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The kinetics and mechanism of oxidation of isopropanol with the hydrogen peroxide-vanadate ion-pyrazine-2-carboxylic acid system

  • Chemical Kinetics and Catalysis
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Abstract

The vanadate anion in the presence of pyrazine-2-carboxylic acid (PCA) was found to effectively catalyze the oxidation of isopropanol to acetone with hydrogen peroxide. The electronic spectra of solutions and the kinetics of oxidation were studied. The conclusion was drawn that the rate-determining stage of the reaction was the decomposition of the vanadium(V) diperoxo complex with PCA, and the particle that induced the oxidation of isopropanol was the hydroxyl radical. Supposedly, the HO· radical detached a hydrogen atom from isopropanol, and the Me2 C· (OH) radical formed reacted with HOO· to produce acetone and hydrogen peroxide. The electronic spectra of solutions in isopropanol and acetonitrile and the dependences of the initial rates of isopropanol oxidation without a solvent and cyclohexane oxidation in acetonitrile on the initial concentration of hydrogen peroxide were compared. The conclusion was drawn that hydroxyl radicals appeared in the oxidation of alkanes in acetonitrile in the decomposition of the vanadium diperoxo complex rather than the monoperoxo derivative, as was suggested by us earlier.

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Original Russian Text © V.B. Romakh, Yu.N. Kozlov, G. Suss-Fink, G.B. Shul’pin, 2007, published in Zhurnal Fizicheskoi Khimii, 2007, Vol. 81, No. 8, pp. 1389–1397.

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Romakh, V.B., Kozlov, Y.N., Süss-Fink, G. et al. The kinetics and mechanism of oxidation of isopropanol with the hydrogen peroxide-vanadate ion-pyrazine-2-carboxylic acid system. Russ. J. Phys. Chem. 81, 1221–1229 (2007). https://doi.org/10.1134/S0036024407080080

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  • DOI: https://doi.org/10.1134/S0036024407080080

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