Oxygen storage capacity Catalyst supports 4 Nickel 4 Oxygen 4 Urea 4 Water gas shift 4 Water-gas shift reaction (WGS) 4 Activation energy 2 Alkalinity 2 Apparent activation energy 2 CO 2 methanation 2 CO removal 2 Carbon dioxide 2 Catalyst activity 2 Catalytic performance 2 Ce-Pr mixed oxides 2 Ceria 2 Ceria support 2 Cerium compounds 2 Cerium oxide 2 Chemical reactors 2 Copper 2 Copper and nickel catalysts 2 Cu-Ni catalysts 2 DFT calculation 2 DFT calculations 2 Decomposition 2 Density functional theory 2 Doped ceria 2 Doped-ceria 2