Self-Regenerative Ni-Doped CaTiO₃/CaO for Integrated CO₂ Capture and Dry Reforming of Methane

In this work, a new type of multifunctional materials (MFMs) called self-regenerative Ni-doped CaTiO₃/CaO is introduced for the integrated CO₂ capture and dry reforming of methane (ICCDRM). These materials consist of a catalytically active Ni-doped CaTiO₃ and a CO₂ sorbent, CaO. The article proposes a concept where the Ni catalyst can be regenerated in situ, which is crucial for ICCDRM. Exsolved Ni nanoparticles are evenly distributed on the surface of CaTiO₃ under H₂ or CH₄, and are re-dispersed back into the CaTiO₃ lattice under CO₂. The Ni-doped CaTiO₃/CaO MFMs show stable CO₂ capture capacity and syngas productivity for 30 cycles of ICCDRM. The presence of CaTiO₃ between CaO grains prevents CaO/CaCO₃ thermal sintering during carbonation and decarbonation. Moreover, the strong interaction of CaTiO₃ with exsolved Ni mitigates severe accumulation of coke deposition. This concept can be useful for developing MFMs with improved properties that can advance integrated carbon capture and conversion.