Abstract
Existing and emerging technologies for the chemical processing of wood are mainly aimed at transforming its cellulose component into target products. In these processes, lignin is produced on a large scale as a waste product, but there are no advanced ways of processing it. This work investigates the effect NiCuМо/SiO2 catalysts have on the thermal transformation of acetone lignin in supercritical butanol at temperatures of 280, 300, and 350°C. The resulting liquid products are studied via gas–liquid chromatography mass spectrometry, and 13С NMR spectroscopy. It is found that butanol undergoes almost no thermochemical conversions at temperatures below 300°C. Catalysts raise its level of conversion to 36–40 wt %. Under the effect of NiCuМо/SiO2 catalysts, the yield of hexane-soluble products of acetone lignin thermal conversion at 300°C increases by a factor of 2.4, while the yield of solid residue falls by approximately a factor of 3.3. Catalysts reduce the relative content of methoxyphenols in hexane-soluble products: the content of syringol in particular falls by a factor of 14. According to 13С NMR spectroscopy, the catalytic transformation of acetone lignin to liquid acetone-soluble products is accompanied by the breaking of β–О–4 chemical bonds between the structural fragments of lignin and a reduction in the content of methoxyl groups, primarily in the syringyl structural units of the resulting products.
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Original Russian Text © V.I. Sharypov, B.N. Kusnetsov, V.A. Yakovlev, N.G. Beregovtsova, S.V. Baryshnikov, 2017, published in Kataliz v Promyshlennosti.
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Sharypov, V.I., Kusnetsov, B.N., Yakovlev, V.A. et al. Studying the thermal conversion of acetone lignin in supercritical butanol in the presence of NiCuMo/SiO2 catalysts. Catal. Ind. 9, 170–179 (2017). https://doi.org/10.1134/S2070050417020088
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DOI: https://doi.org/10.1134/S2070050417020088