| 초록 |
Catalytic ethanol steam reforming was investigated over Pt/CeO2 catalyst in an electric field at low temperature, and the effect of the electric field and controlling factors for the activity and selectivity were examined. With imposing the electric field, ethanol steam reforming proceeded at low temperature as 423K, at which temperature a conventional catalytic reaction hardly proceeded. Moreover, in the reaction with electric field, CH3CHO selectivity was low and CO+CO2 selectivity was higher than that in the conventional catalytic reaction, which indicated that steam reforming of acetaldehyde was promoted by imposing the electric field. The supported platinum worked as an active site and has great impact on the activity and selectivity for the ethanol steam reforming in the electric field. Conversion of ethanol and H2 yield drastically increased with imposing the electric field, and apparent activation energies for three elementary reactions (ethanol dehydrogenation, acetaldehyde decomposition, and acetaldehyde steam reforming) were lowered by the electric field. In-situ DRIFTS measurements revealed that the adsorbed ethanol forms reactive acetate species by imposing the electric field even at low temperature, which improved hydrogen selectivity. This process can produce hydrogen from bio-ethanol using less energy at low temperature, such as 423K with a high efficiency. |
