Chemical Looping of Calcium‐Based Mineralization With Methane‐CO 2 Reforming for Syngas Production
Chien‐Wei Wu, Paweethida Nguankratok, Zhi Xuan Law, Varong Pavarajarn, De‐Hao TsaiABSTRACT
A prototype approach was developed by integrating CO 2 capture and utilization strategy through the incorporation of amine‑based CO 2 capture with calcium‑based mineralization (carbonation), followed by coupling with two decarbonation routes, methane dry reforming (DRM) and methane pyrolysis followed by reverse Boudouard reaction (MP‐RBR) for syngas production. The results demonstrate that high efficiencies in CO 2 loading (0.57 mol of CO 2 /mol of amine) and subsequent carbonation of Ca source (100%) were achievable. Both the mineralization temperature and the choice of Ca source affected crystallinity and corresponding basicity of the formed CaCO 3 . The performance of DRM and MP‐RBR were inversely proportional to the basicity of CaCO 3 , attributable to the decrease in decarbonation. High conversions of CO 2 (98.5%) and carbon deposit (80.1%) were achievable under a relatively lower temperature ( T = 650°C) by using decarbonation‐MP‐RBR route, with excellent operational stability over 10 consecutive cycles. The successful integration of calcium‐based mineralization with methane‐CO 2 reactions demonstrates the potential of chemical looping via room‐temperature carbonation and decarbonation for syngas production. The findings provide valuable insights into the development of integrated technologies for upstream CO 2 capture and downstream CO 2 utilization in large‐scale industrial applications.