Catalytic hydrogenolysis of native and organosolv lignins of aspen wood to liquid products in supercritical ethanol medium

Catalytic hydrogenolysis in the medium of supercritical organic solvents is a promising way wood lignins depolymerization into liquid products. In this study, for first time, catalytic properties bifunctional catalysts Ru/C, Pt/ZrO2, NiCuMo/SiO2, containing nanosized metal particles on acidic groups are compared processes aspen and ethanol lignin ethanol. The most active Ru/C Pt/ZrO2 which provide high conversion (to 78.0 wt%), significant yield products 50.6 wt%) low solid rest 22.0 at temperature 250 °C H2 pressure 9.0 MPa. These increase monomeric compounds from 10.5 % to 50.4 mass lignin. GC–MS analysis shows that alkyl derivatives methoxyphenols (mainly propyl syringol guaiacol) dominated Solid contain mainly cellulose 82.2 wt%). Therefore, presence by functional allows fractionate biomass enriched with guaiacol. lower wood. This probably due reduced content reactive β-O-4 bonds structure native As follows results obtained, easier depolymerized process than lignin, isolated According GPC data, shift region molecular distribution hydrogenolysis.