| 초록 |
Upgrading of bio-oil resulted from lignin depolymerization into compounds with high heating value have been conducted. Here, formic acid was utilized as in-situ hydrogen source for hydrodeoxygenation of the bio-oil. The effects of the reaction parameters such as solvent, temperature, time, catalyst amount, formic acid amount have been observed in the presence of commercial CoMo/Al2O3 catalyst. Polar solvents have high reactivity with CoMo compete with the bio-oil to reach the catalyst surface. On the other hand, non-polar solvents provide good deoxygenation degree, but the solvent separation is the main issue. Varying the reaction temperature results in different composition of the deoxygenated species and deoxygenation activity. At 350oC, the O content can be reduced significantly from 23.3wt% to 7.7wt%. Increasing the catalyst amount resulted in further deduction of the O content to 2.6wt%. In contrast, increasing formic acid amount did not affect much on the deoxygenation degree but there were some differences in terms of bio-oil composition. |
