Abstract
Thermal conversion of flax shives was studied in sub- and supercritical ethanol medium at 225 and 250 °C in the presence of the bifunctional catalyst 3% Ru/C. The use of 3% Ru/C catalyst in the process of thermal conversion of flax shives in supercritical ethanol was found to increase the conversion of the shives by 27% and the yield of liquid products by 10%. The use of 3% Ru/C catalyst in sub- and supercritical ethanol led to the destruction of both lignin and cellulose. The degree of delignification in the non-catalytic thermal conversion increased upon transition from subcritical (225 °C) to supercritical (250 °C) conditions. Main monomeric products of the thermal conversion process were guaiacylpropene or guaiacylpropane depending on the process temperature. In the presence of Ru/C catalyst, the molecular weight distribution was shifted towards an increase in the content of monomeric compounds in the liquid products.
Highlights
Intensive R&D efforts are focused on new methods for the processing of lignins and biomass to components of engine fuels and chemicals [5,6,7]. One of these methods is the thermocatalytic conversion of lignocellulosic biomass; it is based on one-pot extraction and depolymerization of lignin [8,9,10]
Thermal conversion of flax shives in ethanol was studied in the presence of the bifunctional ruthenium catalyst supported on oxidized Sibunit-4
This catalyst is highly efficient for the thermal conversion of flax shives at 225–250 ◦ C for 3 h
Summary
Publisher’s Note: MDPI stays neutral with regard to jurisdictional claims in published maps and institutional affiliations. Intensive R&D efforts are focused on new methods for the processing of lignins and biomass to components of engine fuels and chemicals [5,6,7]. One of these methods is the thermocatalytic conversion of lignocellulosic biomass; it is based on one-pot extraction and depolymerization of lignin [8,9,10]. The present study was aimed at comparing processes of thermal conversion of flax shives in the sub- and supercritical ethanol in order to establish the influence of the Ru/C catalyst and hydrogen gas on the conversion of lignin, yields and composition of liquid and solid products
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