TY - JOUR
T1 - In situ investigation of the CO2 methanation on carbon/ceria-supported Ni catalysts using modulation-excitation DRIFTS
AU - Gonçalves, Liliana P.L.
AU - Mielby, Jerrik
AU - Soares, O. Salomé G.P.
AU - Sousa, Juliana P.S.
AU - Petrovykh, Dmitri Y.
AU - Lebedev, Oleg I.
AU - Pereira, M. Fernando R.
AU - Kegnæs, Søren
AU - Kolen’ko, Yury V.
PY - 2022
Y1 - 2022
N2 - The development of novel cost-efficient, high-performing catalysts for CO2 methanation that are active at low temperatures can be optimized through the understanding of the reaction mechanism on different materials. A series of Ni-based catalysts supported on CeO2 and carbon/CeO2 composites was investigated, showing that Ni nanoparticles supported on a carbon/CeO2 composite with a 50:50 weight ratio and on pure CeO2 have excellent low-temperature activity and achieve up to 87% CO2 conversion with full selectivity towards CH4 at 370 °C. Importantly, meaningful insights on the reaction mechanism were gathered for the different types of materials by using the emerging ME−PSD−DRIFTS technique. The study of the rate of formation/consumption of the various intermediates showed that the CO2 methanation reaction follows a combination of the CO and formate pathways in the case of Ni on pure CeO2; however, in the case of Ni on the carbon/CeO2 composite, it follows only the formate pathway.
AB - The development of novel cost-efficient, high-performing catalysts for CO2 methanation that are active at low temperatures can be optimized through the understanding of the reaction mechanism on different materials. A series of Ni-based catalysts supported on CeO2 and carbon/CeO2 composites was investigated, showing that Ni nanoparticles supported on a carbon/CeO2 composite with a 50:50 weight ratio and on pure CeO2 have excellent low-temperature activity and achieve up to 87% CO2 conversion with full selectivity towards CH4 at 370 °C. Importantly, meaningful insights on the reaction mechanism were gathered for the different types of materials by using the emerging ME−PSD−DRIFTS technique. The study of the rate of formation/consumption of the various intermediates showed that the CO2 methanation reaction follows a combination of the CO and formate pathways in the case of Ni on pure CeO2; however, in the case of Ni on the carbon/CeO2 composite, it follows only the formate pathway.
KW - Heterogeneous catalysis
KW - Carbon dioxide
KW - Methane
KW - Reaction mechanism
KW - In situ DRIFTS
U2 - 10.1016/j.apcatb.2022.121376
DO - 10.1016/j.apcatb.2022.121376
M3 - Journal article
SN - 0926-3373
VL - 312
JO - Applied Catalysis B: Environmental
JF - Applied Catalysis B: Environmental
M1 - 121376
ER -