Mechanism of the oscillatory decomposition of hydrogen peroxide in the presence of iodate ion, iodine etc.
- 1 January 1974
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Faraday Symposia of the Chemical Society
- Vol. 9, 55-65
- https://doi.org/10.1039/fs9740900055
Abstract
Various mechanisms are constructed with the aid of information on associated reactions and tested in the light of the theory of two-variable oscillating reactions as well as by means of computer simulations. Reactions were run mainly at [HClO4]0= 0.035 to 0.080, [KIO3]0= 0.40, and [H2O2]0= 0.30 mol l.–1 and compared with computer results for a promising mechanism. Agreement is so good with respect to the induction period, the pulses of [I–] and the rate of O2 evolution, the abrupt decrease in [I2] etc. for one to conclude the mechanism to be plausible. The plausible mechanism contains HIO2, HIO, I–, H2I2O3, and H3I3O5 as intermediates and the second-order back-activation step 2HlO2+ HIO + H2O2→ 3HIO2+ H2O as the key step for the oscillation, which results from the sequence of HIO2+ HIO H2I2O3, H2I2O3 H3I3O5, and H3I3O5+ H2O2→ 3HIO2+ H2O. The oscillation source of the mechanism has been found to be in conformity with the Brusselator.Keywords
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