Hydrothermal process assisted by photocatalysis: Towards a novel hybrid mechanism driven glucose valorization to levulinic acid, ethylene and hydrogen

The effect of UV irradiation on titanium dioxide catalyzed glucose conversion in value added molecules was studied at high temperatures, 120–150 °C, in anaerobic conditions. The reaction was implemented in a batch reactor designed to combine high temperature/pressure and irradiation. Inhibition of t...

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Bibliographic Details
Published in:Applied catalysis. B, Environmental Environmental, 2022-05, Vol.305, p.121051, Article 121051
Main Authors: Abdouli, Insaf, Dappozze, Frederic, Eternot, Marion, Essayem, Nadine, Guillard, Chantal
Format: Article
Language:English
Subjects:
Acidity
Acids
Anaerobic conditions
Batch reactors
Catalysis
Chemical Sciences
Ethylene
Gluconic acid
Glucose
High temperature
Holes (electron deficiencies)
Hydrogen
Hydrothermal process assisted by photocatalysis
Irradiation
Levulinic acid
Titanium
Titanium dioxide
Ultraviolet radiation
Vapor phases
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Summary:The effect of UV irradiation on titanium dioxide catalyzed glucose conversion in value added molecules was studied at high temperatures, 120–150 °C, in anaerobic conditions. The reaction was implemented in a batch reactor designed to combine high temperature/pressure and irradiation. Inhibition of the titanium dioxide catalytic performances to produce gluconic acid was observed upon UV irradiation which allows the selective formation of levulinic acid in high yield, ~ 60% at 150 °C, together with the co-production of ethylene and hydrogen in the gas phase. The formation of levulinic acid could be explained by the creation of Brønsted acidity in the reaction medium upon irradiation. The reasons of this phenomenon are discussed considering that UV could modify the electronic properties of titanium dioxide by electron-holes pairs formation and the possible H+ promotion. [Display omitted] •Hydrothermal glucose transformation assisted by photocatalysis is selective in levulinic acid.•Combining hydrothermal and photocatalytic processes could create Brønsted acidity.•Hydrothermal glucose transformation assisted by photocatalysis produced H2.•Hydrothermal glucose transformation assisted by photocatalysis produced ethylene.
ISSN:0926-3373
1873-3883
DOI:10.1016/j.apcatb.2021.121051