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- W2555280960 abstract "Selective liquefaction of lignin is important for synthesis of value-added phenolic monomers contributing to green chemistry and sustainable energy applications. In the present study, a synergistic effect of a supercritical carbon dioxide (scCO2) acidic catalyst in combination with a heterogeneous metal oxide catalyst, specifically nickel oxide (NiO) or ceria-doped scandia-stabilized zirconia (CeScSZ), in sub- or supercritical water (sbcr/scH2O) for selective liquefaction of alkali lignin is demonstrated for the first time. The scCO2-assisted hydrothermal process in the temperature range of 100–400 °C resulted in highly selective synthesis of the phenolic monomers. On the basis of the total organic carbon (TOC) and gas chromatography–mass spectroscopy (GC–MS) analysis, it is evident that the scCO2 catalyst is essential for enhancing the reaction selectivity in the presence of a heterogeneous catalyst. A combination of homogeneous scCO2 and heterogeneous NiO catalysts resulted in the highest total relative yield of the phenolic monomers, reaching ∼97% at 200 °C. It is confirmed that the scCO2-assisted hydrothermal depolymerization of the alkali lignin in the presence of both scCO2 and a heterogeneous catalyst is superior to that of the each of these catalysts alone and in comparison of the systems where scCO2 is replaced by inert nitrogen." @default.
- W2555280960 created "2016-11-30" @default.
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- W2555280960 date "2017-01-10" @default.
- W2555280960 modified "2023-10-05" @default.
- W2555280960 title "Toward Selective Lignin Liquefaction: Synergistic Effect of Hetero- and Homogeneous Catalysis in Sub- and Supercritical Fluids" @default.
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- W2555280960 doi "https://doi.org/10.1021/acs.energyfuels.6b02128" @default.
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