Reaction Steps in Heterogeneous Photocatalytic Oxidation of Toluene in Gas Phase-A Review - Université de Lorraine Access content directly
Journal Articles Molecules Year : 2023

Reaction Steps in Heterogeneous Photocatalytic Oxidation of Toluene in Gas Phase-A Review

Abstract

A review of the current literature shows there is no clear consensus regarding the reaction mechanisms of airborne aromatic compounds such as toluene by photocatalytic oxidation. Potential oxidation reactions over TiO 2 or TiO 2-based catalysts under ultraviolet and visible (UV/VIS) illumination are most commonly considered for removal of these pollutants. Along the pathways from a model pollutant, toluene, to final mineralization products (CO 2 and H 2 O), the formation of several intermediates via specific reactions include parallel oxidation reactions and formation of less-reactive intermediates on the TiO 2 surface. The latter may occupy active adsorption sites and causes drastic catalyst deactivation in some cases. Major hazardous gas-phase intermediates are benzene and formaldehyde, classified by the International Agency for Research on Cancer (IARC) as Group 1 carcinogenic compounds. Adsorbed intermediates leading to catalyst deactivation are benzaldehyde, benzoic acid, and cresols. The three most typical pathways of toluene photocatalytic oxidation are reviewed: methyl group oxidation, aromatic ring oxidation, and aromatic ring opening.
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hal-04197534 , version 1 (06-09-2023)

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Yerzhigit Tulebekov, Zhandos Orazov, Bagdat Satybaldiyev, Daniel D Snow, Raphaël Schneider, et al.. Reaction Steps in Heterogeneous Photocatalytic Oxidation of Toluene in Gas Phase-A Review. Molecules, 2023, 28 (18), pp.6451. ⟨10.3390/molecules28186451⟩. ⟨hal-04197534⟩
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