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

CO 2 capture and utilization has been considered as an up-and-coming short- to mid-term approach to mitigate the excessive CO 2 emission. Comparing to the conventional separate capture, transportation and conversion arrangement, the integrated CO 2 capture and utilization (ICCU) could largely simplify the complex process and reduce the energy consumption. However, the poor stability of high-temperature CO 2 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 K 2 CO 3 -doped Li 4 SiO 4 as an efficient CO 2 sorbent for ICCU operating at a relatively low temperature by dry reforming of methane. Results show that the ratio of H 2 /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.