Published February 24, 2023 | Version v1

KINETIC REGULARITIES OF ETHYLBENZENE OXIATION AND DECOMPOSITION OF a-PHENYLETHYL HYDROPEROXIDE IN THE PRESENCE OF THE CATIONIC SURFACTANT

Authors/Creators

  • 1. Institute of Catalysis and Inorganic Chemistry named after Academician M. Nagiyev, AZ-1143, Azerbaijan, Baku, H. Javid Avenue-113, Doctor of Chemical Sciences, Senior Scientific Associate

Description

Abstract

Kinetic regularities of ethylbenzene (RH) oxidation and decomposition of a-phenylethyl­hydroperoxide (ROOH) in the presence of the cationic surfactant cetyltrimethylammonium bromide (CTAB) have been studied. As the amount of decomposed hydroperoxide exceeds the surfactant amount by more than one order of magnitude, CTAB can be considered as a catalyst of hydroperoxide decomposition of  ethylbenzene oxidation.

Analysis of ethylbenzene oxidation products showed that hydroperoxide, acetophenone and methylphenylcarbinol are formed in the presence of DTAB. The estimation of temperature coefficient of decomposition rate of ROOH in the presence of DTAB gives the value of effective activation energy Eef. = 50,2 kJ/mol, which is considerably lower than the activation energy of thermal decomposition of ROOHEef= 104 kJ/mol. Cationic DTAB promotes charge separation and hydroperoxide decomposition by bond . In an oxygen atmosphere such decomposition leads to formation of peroxyl radicals and acceleration of free-radical oxidation of ethylbenzene.

The nature and scale of the influence of heterogeneity and kinetic nonuniformity of the medium, on kinetics and mechanism of ethylbenzene oxidation and decomposition of hydroperoxideetilbenzene in the presence of CPAB is revealed.

Notes

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