Lewis-acid catalyzed depolymerization of Protobind lignin in supercritical water and ethanol

B. Güvenatam; E.H.J. Heeres; E.A. Pidko; E.J.M. Hensen

doi:10.1016/j.cattod.2015.03.041

Lewis-acid catalyzed depolymerization of Protobind lignin in supercritical water and ethanol

B. Güvenatam, E.H.J. Heeres, E.A. Pidko, E.J.M. Hensen

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Abstract

The use of metal acetates, metal chlorides and metal triflates as Lewis acid catalysts for the depolymerization of soda lignin under supercritical conditions was investigated. The reactions were carried out at 400°C in water and ethanol. Lignin conversion in supercritical water led to formation of insoluble char and resulted in low yields of monomeric products. When the reaction was performed in supercritical ethanol, char formation was inhibited and higher yields of low molecular-weight organic products were obtained. The ethanol solvent was also converted in two ways. Firstly, the lignin depolymerization products were alkylated by ethanol. Secondly, ethanol was converted into a range of higher hydrocarbons including paraffins and olefins. Possible mechanisms of the lignin and ethanol conversion reactions are discussed.

Original language	English
Pages (from-to)	460-466
Number of pages	7
Journal	Catalysis Today
Volume	259
Issue number	Part 2
DOIs	https://doi.org/10.1016/j.cattod.2015.03.041
Publication status	Published - 22 Dec 2014

Keywords

Alkylation
Depolymerization
Lewis acid
Lignin
Supercritical ethanol

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title = "Lewis-acid catalyzed depolymerization of Protobind lignin in supercritical water and ethanol",

abstract = "The use of metal acetates, metal chlorides and metal triflates as Lewis acid catalysts for the depolymerization of soda lignin under supercritical conditions was investigated. The reactions were carried out at 400°C in water and ethanol. Lignin conversion in supercritical water led to formation of insoluble char and resulted in low yields of monomeric products. When the reaction was performed in supercritical ethanol, char formation was inhibited and higher yields of low molecular-weight organic products were obtained. The ethanol solvent was also converted in two ways. Firstly, the lignin depolymerization products were alkylated by ethanol. Secondly, ethanol was converted into a range of higher hydrocarbons including paraffins and olefins. Possible mechanisms of the lignin and ethanol conversion reactions are discussed.",

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T1 - Lewis-acid catalyzed depolymerization of Protobind lignin in supercritical water and ethanol

AU - Güvenatam, B.

AU - Heeres, E.H.J.

AU - Pidko, E.A.

AU - Hensen, E.J.M.

PY - 2014/12/22

Y1 - 2014/12/22

N2 - The use of metal acetates, metal chlorides and metal triflates as Lewis acid catalysts for the depolymerization of soda lignin under supercritical conditions was investigated. The reactions were carried out at 400°C in water and ethanol. Lignin conversion in supercritical water led to formation of insoluble char and resulted in low yields of monomeric products. When the reaction was performed in supercritical ethanol, char formation was inhibited and higher yields of low molecular-weight organic products were obtained. The ethanol solvent was also converted in two ways. Firstly, the lignin depolymerization products were alkylated by ethanol. Secondly, ethanol was converted into a range of higher hydrocarbons including paraffins and olefins. Possible mechanisms of the lignin and ethanol conversion reactions are discussed.

AB - The use of metal acetates, metal chlorides and metal triflates as Lewis acid catalysts for the depolymerization of soda lignin under supercritical conditions was investigated. The reactions were carried out at 400°C in water and ethanol. Lignin conversion in supercritical water led to formation of insoluble char and resulted in low yields of monomeric products. When the reaction was performed in supercritical ethanol, char formation was inhibited and higher yields of low molecular-weight organic products were obtained. The ethanol solvent was also converted in two ways. Firstly, the lignin depolymerization products were alkylated by ethanol. Secondly, ethanol was converted into a range of higher hydrocarbons including paraffins and olefins. Possible mechanisms of the lignin and ethanol conversion reactions are discussed.

KW - Alkylation

KW - Depolymerization

KW - Lewis acid

KW - Lignin

KW - Supercritical ethanol

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DO - 10.1016/j.cattod.2015.03.041

M3 - Article

SN - 0920-5861

VL - 259

SP - 460

EP - 466

JO - Catalysis Today

JF - Catalysis Today

IS - Part 2

ER -

Lewis-acid catalyzed depolymerization of Protobind lignin in supercritical water and ethanol

Abstract

Keywords

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