Efficient-and-stable CH₄ reforming with integrated CO₂ capture and utilization using Li₄SiO₄ sorbent

CO₂ capture and utilization has been considered as an up-and-coming short- to mid-term approach to mitigate the excessive CO₂ emission. Comparing to the conventional separate capture, transportation and conversion arrangement, the integrated CO₂ capture and utilization (ICCU) could largely simplify the complex process and reduce the energy consumption. However, the poor stability of high-temperature CO₂ sorption/desorption severely limit the potential of ICCU. Therefore, it is indispensable to develop a new sorbent/catalyst system ensuring the high-efficiency and long-term operation of the ICCU. In this paper, we propose and demonstrate the feasibility and performance of using K₂CO₃-doped Li₄SiO₄ as an efficient CO₂ sorbent for ICCU operating at a relatively low temperature by dry reforming of methane. Results show that the ratio of H₂/CO produced is stabilized at 1 ± 0.05 in the pre-breakthrough stage, and the duration extends to be 1.6 times of the original value in the cyclic operations, displaying an excellent performance in reaction matching and process stability.