Lignin conversion into monomeric bio-aromatics is of high interest to the chemical industry to substitute fossil derived aromatics, which are becoming more expensive. However, most conversion processes so far show low to moderate conversion yields and selectivities. In this work, a novel solvent assisted catalytic process has been developed to depolymerize technical lignin into a depolymerized lignin oil with a less complex mixture of mono-aromatics [1]. The use of a heterogeneous catalyst based on Pd/C under hydrothermal conditions enables a higher selectivity without the need for external hydrogen addition. In this process in-situ hydrogen formation is occurring by aqueous phase reforming of lignin degradation products or an added solvent. Conversion yields of more than 50% of lignin oil with about 10% of identified monomeric aromatic products can be obtained at the current status. This novel catalytic solvent assisted hydrothermal process allows the selective conversion of lignin into industrially relevant bulk chemicals with in-situ hydrogen generation. [1] van der Klis, F., Gosselink, R.J.A., van Haveren, J. van Es, D.S. Lignin valorization, patent filed (2013) The financial support of the Dutch funded Topsector Energy project YXY Fuels (TKIBE01006) is kindly acknowledged. The authors apply for an oral presentation at the 249th ACS Conference, March 22-26, 2015 Denver Colorado in the Lignin biosynthesis, characterization and modification symposium.

Catalytic hydrogen-free conversion of lignin in key aromatics

249th National Meeting (2015)

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