Selective Catalytic Transfer Hydrogenation of Lignin to Alkyl Guaiacols Over NiMo/Al-MCM-41
Graphical Oil upgrading : This study investigates the efficient deoxygenation of lignin extracted from Chinese fir sawdust via oxidative delignification to sustainable liquid fuels rich in alkyl guaiacols through in-situ catalytic transfer hydrogenation using isopropanol, formic acid, and NiMo/Al-MCM-41 as organic solvent, internal hydrogen donor, and hydrodeoxygenation catalyst, respectively. Efficient deoxygenation of lignin-derived bio-oils is central to their adoption as precursors to sustainable liquid fuels in place of current fossil resources. In-situ catalytic transfer hydrogenation (CTH), using isopropanol and formic acid as solvent and in-situ hydrogen sources, was demonstrated over metal-doped and promoted MCM-41 for the depolymerization of oxygen-rich (35.85 wt%) lignin from Chinese fir sawdust (termed O-lignin). A NiMo/Al-MCM-41 catalyst conferred an optimal lignin-derived oil yield of 61.6 wt% with a comparatively low molecular weight ( M w =542 g mol −1 , M n =290 g mol −1 ) and H/C ratio of 1.39. High selectivity to alkyl guaiacols was attributed to efficient in-situ hydrogen transfer from isopropanol/formic acid donors, and a synergy between surface acid sites in the Al-doped MCM-41 support and reducible Ni/Mo species, which improved the chemical stability and quality of the resulting lignin-derived bio-oils.
危险品化学品经营许可证（带存储）