CO and CO2 methanation over Ni catalysts supported on CeO2, Al2O3 and Y2O3 oxides

• Published in: Applied catalysis. B, Environmental Vol. 264; p. 118494
• Main Authors: Italiano, C., Llorca, J., Pino, L., Ferraro, M., Antonucci, V., Vita, A.
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 05.05.2020; Elsevier BV
• Subjects: Aluminum oxide; Basicity; Carbon dioxide; Carbon monoxide; Carbon oxides; Catalysts; Cerium oxides; Chemisorption; CO and CO2 methanation; Coking; Combustion synthesis; Deactivation; Methanation; Methane production; Ni catalysts; Ni/Y2O3; Oxides; Support effect; Temperature; Yttrium oxide; Support effect; Ni/Y2O3; Methane production; Ni catalysts; CO and CO2 methanation
• ISSN: 0926-3373; 1873-3883
• DOI: 10.1016/j.apcatb.2019.118494

[Display omitted] •CO and CO2 methanation was studied over Ni/CeO2, Ni/Al2O3, and Ni/Y2O3 catalysts.•High activity of the Ni/Y2O3 catalysts due to moderate Ni-support interactions.•Structure-sensitive CO2 methanation reaction over Ni/Y2O3 catalysts.•Best correlation between TOF of CO2 conversion and moderate-strength basicity.•Good anti-coking and anti-sintering ability after 200 h of lifetime test over 25Ni/Y2O3. Methanation of carbon oxides (CO and CO2) was studied over Ni-based catalysts supported on CeO2, Al2O3, and Y2O3 oxides. Catalysts were synthesized by solution combustion synthesis and characterized by N2-physisorption, XRD, H2-TPR, TEM, CO-chemisorption, UV–vis DRS, XPS, and CO2-TPD. The effect of reaction temperature (250−500 °C) was investigated under atmospheric pressure, space velocity (GHSV) of 10,000 h−1, and stoichiometric reactants ratio of (H2-CO2)/(CO + CO2) = 3. It can be concluded that the nature of Ni-support interactions played a crucial role in enhancing CO and CO2 hydrogenation at low reaction temperature. Ni/CeO2 catalyst deactivated rapidly due to coke deposition, while the formation of NiAl2O4 spinel explained the lower activity of the Al2O3-supported system. Activity data for Ni/Y2O3 catalysts were closely related to the degree of Ni dispersion as well as to the medium-strength basicity. Good anti-coking and anti-sintering ability were observed after 200 h of lifetime test.