Reductive liquefaction of lignin to monocyclic hydrocarbons: ReS2/Al2O3 as efficient char inhibitor and hydrodeoxygenation catalyst
Journal article, 2021

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.

Reductive liquefaction


Char suppression

ReS /Al O 2 2 3

Monocyclic hydrocarbon


Pouya Sirous Rezaei

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Derek Creaser

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Louise Olsson

Chalmers, Chemistry and Chemical Engineering, Chemical Technology

Applied Catalysis B: Environmental

0926-3373 (ISSN) 1873-3883 (eISSN)

Vol. 297 120449

Combining experiments and kinetic modelling for lignin valorization to chemicals and fuels

Formas (2017-01392), 2018-01-01 -- 2020-12-31.

Lignin depolymerization to fuel components by catalytic hydrotreatment

Swedish Energy Agency (47511-1), 2019-01-01 -- 2022-12-31.

Subject Categories

Chemical Process Engineering

Other Chemical Engineering




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