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Insight into structure-reactivity relationships for the iron-catalyzed hydrotreatment of technical lignins

Hita, I., Heeres, H. J. & Deuss, P. J., Nov-2018, In : Bioresource Technology. 267, p. 93-101 9 p.

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The viability of several technical lignins as a source for biobased platform chemicals was investigated via hydrotreatment using a cheap Fe-based limonite catalyst and without using a solvent. In general, high-quality oils (up to 29 wt% total monomers) with an average relative composition of 55% alkylphenolics and 27% aromatics were obtained. Detailed structural investigations showed that the S-G aromatic unit content of the lignins was the most important factor positively affecting overall oil yields. A second parameter was the lignocellulose processing method. Even though alkaline lignin isolation provides more recalcitrant lignins, their lower aliphaticity and methoxy group content partially limit char and gas formation. Finally, enhanced monomer yields could be obtained irrespective of the ether linkage content, and a high amount of beta-O-4 linkages actually showed a slightly negative effect on monomer yields. Overall, the results demonstrate that this route is particularly suitable for processing residual lignin streams.

Original languageEnglish
Pages (from-to)93-101
Number of pages9
JournalBioresource Technology
Volume267
Publication statusPublished - Nov-2018

    Keywords

  • Alkylphenolics, Hydrotreatment, Lignin characterization, Limonite, Technical lignins, KRAFT LIGNIN, BIO-OIL, LIGNOCELLULOSIC BIOMASS, ORGANOSOLV LIGNIN, NIMO CATALYSTS, PYROLYSIS, CHEMICALS, DEPOLYMERIZATION, RICH, FRACTIONATION

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