Ca doping effect on the performance of La1?xCaxNiO3/CeO2-derived dual function materials for CO2 capture and hydrogenation to methane

CO2 valorization in form of synthetic natural gas is a convenient way to store large amounts intermittent energy produced from renewable sources for long periods time. Here reported research addresses the development novel dual function materials (DFMs) utilization simulated post-combustion effluent by cyclic adsorption and in-situ methanation. These DFMs, obtained after controlled reduction 20% La1-xCaxNiO3/CeO2-type precursors (with x=0-0.5), are widely characterized before catalytic tests. XRD diffractograms, H2-TPD experiments STEM-EDS images denote that Ca-doping shows low influence on composition, slight detrimental effect textural properties no Ni, La Ce distribution. Meanwhile, concentration Ca-based species increases as La3+ substitution Ca2+ increases, which leads progressively promotion medium and, especially, strong basic sites (CO2-TPD). As result, La0.5Ca0.5NiO3/CeO2-derived DFM almost doubles (188.8 µmol g-1) CH4 production LaNiO3/CeO2-derived (96.5 at high temperatures. Indeed, this enhances methanation capacity conventional 15% Ni-15% CaO/Al2O3 (143.0 g-1), with higher stability during long-term adaptability under variable feed compositions, further support applicability these DFMs. Thus, Ca doping emerges an effective tailoring hydrogenation efficiency