RT Journal Article
T1 Influence of second metal incorporation on nickel-based unsupported catalysts for CO2 reduction (CO2-SR) Technology
A1 Essounani-Mérida, Sofía
A1 Molina-Ramírez, Sergio
A1 Cortés-Reyes, Marina
A1 Herrera-Delgado, María Concepción
A1 Larrubia-Vargas, María Ángeles
A1 Alemany-Arrebola, Luis José
K1 Catálisis
K1 Catalizadores
K1 Metales alcalinoterreos
K1 Gases de efecto invernadero - Reducción
AB The incorporation of alkali or alkaline-earth metals in unsupported Ni-based catalyst was analyzed as a strategy for high-temperature CO2 storage and chemical regeneration via methane, within the framework of CO2 storage–regeneration (CO2-SR) technology. It was observed that the addition of Ba, Ca, Sr and K into the Ni-catalyst modifies not only the textural but also the electronic properties of the catalysts. A restructuring of the unsupported oxide surface occurs by the reduction of the modified Ni-oxide catalyst when exposed to a H2-atmosphere at high temperature (600 °C). Upon oxygen release from NiO lattice, the alkali metals favor the reduction and stabilization of these Ni-metallic species. In such a way, nickel-metallic particles are formed from the NiO-bulk, thus generating unsupported metal catalysts; stabilized by interaction with alkali metals and anchored on the surface. The presence of Ba, Ca, Sr or K in the Ni-based catalyst formulation influences the CO2 storage capacity and regeneration by conversion employing CH4 registering the trend Ca>Ba>K>Sr for the catalytic activity at 600 °C in term of CO2 removal capacity and CH4 conversion.
PB Elsevier
YR 2025
FD 2025-04-12
LK https://hdl.handle.net/10630/40126
UL https://hdl.handle.net/10630/40126
LA eng
NO Results in Engineering Volume 26, June 2025, 104921
DS RIUMA. Repositorio Institucional de la Universidad de Málaga
RD 20 ene 2026