Effect of Na and K impurities on the performance of Ni/CeZrOx catalysts in DBD plasma-catalytic CO2 methanation

Carbon dioxide hydrogenation to synthetic fuels and value-added molecules has been lately proposed as a promising technology stabilize anthropogenic greenhouse gas emissions. Alkali compounds are often present in biomass pyrolysis/gasification syngas or can remain on the surface of catalyst upon its synthesis. Their presence conditions performance used CO2 reaction. This extends plasma-activated catalysis since alkali moreover alter electric features catalytic material. In work, non-thermal plasma (NTP)-assisted methanation was performed over metal (Na K)-containing Ni/CeZrOx catalysts. The influence such physicochemical, dielectric behavior these materials during on-plasma operation assessed. Na K impurities resulted decreased conversions, lower selectivity CH4 increased power consumption. interaction with both support active phase led more difficult reduction Ce-species, well an increase constant packed bed. Higher contributed energy dissipation favored strong ionization contained reactor gap, resulting CO formation consequence direct splitting. Finally, impeeded reducibility Ce-species adsorption form polydentate bridged carbonates which were not able participate cycle, poorer overall accumulation O C-species within support.