Photothermal catalytic transfer hydrogenolysis of protolignin.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 39580480.
- Also identified by DOI 10.1038/s41467-024-54664-6 and PMC identifier 11585588.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Photothermal catalysis is a promising strategy to combine the advantages of both thermal-catalysis and photocatalysis. Herein we achieve the protolignin conversion to aromatics via the photothermal catalytic transfer hydrogenolysis process intensified by the in-situ protection strategy. The Pd/TiO<sub>2</sub> at 140 °C with UV irradiation can catalyze the reforming of primary alcohols to aldehydes and active H* species, which further participate in the acetalation protection of the 1,3-diol group of β-O-4 linkage and mediate the hydrogenolysis of C<sub>β</sub>-OAr bonds, respectively. The conversion of birch sawdust with ethanol as the hydrogen donor provides a 40 wt% yield of phenolic monomers, compared with an 11 wt% monomer yield obtained from the conversion of extracted 1,3-diol-protected lignin under the same conditions. The synergistic effect of photocatalysis and thermal-catalysis contributes to the prior cleavage of the C<sub>β</sub>-OAr bond before other C-O bonds. The feasibility of solar-light-driven photothermal catalytic system is demonstrated.