Capture-Conversion-Capture (3C) process for ICCU-RWGS

https://doi.org/10.1016/j.ccst.2021.100001

“Based on the above results, we propose an improved ICCU process including CO₂ capture, conversion and re-capture to deliver pure syngas from flue gas (as illustrated in Fig. 3). The improved ICCU process has three steps, including 1) using CaO-alone to capture CO₂ from flue gas to reduce CO₂ emission; 2) using the mixture of CaO/CaCO₃ as the catalyst to regenerate CaCO₃ and to convert the captured CO₂ into CO by switching gas to H₂; 3) using another same CaO bed as a sorbent to remove un-reacted CO₂ to produce pure syngas, and the saturated CaO can be similarly regenerated by introducing H₂. Since no other metal catalysts are added, the deactivated CaO can be used for cement manufacturing to avoid secondary pollution.”

Fig. 3. Schematic diagram of improved ICCU process