With Pt as anode, saturated calomel electrode as reference electrode,the effects of different electrolytic cells, electrolytic solvents, supported electrolytes and cathode materials on electrochemical hydrogenation of...With Pt as anode, saturated calomel electrode as reference electrode,the effects of different electrolytic cells, electrolytic solvents, supported electrolytes and cathode materials on electrochemical hydrogenation of lignin were studied.The results showed that electrolytic hydrogenation of lignin was better in the electrolytic system of DMF+EtOH+H 2O+Bu 4NBr with sponge Pb as cathode in the divided electrolytic cell than in the other selected electrolytic systems in terms of ultimate analysis and soft point of hydrogenated lignin.After electrolysis, the hydrogen content and the atomic ratio of hydrogen to carbon of hydrogenated lignin can increase by 0.81 and 0.02 respectively, but the soft point of hydrogenated lignin can decrease by 9℃. At the same time, current dependence of potential indicated that electrolytic hydrogenation of lignin can be carried out in this electrolytic system.展开更多
The metal-acid bifunctional catalysts have been used for bio-oil upgrading and pyrolytic lignin hydrocracking. In this work, the effects of the metal-acid bifunctional catalyst prop- erties, including acidity, pore si...The metal-acid bifunctional catalysts have been used for bio-oil upgrading and pyrolytic lignin hydrocracking. In this work, the effects of the metal-acid bifunctional catalyst prop- erties, including acidity, pore size and supported metal on hydrocracking of pyrolytic lignin in supercritical ethanol and hydrogen were investigated at 260 ℃. A series of catalysts were prepared and characterized by BET, XRD, and NHa-TPD techniques. The results showed that enhancing the acidity of the catalyst without metal can promote pyrolytic lignin poly- merization to form more solid and condensation to produce more water. The pore size of microporous catalyst was smaller than mesoporous catalyst. Together with strong acid- ity, it caused pyrolytic lignin further hydrocrack to numerous gas. Introducing Ru into acidic catalysts promoted pyrolytic lignin hydrocracking and inhibited the polymerization and condensation, which caused the yield of pyrolytic lignin liquefaction product to increase significantly. Therefore, bifunctional catalyst with high hydrocracking activity metal Ru supported on materials with acidic sites and mesopores was imperative to get satisfactory results for the conversion of pyrolytic lignin to liquid products under supercritical conditions and hydrogen atmosphere.展开更多
文摘With Pt as anode, saturated calomel electrode as reference electrode,the effects of different electrolytic cells, electrolytic solvents, supported electrolytes and cathode materials on electrochemical hydrogenation of lignin were studied.The results showed that electrolytic hydrogenation of lignin was better in the electrolytic system of DMF+EtOH+H 2O+Bu 4NBr with sponge Pb as cathode in the divided electrolytic cell than in the other selected electrolytic systems in terms of ultimate analysis and soft point of hydrogenated lignin.After electrolysis, the hydrogen content and the atomic ratio of hydrogen to carbon of hydrogenated lignin can increase by 0.81 and 0.02 respectively, but the soft point of hydrogenated lignin can decrease by 9℃. At the same time, current dependence of potential indicated that electrolytic hydrogenation of lignin can be carried out in this electrolytic system.
文摘The metal-acid bifunctional catalysts have been used for bio-oil upgrading and pyrolytic lignin hydrocracking. In this work, the effects of the metal-acid bifunctional catalyst prop- erties, including acidity, pore size and supported metal on hydrocracking of pyrolytic lignin in supercritical ethanol and hydrogen were investigated at 260 ℃. A series of catalysts were prepared and characterized by BET, XRD, and NHa-TPD techniques. The results showed that enhancing the acidity of the catalyst without metal can promote pyrolytic lignin poly- merization to form more solid and condensation to produce more water. The pore size of microporous catalyst was smaller than mesoporous catalyst. Together with strong acid- ity, it caused pyrolytic lignin further hydrocrack to numerous gas. Introducing Ru into acidic catalysts promoted pyrolytic lignin hydrocracking and inhibited the polymerization and condensation, which caused the yield of pyrolytic lignin liquefaction product to increase significantly. Therefore, bifunctional catalyst with high hydrocracking activity metal Ru supported on materials with acidic sites and mesopores was imperative to get satisfactory results for the conversion of pyrolytic lignin to liquid products under supercritical conditions and hydrogen atmosphere.
