| 초록 |
Reductive catalytic fractionation (RCF) of lignocellulosic biomass, in which lignin-derived phenolic monomers (LDPMs) can be produced from native lignin, and high-purity pulp-rich solid can be produced, is considered a promising strategy for biorefineries. Herein, we demonstrated core-shell Ni-aluminum oxide on activated carbon (Ni@Al2O3/AC) catalysts. The 23.4 C% of LDPMs, which is mainly composed of 4-n-propyl-guaiacol/syringol and 4-n-propenyl-guaiacol/syringol, was achieved from oakwood in a mixture of formic acid, ethanol, and water at 190 °C over Ni@Al2O3/AC. Formic acid acted as a co-catalyst to improve extraction of lignin from cell wall matrix in an initial stage of RCF, and it acted as a hydrogen donor for hydrodeoxygenation and hydrogenation of LDPMs. The positive correlation between spillover hydrogen on different Ni/Al ratio catalysts and LDPM yields was demonstrated by H2-TPD.
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