Lignin Conversion in Supercritical Ethanol in the Presence of Solid Acid Catalysts

Тип публикации: статья из журнала

Год издания: 2015

Идентификатор DOI: 10.1134/S0023158415040114

Ключевые слова: alkali lignin, thermal conversion, zeolite catalysts, zirconia, liquid products

Аннотация: The effects of sulfated ZrO2 and ZrO2-Al2O3 catalysts and acidic zeolite catalysts with various Si/Al ratios on the thermal conversion of alkali lignin in supercritical ethanol at 300-400A degrees C and on the composition of the resulting products have been investigated. All of the catalysts enhance lignin conversion into liquid products. The strongest effect with the catalysts based on sulfated ZrO2 is attained at 400A degrees C; with the zeolites, at 350A degrees C. The catalysts diminish the concentration of phenol and its derivatives and increase the concentration of ethers (mainly the 1,1-diethoxyethane concentration) in the liquid products. The zeolite catalysts are preferable, since the reaction over the ZrO2-containing catalysts produces gaseous compounds in higher yields. The maximum lignin conversion and a high yield of low-boiling liquid products are achieved at 350A degrees C with the zeolite catalyst with Si/Al = 30, which contains a high concentration of acid sites that are stable at elevated temperatures. The most abundant phenolic liquid products of lignin conversion over the zeolite catalysts at 350A degrees C are methoxyphenols and their methylated and ethylated derivatives.

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Издание

Журнал: KINETICS AND CATALYSIS

Выпуск журнала: Vol. 56, Is. 4

Номера страниц: 434-441

ISSN журнала: 00231584

Место издания: NEW YORK

Издатель: MAIK NAUKA/INTERPERIODICA/SPRINGER

Авторы

  • Kuznetsov B.N. (Siberian Federal University)
  • Sharypov V.I. (Siberian Federal University)
  • Chesnokov N.V. (Siberian Federal University)
  • Beregovtsova N.G. (Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences)
  • Baryshnikov S.V. (Institute of Chemistry and Chemical Technology, Siberian Branch, Russian Academy of Sciences)
  • Lavrenov A.V. (Institute of Hydrocarbons Processing, Siberian Branch, Russian Academy of Sciences)
  • Vosmerikov A.V. (Institute of Petroleum Chemistry, Siberian Branch, Russian Academy of Sciences)
  • Agabekov V.E. (Institute of Chemistry of New Materials, National Academy of Sciences of Belarus)

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