CO2 hydrogenation on Co/CeO2-δ catalyst: Morphology effect from CeO2 support

The Co/CeO2-delta catalysts with different morphology structure were prepared for CO2 catalytic hydrogenation reaction. The physical and chemical properties of these catalysts were characterized by H-2-TPR, XRD, TEM, ICP and H-2-TPD. The characterization results indicated that the different morphology structure of CeO2 support obviously influence the exposed crystal plane, and then affect the concentration of oxygen vacancies, the metal-support interaction and the dispersion of Co-0 active species on the CeO2 support. In addition, the Co ions can be dissolved into the CeO2 lattice to form Ce-O-Co solid solution, which promotes the formation of Co-0 active species, oxygen vacancies, and the Ce3+ -square-Co-0 structure, thus significantly affects the CO2 hydrogenation performance of Co/CeO2-delta catalysts. The exposed {110} and {100} crystal plane of CoCe140 catalyst with nano-rods structure ensure the excellent CO2 hydrogenation performance, including CO2 conversion is 48.7%, the CH4 and CO selectivity are 91.7% and 8.3%, respectively. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.