DIRECT OXIDATION OF AROMATIC COMPOUNDS BY OXYGEN IN BARRIER DISCHARGE PLASMA
Abstract
Direct one-stage oxidation of aromatic compounds (benzene, toluene, cumene and mixtures of benzene with toluene, naphthalene) by oxygen at a temperature of 20 °C in a plasma chemical reactor with barrier discharge under conditions of effective ejection of reaction products from the reactor. The oxidation products of benzene are phenols and diatomic phenols (mainly hydroquinone and pyrocatechol), during the oxidation of toluene, cresols (mainly ortho- and para-isomers), benzaldehyde and benzyl alcohol, cumene – acetophenone, dimethylphenylcarbinol, benzaldehyde, benzoic acid are mainly formed. During the oxidation of cumene, iso-propylphenols – phenol homologues – were not detected. The oxidation of aromatic hydrocarbons in mixtures occurs independently of each other. Upon oxidation of the benzene-toluene mixture, both benzene derivatives (phenol, hydroquinone, pyrocatechol) and toluene (cresols, benzaldehyde, benzyl alcohol) are formed. During the oxidation of a mixture of benzene and naphthalene, no naphthalene oxidation products were found, mainly phenol, hydroquinone, and pyrocatechol are formed. Based on the results obtained and the information available in the literature on the oxidation of hydrocarbons of various structures in a low-temperature plasma of a barrier discharge, an assumption is proposed about the general mechanism of the oxidation process. It is shown that two main directions can be distinguished in the mechanism of the oxidation of aromatic hydrocarbons in the plasma of a barrier discharge with oxygen: the direct interaction of atomic oxygen with an aromatic ring with the formation of phenolic compounds; and the interaction of atomic oxygen with side alkyl substituents. Based on the proposed scheme, it was possible to explain the distribution of the oxidation products of the initial aromatic hydrocarbons obtained in experiments. The expediency of controlling the oxidation conditions of hydrocarbons to control the composition of their single-stage oxidation products in a barrier discharge plasma is substantiated.
For citation:
Ochered'ko A.N., Kudryashov S.V., Ryabov A.Yu., Leshchik A.V. Direct oxidation of aromatic compounds by oxygen in barrier discharge plasma. ChemChemTech [Izv. Vyssh. Uchebn. Zaved. Khim. Khim. Tekhnol.]. 2025. V. 68. N 8. P. 119-125. DOI: 10.6060/ivkkt.20256808.16t.
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