| 초록 |
To improve the long term catalytic stability without catalytic deactivation during ethanol steam reforming (ESR), this study considered two main areas; the role of the redox promoter of the Mn component in a Ni-based catalyst and the stability of the core@shell structure. The hydrogen selectivity was highest on the core@shell-structured Ni8.5Mn1.5/SiO2 catalyst compared to those of the other catalysts. During ESR, the amounts of carbon deposited were smallest over the Ni8.5Mn1.5/SiO2 catalyst. An ESR model over the core@shell-structured NiMn@SiO2 catalysts was suggested from the results of CH4-, CO- and H2O-TPD. CH4 and CO molecules, as intermediates, were adsorbed predominantly on the surface of metallic Ni, but water molecules were absorbed easily on the surface of the Mn sites, leading to a CO to CO2 transformation through a water gas shift reaction. |
