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Issue 4, 2012
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A rate law model for the explanation of complex pH oscillations in the thioureaiodatesulfite flow system

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Abstract

In a continuous flow stirred tank reactor (CSTR), the reaction of thioureaiodatesulfite (TuIS) exhibits a rich variety of complex oscillations in pH. The transitions from 1n type oscillations to 13, 12 type and simple oscillations were observed on decreasing the flow rate gradually in small steps at 30.2 °C and 20.5 °C, respectively. The transitions from 1n type oscillations to 1014, 1013 type and simple oscillations were observed as well on increasing the temperature in small steps at a given flow rate. Based on the analogous iodatesulfitethiosulfate system a simple empirical rate law model is suggested to give a sound agreement between the experimental and simulated results on the complex oscillatory behaviour. A possible explanation of the emergence of the simple empirical rate law model from the mechanism of the individual reactions of the TuIS system is also discussed.

Graphical abstract: A rate law model for the explanation of complex pH oscillations in the thiourea–iodate–sulfite flow system

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Publication details

The article was received on 18 Sep 2011, accepted on 21 Nov 2011 and first published on 12 Dec 2011


Article type: Paper
DOI: 10.1039/C2CP22972B
Citation: Phys. Chem. Chem. Phys., 2012,14, 1502-1506
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    A rate law model for the explanation of complex pH oscillations in the thioureaiodatesulfite flow system

    H. Liu, A. K. Horváth, Y. Zhao, X. Lv, L. Yang and Q. Gao, Phys. Chem. Chem. Phys., 2012, 14, 1502
    DOI: 10.1039/C2CP22972B

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