| 초록 |
In this study, systematic approach has been applied to elucidate the promotional effect achieved via hydrogen spillover in the liquid phase in the hydrogenation reaction of guaiacol, which was conducted using Ru/TiO2 catalysts with various Ru loadings diluted with pristine TiO2. Ru was highly dispersed at low Ru loadings, while the dispersion gradually decreased with increasing loading, which induced the formation of Ru NPs in the high-Ru-loading catalysts. For the catalysts with Ru NPs, hydrogen spillover was activated at the reaction temperature of 100 °C, and the spilt-over hydrogen on TiO2 contributed additional active sites, which resulted in a significant enhancement in the metal efficiency. The optimal Ru loading was found to be 3 wt.%, and the metal efficiency was deterred at higher Ru loadings owing to the decrease in dispersion, although this drawback was compensated when additional active sites are introduced by the incorporation of pristine TiO2. Based on the understanding the nature of hydrogen spillover, we anticipate these promotional effect in metal efficiency by utilizing hydrogen spillover could be applied to other biomass hydrogenation reactions. |
