Photothermal catalytic transfer hydrogenolysis of protolignin

Hongji Li (), Xiaotong Sun, Ting Li, Zhitong Zhao, Hui Wang, Xiaomei Yang, Chaofeng Zhang () and Feng Wang ()
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Hongji Li: 100 Science Avenue
Xiaotong Sun: 100 Science Avenue
Ting Li: Nanjing Forestry University
Zhitong Zhao: Taiyuan University of Technology
Hui Wang: 100 Science Avenue
Xiaomei Yang: 100 Science Avenue
Chaofeng Zhang: Nanjing Forestry University
Feng Wang: Chinese Academy of Sciences

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: 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/TiO2 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 Cβ–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 Cβ–OAr bond before other C–O bonds. The feasibility of solar-light-driven photothermal catalytic system is demonstrated.

Date: 2024
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DOI: 10.1038/s41467-024-54664-6

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