Determination by reactive absorption of the rate constant of the ozone reaction with the hydroperoxide anion

Pierre-François Biard; Thom Dang; Annabelle Couvert

doi:10.1016/j.cherd.2017.09.004

Determination by reactive absorption of the rate constant of the ozone reaction with the hydroperoxide anion

Pierre-François Biard ¹ Thom Dang Annabelle Couvert ¹

1 ISCR - Institut des Sciences Chimiques de Rennes

Abstract : The reaction rate constant between the hydroperoxide anion (HO2−) and molecular ozone was evaluated from the reactive absorption method in the range of temperature from 20 to 35 °C. This reaction is crucial in the initiation step of the ozone decomposition, especially using the peroxone process which combines ozone and hydrogen peroxide in solution. A stirred-cell operated semi-continuously was used for this purpose. A high initial concentration of tert-butanol (0.05 mol L−1) was applied to efficiently scavenge all radicals and to avoid any parasite reaction. Based on the dissolved H2O2 concentration decreasing and the outlet ozone concentration time-course, the stoichiometry of the initiation reaction was determined, with one mol of H2O2 consumed per mol of ozone transferred. The chemical conditions were thoroughly selected to reach a fast pseudo-first order absorption regime. The reaction rate constant increased from 1.91 × 106–2.40 × 106 L mol−1 s−1 at 20 °C to 5.68 × 106–7.31 × 106 L mol−1 s−1 at 35 °C.

Keywords : activation energy Reactive absorption ozone hydrogen peroxide initiation rate constant

Type de document :

Article dans une revue

Chemical Engineering Research and Design, Elsevier, 2017, 127, pp.62-71. 〈10.1016/j.cherd.2017.09.004〉

Domaine :

Chimie / Chimie théorique et/ou physique

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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01652337
Contributeur : Christelle Allard <>
Soumis le : jeudi 30 novembre 2017 - 11:10:45
Dernière modification le : vendredi 25 mai 2018 - 01:27:24

Biard et al. - 2017 - Determin...

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