STUDY OF KINETIC REGULARITIES OF HETEROCATALYTIC OXIDATION REACTIONS OF CHLOROHYDROCARBONS C6, C7

Authors

  • Irada M. Gasan Institute of Catalysis and Inorganic Chemistry named after academician Murtuza Naghiyev, Azerbaijan http://orcid.org/0000-0002-7906-1556
  • Arif J. Efendi Institute of Catalysis and Inorganic Chemistry named after Academician Murtuza Nagiev of the Ministry of Science and Education of Azerbaijan, Azerbaijan
  • Natavan F. Aykan Institute of Catalysis and Inorganic Chemistry named after Academician Murtuza Nagiev of the Ministry of Science and Education of Azerbaijan, Azerbaijan https://orcid.org/0000-0003-2245-7047
  • Guseyn M. Farajev Institute of Catalysis and Inorganic Chemistry named after Academician Murtuza Nagiev of the Ministry of Science and Education of Azerbaijan, Azerbaijan
  • Fuad M. Yusifov Institute of Catalysis and Inorganic Chemistry named after Academician Murtuza Nagiev of the Ministry of Science and Education of Azerbaijan, Azerbaijan https://orcid.org/0009-0003-3543-5573
  • Jeyran T. Rustamova Institute of Catalysis and Inorganic Chemistry named after Academician Murtuza Nagiev of the Ministry of Science and Education of Azerbaijan, Azerbaijan

DOI:

https://doi.org/10.15421/jchemtech.v33i3.324490

Keywords:

kinetic regularity, chlorotoluene, chlorobenzene, oxidation reaction, catalyst.

Abstract

The kinetic regularities of the oxidation reaction of chlorotoluenes and chlorobenzenes on vanadium-containing catalysts have been studied, and on this basis, methods have been developed to control the activity and selectivity of ChCs (chlorohydrocarbons) oxidation processes. It has been shown that the oxidation rate of chlorohydrocarbons gradually increases with increasing temperature and contact time. It has been established that the oxidation processes of chlorohydrocarbons proceed through parallel-consecutive reactions with the formation of chlorine and dichloromaleic anhydrides and deep oxidation products. The presence, position and number of chlorine atoms affect the direction of the oxidation reaction. It has been shown that the rate of oxidation of chlorohydrocarbons to CO2 on a fixed catalyst bed is higher than on a fluidized bed, although the rate of formation of the targeted products on a fluidized bed is higher. It has been established that both the initial chlorohydrocarbons and their oxidation products are compactly adsorbed on the surface of vanadium-phosphorous catalysts. The reaction products are stable to decomposition and have a significant effect on the oxidation kinetics of chlorohydrocarbons. It has been revealed that the main end products (CO2, MCMA, DCMA), as well as some intermediate compounds, have a modifying effect on the active centers of the catalyst increasing the rate of selective oxidation of ChCs. It has been determined that the selective catalytic oxidation of CO occurs at ratios of CO : O2 = 1 : 15 and higher, high catalysis rates are also observed at these ratios. It has been shown that during the oxidation of chlorobenzenes, MCMA and DCMA are formed, whereas during the oxidation of chlorotoluenes, chlorobenzaldehyde is also formed in addition to the above-listed compounds. The water formed in the oxidation reaction of chlorobenzenes and chlorotoluenes has a positive effect on active catalysts up to a certain concentration, modifying the active centers.

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Published

2025-10-19

Issue

Vol. 33 No. 3 (2025): Journal of Chemistry and Technologies

Section

Chemical Technology

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