Reductive liquefaction of lignin to monocyclic hydrocarbons: ReS2/Al2O3 as efficient char inhibitor and hydrodeoxygenation catalyst

Pouya Sirous-Rezaei, Derek Creaser (Corresponding Author), Louise Olsson

Research output: Contribution to journalArticleScientificpeer-review

13 Citations (Scopus)

Abstract

Thermochemical processing of lignin ends up with a major problem which is the high yield of char remained from lignin conversion, causing low yields of desired products. The ReS2/Al2O3 catalyst, used in this work, exhibited a high char-suppressing potential and high hydrodeoxygenation efficiency in the reductive liquefaction of kraft lignin. Compared to NiMo/Al2O3, as a conventional sulfide catalyst, ReS2/Al2O3 showed significantly better catalytic performance with 72.4 % lower char yield, due to its high efficiency in stabilizing the lignin-depolymerized fragments. The remarkable catalytic performance of ReS2/Al2O3 is attributed to its high oxophilicity, the metal-like behavior of rhenium sulfide and sufficient acidity. The effects of reaction temperature and different catalyst supports (Al2O3, ZrO2 and desilicated HY zeolite) were also studied. In an alkali (NaOH)-assisted depolymerization of lignin, it was revealed that ReS2/Al2O3-to-NaOH (stabilization-to-depolymerization) ratio plays a crucial role in determining the reaction pathway toward either solid char residues or liquid monomeric products.

Original languageEnglish
Article number120449
JournalApplied Catalysis B: Environmental
Volume297
DOIs
Publication statusPublished - 15 Nov 2021
MoE publication typeA1 Journal article-refereed

Keywords

  • Char suppression
  • Lignin
  • Monocyclic hydrocarbon
  • Reductive liquefaction
  • ReS/AlO

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