Liquefaction of lignocellulosic biomass into phenolic monomers and dimers over multifunctional Pd/NbOPO<sub>4</sub> catalyst

Ramakrishna Jogi*, Ajaikumar Samikannu, Päivi Mäki-Arvela, Pasi Virtanen, Jarl Hemming, Annika Smeds, Chandrakant Mukesh, Torbjörn A. Lestander, Chunlin Xu, Jyri-Pekka Mikkola

*Korresponderande författare för detta arbete

Forskningsoutput: TidskriftsbidragArtikelVetenskapligPeer review

Sammanfattning

For the first time, a tandem catalytic material, 5 wt % Pd/NbOPO 4, was utilized in the depolymerization of wood in supercritical ethanol under hydrogen atmosphere. The experiments were conducted under various conditions, with fresh, and acetone extracted birch. A comprehensive analysis was performed to elucidate the dissolution efficiency and achieved product distribution. The results indicated that with fresh birch, 34 wt % of lignin monomer yield with 84 wt % delignification efficiency were obtained while with extracted wood, 35 wt % of lignin monomer yield with 78 wt % delignification efficiency were achieved. The total lignin monomer content extracted from the fresh birch is composed of 76.9 wt % of dimethoxyphenols and 16.5 wt % with the guaiacol structure. Major lignin monomer product was homosyringaldehyde (61.9 wt %). With extracted wood, 93.2 wt % of dimethoxyphenols (63.6 wt % homosyringaldehyde) and 6.8 wt % of guaiacol-monomers were achieved. It was concluded that the depolymerization occurred via breaking of the ether bonds in lignin, including ether hydrolysis by Lewis acid sites over the solid acid catalyst and with subsequent deoxygenation of monophenols over Pd. In addition, an extraction process was proposed to extract the aromatic fraction from the obtained biocrude.

OriginalspråkEngelska
Artikelnummer121148
Antal sidor12
TidskriftRenewable Energy
Volym233
DOI
StatusPublicerad - okt. 2024
MoE-publikationstypA1 Tidskriftsartikel-refererad

Fingeravtryck

Fördjupa i forskningsämnen för ”Liquefaction of lignocellulosic biomass into phenolic monomers and dimers over multifunctional Pd/NbOPO<sub>4</sub> catalyst”. Tillsammans bildar de ett unikt fingeravtryck.

Citera det här