Nonlinear chemical reaction between Na2S2O3 and Peroxide compound |
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Authors: | Qingyu Gao Yaomin Wang Guichang Wang Songlin Zhang Yaru Zang Xuezhuang Zhao |
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Institution: | (1) Department of Chemistry, Nanki University, 300071 Tianjin, China |
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Abstract: | Kinetics of reaction between Na2S203 and peroxide compound (H202 or Na2S2O3) in a batch reactor and in a continuous stirring tank reactor (CSTR) were studied. Steady oscillations in uncatalyzed reactions
in a CSTR were first discovered. In Na2S203-H2O2-H2S04 reaction system, Pt potential and pH of higher and lower flow rates beyond oscillation flow rates were in around the
same extreme values. The reaction catalyzed by Cu2+ consists of the catalyzed oscillation process and the uncatalyzed osciliation one. On the basis of experiment, a reaction
mechanism consisting of three stages was put forward. The three stages are H+ positive-feedback reactions, proton negative-feedback (uncatalyzed negative-feedback and catalyzed negative-feedback) reactions
and transitional reactions. The mechanism is able to explain reasonably the nonlinear chemical phenomena appearing in the
thiosulfate oxidation reaction by peroxide compounds.
Project supported by the National Natural Science Foundation of China. |
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Keywords: | sodium thiosulfate nonlinearity reaction mechanism kinetics model |
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