 hours of processing) were reported by Molina-Ramirez et al. (https://doi.org/10.1016/j.jcou.2020.101201). The authors used Ni-Ba based dual functional materials at 600°C, and focused on CO2 and methane conversion and H2/CO ratio. As shown in the following figure, The conversion of CO2 and CH4 is significantly reduced after 3 cycles of ICCU. The ratio of H2/CO increases to more than 50 at the end of the process, indicating that there is significant carbon formation derived from the decomposition of methane. The overall low conversion of methane and CO2 might be due to the type of sorbent (BaO) used in this work.
(https://doi.org/10.1016/j.jcou.2020.101201)
The concentration profile of ICCU-DRM is shown below. Seven cycles of ICCU could be carried out within 250 mins. It is clear that hydrogen production is reduced after 3 or 4 cycles of ICCU. The reduction of CO production should be larger than H2 with the increase of ICCU cycles. It is noted that CO is produced during the carbon capture stage, which is ascribed to the reaction between CO2 and deposited carbon.
