Synthesis gas production from carbon dioxide reforming of methane over Ni-MgO catalyst: Combined effects of titration rate during co-precipitation and CeO₂ addition

The Ni-MgO (NM) and Ni-MgO-CeO₂ (NMC) catalysts prepared by co-precipitation at different titration rates have been applied to carbon dioxide reforming of methane (CDR). The effects of titration rates on the catalytic properties and reaction behaviors of the catalyst were varied significantly depending on the CeO₂ addition. The titration rate mainly influenced the physical properties, such as Ni crystallite size and Ni dispersion, in NM catalysts, but for the NMC catalysts, chemical properties, such as oxygen storage capacity, also were affected. Regarding the change of titration rates, the NM catalysts exhibited the difference of activity, but NMC catalysts showed the difference of activity as well as stability. As a result, the NMC catalyst prepared at fast titration rate achieved the highest catalytic CDR performance at 800 °C and a high gas hourly space velocity of 720,000 mL∙g⁻¹∙L⁻¹.