Browsing by Author "Gal, Dezso"

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    Oxidation of 1-Phenylethanol in the Presence of Cobalt Acetylacetonates
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (10), 1977) Vasvari, Gabor; Gal, Dezso
    The oxidation of 1-phenylethanol has been investigated in the presence of Co(acac)2 and Co(acac)3. It is established that in the presence of Co(acac)2 the oxidation is preceded by the formation of a Co(acac)2—ROH complex and the fast oxidation stops abruptly due to the deactivation of the catalyst. The rate constants and the overall activation energy were determined. In the presence of Co(acac)3 the oxidation began after an induction period. It is assumed that the actual catalyst for this process is Co(acac)2. The overall activation energy has been determined.
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    Sequence Studies in Liquid Phase Hydrocarbon Oxidation Part 4: Hydroperoxide-Alcohol and Hydroperoxide-Ketone Transitions in the Oxidation of Ethylbenzene
    (Journal of the Chemical Society : Faraday Transaction - I. The Chemical Society, London. 1977, 73 (1), 1977) Danoczy, Eva; Nemes, Istvan; Gal, Dezso
    The rates of consumption of a-phcnylcthyihydroperoxide molecules during the oxidation of ethylbenzene at 120°C have been measured using radioactive tracer procedures; balance equations for the total activities and concentrations were used for the calculations. In order to obtain a coherent set of rates a hydrogen transfer reaction between hydroperoxide molecules and peroxy radicals had to be taken into account. It was established that ketone and alcohol molecules were formed mainly as a result of the induced decomposition of the hydroperoxide and the contribution to their formation by termination processes was <10 % of their total formation rates. The formation rates of alcohol and ketone via hydroperoxide molecules were very similar. The relative reactivity of hydroperoxide and ethylbenzene molecules toward peroxy radicals was found to be two. Further kinetic data, such as ease of oxidation and kinetic chain length both for the oxidation of the parent hydrocarbon and its main intermediate, have been determined.