4.8 Article

Photocatalytic Upgrading of Lignin Oil to Diesel Precursors and Hydrogen

Journal

ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 30, Pages 16399-16403

Publisher

WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202105692

Keywords

C-C coupling; diesel; hydrogen; lignin; photocatalysis

Funding

  1. National Natural Science Foundation of China [21872135, 22002011]
  2. China Postdoctoral Science Foundation [2020M670742]

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The study demonstrated a new method for producing diesel from lignin, utilizing photocatalysis and hydrodeoxygenation to convert biomass into renewable fuel.
Producing renewable biofuels from biomass is a promising way to meet future energy demand. Here, we demonstrated a lignin to diesel route via dimerization of the lignin oil followed by hydrodeoxygenation. The lignin oil undergoes C-C bond dehydrogenative coupling over Au/CdS photocatalyst under visible light irradiation, co-generating diesel precursors and hydrogen. The Au nanoparticles loaded on CdS can effectively restrain the recombination of photogenerated electrons and holes, thus improving the efficiency of the dimerization reaction. About 2.4 mmol g(catal)(-1) h(-1) dimers and 1.6 mmol g(catal)(-1) h(-1) H-2 were generated over Au/CdS, which is about 12 and 6.5 times over CdS, respectively. The diesel precursors are finally converted into C16-C18 cycloalkanes or aromatics via hydrodeoxygenation reaction using Pd/C or porous CoMoS catalyst, respectively. The conversion of pine sawdust to diesel was performed to demonstrate the feasibility of the lignin-to-diesel route.

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