LAUSR

Lignin-first depolymerization of lignocellulosic biomass into aromatics is of great significance in pursuit of a sustainable biorefinery; however, it remains challenges due to the variance between lignin source and structure. Here, we report that ruthenium supported on carbon nanotube (Ru/CNT) exhibits efficient catalytic activity toward lignin hydrogenolysis to exclusively afford monophenols in high yields. Catalytic tests indicate that the yields of aromatic monomers are extensively related to lignin sources and decrease in the order: hardwoods > herbaceous plants > softwoods. Experiment results demonstrate the sufficient scissor of C-O bonds together with high selectivity of monomeric aromatic compounds over Ru/CNT catalyst was enhanced through avoiding side condensation. Furthermore, the fabricated Ru/CNT shows good reusability and recyclability, practicability, and biomass feedstock compatibility, rendering it a promising candidate for lignin valorization. These findings pave the way for rational design of highly active and stable catalysts to potentially address challenges in lignin chemistry.