Deactivation of Ni catalyst in three-phase CO 2 methanation

Key Points

• This research aims to investigate the deactivation of Ni catalysts in CO2 methanation processes.
• Utilized a slurry bubble column reactor for three-phase CO2 methanation.
• Examined the effects of reactor temperatures over 260 °C on Ni/SiO2 catalyst performance.
• Measured catalytic activity loss after prolonged operation at high temperatures.
• Observed 50% loss of catalytic activity after 120 hours of operation at 320 °C.
• Identified dibenzyl toluene decomposition as a cause for catalyst deactivation.
• Confirmed carbon deposition on the catalyst surface due to high reactor temperature.