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Updated: Jun 12, 2026

Reaction Kinetics and Combustion Dynamics of I4O9 and Aluminum Mixtures
Published on: November 7, 2016
Oxygen-sulfur species distribution and kinetic analysis in the hydrogen peroxide-thiosulfate system
Yongchao Lu1, Qingyu Gao, Li Xu
1College of Chemical Engineering, China University of Mining and Technology, Xuzhou 221008, China.
Abstract:
We have carried out species determination and kinetic analysis in the hydrogen peroxide-thiosulfate reaction by means of capillary electrophoresis and high performance liquid chromatography. In addition to thiosulfate, dithionate, trithionate, and tetrathionate, other polythionates such as pentathionate and hexathionate were detected during the oxidation process. The polythionates found are sensitive to the pH, with the average length of the sulfur chain decreasing with increasing pH. By varying the pH and the concentrations of the reactants, we find that the reaction is first order with respect to each of the reactants with rate constant k = 0.025 M(-1) s(-1). With HOS(2)O(3)(-), HSO(3)(-)/SO(3)(2-), S(3)O(6)(2-), S(4)O(6)(2-), and S(5)O(6)(2-) as key intermediates that are eventually oxidized to sulfate, a proposed 14-step kinetic model simulates the reaction process, including the evolution of the thiosulfate and tetrathionate concentrations at various pHs.
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