(364d) Cellulose Hydrolysis Catalyzed By Solid Acid to Levulinic Acid

As a clean renewable energy, biomass energy is of great significance to environmental protection, especially “carbon reduction”. In this thesis, a highly efficient catalytic system for producing levulinic acid was developed to promote the conversion of cellulose. Lignosulfonate was activated by phosphoric acid, carbonized and sulfonated by sulfanilic acid to prepare lignin-based solid acid catalyst with high specific surface area and high -SO₃H load. It was proved that more phosphorus-containing groups would be grafted on the catalyst surface at high impregnation ratio and high temperature, which provided more grafting sites for -SO₃H. In the biphasic reaction system (V_MIBK:V_H2O=1:1, 0.2g/mL NaCl), the highest yield of levulinic acid was 67.93% under the conditions of reaction temperature of 190℃, reaction time of 150min, PLSA4-700 loading of 50wt% and substrate loading of 2wt%. In addition, the catalyst showed excellent catalytic performance and good cycling.