Effects of Ni loading and Ce doping on a CaO-based dual function material for integrated carbon capture and in situ methanation

Integrated CO2 capture and utilization (ICCU) emerges as an effective strategy for reducing CO2 emissions, offering benefits such as facility simplification and improved energy efficiency. To further optimize the performance of ICCU-methanation dual-function materials (DFMs), a Ni/CeNiCa DFM featuring a Ce promoter and Ni pre-doping was synthesized using a one-pot method and impregnation technique. This resulted in an impressive CO2 capture capacity of 11 964 mu mol gDFM-1 and a CH4 production yield of 11 061 mu mol gDFM-1. The pre-doping of Ni serves as a promoter and catalyst, whereas the impregnation-loaded Ni enhances the catalytic effectiveness of the DFM. Despite its impact on the reduction of NiO, the Ce doping proves valuable by modulating the active crystal surface of Ni, thus enhancing the methane production rate. In addition, 3% O2 addition barely influences the CO2 capture capacity and CH4 production yield but slightly inhibits the CH4 production rate. Furthermore, 500 ppm NOx can have severe irreversible effects on the adsorbent, indicating that DeNOx facilities are necessary for the application of the ICCU system.