| 초록 |
Various methods have been developed for converting lignin into mono-phenolics; however, lignin valorization is still remained a great challenge, because intact lignin was converted into more condensed structure during the isolation. The aim of this work is fractionation of lignocellulosic biomass into selective mono-phenolic in presence of dispersed Ni alumina catalyst. In a mixture of ethanol, water and formic acid at 190 °C, oak wood was converted 23.4 C% of mono-phenolics and highly delignified cellulose rich pulp. At an early stage of reaction, formic acid worked as an acid catalyst to extract lignin from the lignocellulosic biomass. Then, the formic acid was decomposed into H2, which was used to stabilization of fractionated lignin by catalytic hydrogenation. We found that hydrogen spillover effect and lignin derived phenolic monomer yield have positive correlation. Enzymatic saccharification of the pulp indicated that the pulp can be an excellent source of fermentable sugars. |
