Тип публикации: статья из журнала
Год издания: 2017
Идентификатор DOI: 10.1134/S2070050417020088
Ключевые слова: 13С NMR spectroscopy, acetone lignin, analysis, butanol, catalysts, chromatography mass spectrometry, conversion, liquid products, C-13 NMR spectroscopy
Аннотация: 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 haПоказать полностьюve 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. © 2017, Pleiades Publishing, Ltd.
Журнал: Catalysis in Industry
Выпуск журнала: Vol. 9, Is. 2
Номера страниц: 170-179
ISSN журнала: 20700504
Издатель: Maik Nauka Publishing / Springer SBM