Tuning Ru/Ni sites in the perovskite-based precursor synthesis to make more efficient and durable dual-function materials for integrated CO2 capture and methanation
Year: 2025
Type: article
Abstract: A new generation of Dual Function Materials (DFMs) were obtained after the controlled reduction of 20 % La 0.6 Ca 0.4 Ni 0.95 Ru 0.05 O 3 /CeO 2 synthesized combining citric acid-wetness impregnation methods. Different parameters such as pH of the starting solution, calcination protocol were modified in order to synthesize materials with variable nanostructure, surface chemistry and textural properties, thereby effectively tuning the material activity and stability for the integrated CO 2 adsorption and in situ methanation operation. The samples were extensively characterized before and after catalytic tests by XRD, Raman, STEM-EDS, XPS, N 2 adsorption-desorption, H 2 -TPR, H 2 -TPD, CO 2 -TPD, and H 2 -TPSR. It was found that the DFM obtained from the precursor prepared in absence of NH 3 promoted Ru accommodation within the perovskite structure. The corresponding DFM showed enhanced textural properties, Ru/Ni actives sites accessibility and weak/medium basic sites concentration and, consequently, displayed the highest CH 4 yield (312 µmol g −1 ) and fastest CH 4 production kinetics under cycles of CO 2 adsorption and in situ hydrogenation to CH 4 . Furthermore, this sample showed higher stability than conventional Ru-based DFMs, with CH 4 production decreasing by less than 6 % compared to 25 % observed for conventional ones, due to a lower tendency for metal sintering, emerging as a promising alternative for long-term operation under realistic industrial conditions.
Source: Journal of CO2 Utilization
Institution: University of the Basque Country
Language: English
Subfield: Catalysis
Field: Chemical Engineering
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,360
Awards: G1361436036, G1662759650, G4950847129
OpenAlex ID: W4410085676