Stability of LaNiO3/CeO2 for ICCU-methanation (16 cycles)

https://doi.org/10.1016/j.fuel.2022.123842

“Fig. 9 shows the evolution of CH₄ and CO productions with the number of CO₂ adsorption/hydrogenation cycles for 30% LaNiO₃/CeO₂-derived sample at 520 °C. As can be observed, CH₄ and CO productions as well as selectivity towards methane remain almost stable irrespective of time elapsed. Specifically, the CH₄ production slightly decreases from 80 µmol g⁻¹ to 78.4 µmol g⁻¹, whereas CO production keeps at 9.3–9.4 µmol g⁻¹. This catalytic behaviour reveals the high stability of the developed DFM towards CO₂ adsorption and hydrogenation in consecutive cycles. The close contact between Ni⁰ NPs, La₂O₃ and CeO₂ phases (Fig. 2), formed after the controlled reduction of 30% LaNiO₃/CeO₂, prevents the thermal agglomeration of Ni NPs during calcination and CO₂ methanation reaction processes, in line with the observed by Wang et al. [35] for Ni-La₂O₃/SBA-15 catalyst.”

“Fig. 9. Evolution of CH₄ and CO productions during the stability test (16 cycles at 520 °C) for the DFM obtained after the controlled reduction of the 30% LaNiO₃/CeO₂ precursor.”