Aryl aldehydes and acids are important industrial intermediates, but their synthesis from the corresponding alcohols often requires the use of high temperatures and harmful solvents and oxidant agents. Heterogeneous photocatalysis represents an interesting option for the partial oxidation of alcohols to aldehydes at room tem-perature using water as solvent. In this work, the partial photocatalytic oxidation of 2-hydroxybenzyl alcohol (salicyl alcohol) and 4-hydroxybenzyl alcohol to the corresponding aldehydes and acids has been compared, under environmental-friendly conditions, employing TiO2 P25 as photocatalyst in water. The selectivity to the corresponding aldehydes and acids, under the same experimental conditions, was higher for 4-hydroxybenzyl alcohol than for 2-hydroxybenzyl alcohol owing to its greater stability with respect to oxidant attacks and to the lower adsorption of 4-hydroxybelzaldehyde and 4-hydroxybenzoic acid on the photocatalyst surface. The processes occurring at the oxide surface during the reaction were monitored at the molecular level by FT-IR spectroscopy under in situ UV irradiation to get deeper insights into the different behavior of the two alcohols.

Surface processes in selective photocatalytic oxidation of hydroxybenzyl alcohols by TiO2 P25

Mino, L
Last
2023-01-01

Abstract

Aryl aldehydes and acids are important industrial intermediates, but their synthesis from the corresponding alcohols often requires the use of high temperatures and harmful solvents and oxidant agents. Heterogeneous photocatalysis represents an interesting option for the partial oxidation of alcohols to aldehydes at room tem-perature using water as solvent. In this work, the partial photocatalytic oxidation of 2-hydroxybenzyl alcohol (salicyl alcohol) and 4-hydroxybenzyl alcohol to the corresponding aldehydes and acids has been compared, under environmental-friendly conditions, employing TiO2 P25 as photocatalyst in water. The selectivity to the corresponding aldehydes and acids, under the same experimental conditions, was higher for 4-hydroxybenzyl alcohol than for 2-hydroxybenzyl alcohol owing to its greater stability with respect to oxidant attacks and to the lower adsorption of 4-hydroxybelzaldehyde and 4-hydroxybenzoic acid on the photocatalyst surface. The processes occurring at the oxide surface during the reaction were monitored at the molecular level by FT-IR spectroscopy under in situ UV irradiation to get deeper insights into the different behavior of the two alcohols.
2023
Inglese
Esperti anonimi
413
113983
113983
1
FT-IR spectroscopy; Salicyl alcohol; Salicylaldehyde; Salicylic acid; Environment-friendly oxidation; Adsorption
no
1 – prodotto con file in versione Open Access (allegherò il file al passo 6 - Carica)
262
4
Bellardita, M; Escolano-Casado, G; Palmisano, L; Mino, L
info:eu-repo/semantics/article
mixed
03-CONTRIBUTO IN RIVISTA::03A-Articolo su Rivista
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2318/1904531
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