Восстановительное каталитическое фракционирование древесины березы в среде этанола с использованием нового бифункционального катализатора Ni/HfO2

A novel bifunctional catalyst based on Ni supported on hafnium oxide was prepared to depolymerise birch wood lignin. A native lignin fraction of birch wood was promptly depolymerised into valuable phenolic monomers, enriched with propenylsyringol through one-pot catalytic reductive fractionation at 225 °C, and 4 MPa H2 during 3 hours. The yield of liquid products increased from 23 to 37 wt.% under the hydrogenation in the presence of catalyst. Detailed Brunauer- Emmett-Teller, рН of the point of zero charge, and X-ray photoelectron spectroscopy investigations revealed that the metal–acid synergistic effect in the presence of acid sites and of both Ni2+ and Ni 0 were responsible for the breaking of C–C bond, ester and ether linkages bonds in lignin. Moreover, modifying catalyst by phosphoric acid generated propenylsyringol in higher yield. Overall, this report highlighted the potential of the simple preparation strategy of the bifunctional catalyst based on Ni supported on acidic HfO2 to depolymerize wood lignin and proposed possible mechanism for reductive catalytic fractionation of birch wood biomass