| 초록 |
Complete hydrodeoxygenation(HDO) of vanillin to yield cycloalkanes was performed using bifunctional Ru loaded HZSM-5 catalysts with different metal loadings (0.1, 0.5, 1, 3, and 5 wt.%) and Si/Al2 ratios (Si/Al2 = 23, 300) in n-octane/water biphasic system. Both reaction pathway and product distribution were influenced by the metal/acid balance of the catalysts. Higher metal/acid ratio promoted Caryl-C cleavage reaction, resulting in the increased yield of cyclohexane. Synergetic effect of metal and acid sites was observed in bifunctional catalyst, attaining as high as 40-fold increase of metal efficiency in ring hydrogenation reaction, compared to the catalyst when only metal site was applied. The effect of solvent composition was evaluated, revealing that presence of water promoted the overall HDO reaction. By balancing metal/acid and introducing appropriate solvent system, efficient catalytic system minimizing carbon loss and improving metal efficiency was obtained. |
