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Show event image and caption × Lignin (an aromatic macromolecule in biomass), the only renewable source of aromatics, is currently treated as waste and under-utilized. A more appealing and value-added use of lignin is as a precursor for the production of aromatic chemicals. The depolymerization of lignin selectively into its monomers can be achieved by the appropriate combinations of solvent, catalyst, and reaction conditions. However, due to the considerable complexity and natural variation in the molecular structure of lignin, mechanistic studies of catalytic lignin depolymerization are challenging. Beyond that, lignin depolymerization usually (1) requires relatively high temperature (above 200 °C) and pressure (above 80 bar); (2) involves co-existence of solid, liquid and gas phases; and (3) differs from typical catalytic reactions due to the macromolecular nature of the substrate. In this study, we have synthesized 13C labeled lignin model polymers with only β-

Arthur ragauskasMarcus fostonDepartment of energyBioenergy science centerEngineering departmentPacific northwest national laboratorySchool of chemistryGeorgia institute of technologyChemical engineeringWashington universityAssociate professorPolymer chemistryMaterial scienceGeorgia instituteEnergy science centerFulbright distinguished chair