Low-temperature Conversion of Carbon Dioxide to Methane in an Electric Field
Kensei Yamada, Shuhei Ogo, Ryota Yamano, Takuma Higo, Yasushi Sekine
Abstract
CO2 methanation was conducted at low temperatures with an electric field. Results show that 5 wt %Ru/CeO2 catalyst exhibited high and stable catalytic activity for CO2 methanation with the electric field. The kinetic investigations and in-situ DRIFTS measurements revealed that Ru/CeO2 catalyst promoted CO2 methanation and Ru at the Ru–CeO2 interface (low-coordinated Ru sites) contributes to the reverse water gas shift reaction at low temperatures in the electric field. Hydrogenation of CO2 to CH4 proceeds over Ru/CeO2 catalyst in an electric field even at low temperatures below 473 K, where conventional catalytic reaction without the electric field does not proceed. In the electric field, Ru/CeO2 catalyst exhibits high and stable activity without the hindrance of CO adsorbed on the Ru particle surface.