Production of chemicals via tandem conversion of bio-oil derived fractions.

Studying chemical production from biomass is essential for developing sustainable and eco-friendly alternatives to fossil-derived chemicals, reducing greenhouse gas emissions, and promoting a circular bioeconomy. In this study a new biomass upgrading route was proposed including extraction of phenolic fraction followed by catalytic hydroconversion and then dehydration to olefins. The conversion of bio-oil fraction into olefins was developed using a continuous-flow setup with two reactors for tandem hydrogenation – dehydration process (225 °C in the 1st reactor with 2 % Ru over titanosilicalite-1 (TS-1) catalyst, 160 °C in the 2nd reactor with BEA catalyst, 5 MPa H2, LHSV 1.5 h−1). The optimized mild conditions were determined for each stage of the catalytic conversion process, which allowed us to obtain cyclohexene from bio-oil-derived compounds with a selectivity of up to 70 %. The olefin fraction was further transformed to silicon-organic chemicals via hydrosilylation on Pt catalyst. Using in situ DRIFT technique and in situ X-ray absorption spectroscopy (XAS) we determined the mechanism of selective hydrodeoxygenation and evolution of Ru species.