Thapanee JomjareePaweennut SintuyaAtthapon SrifaWanida Koo-amornpattanaSirapassorn KiatphuengpornSuttichai AssabumrungratMasao SudohRyo WatanabeChoji FukuharaSakhon RatchahatShizuoka UniversityChulalongkorn UniversityThailand National Nanotechnology CenterMahidol UniversityAmano Institute of Technology2020-10-052020-10-052020-01-01Catalysis Today. (2020)092058612-s2.0-85090925271https://repository.li.mahidol.ac.th/handle/20.500.14594/59032© 2020 Elsevier B.V. In this study, a series of Ni catalysts supported on CeO2 with different morphologies including nanopolyhedrons (PH), nanorods (NR), nanoparticles (NP) and nanocubes (NC) was prepared via hydrothermal / wet impregnation method. The catalytic performance of as-prepared catalysts was evaluated for low-temperature CO2 methanation. The Ni/CeO2 catalysts exhibited a superior CO2 conversion and CH4 selectivity over METH®134, a commercial methanation catalyst. The following order of activity was experimentally found: Ni/CeO2-PH > Ni/CeO2-NR > Ni/CeO2-NP > Ni/CeO2-NC > METH®134. Among different CeO2 morphologies, the Ni/CeO2-NR catalyst exhibited the largest surface area and the highest reducibility, providing the high oxygen vacancies/oxygen storage capacity (OSC). Nevertheless, the strong metal-support interaction (SMSI) between Ni and Ce of the Ni/CeO2-NR catalyst determined by H2-TPR posed a negative impact on the CO2 conversion at low temperature. Unexpectedly, the Ni/CeO2-PH catalyst possessed a single crystalline CeO2 nanostructure of ca. 7.4 nm with relatively high surface area and high reducibility especially at low reduction temperature. Therefore, the Ni/CeO2-PH catalyst was found to be the optimum catalyst for low-temperature CO2 methanation.Mahidol UniversityChemical EngineeringChemistryArticleSCOPUS10.1016/j.cattod.2020.08.010