Studies on Nonlinear Kinetics for Thiourea Oxidation──H2O2-SC(NH2)2-CU2+)Reaction System

Abstract

Abstract: The reaction between hydrogen peroxide and thiourea in acidic medium(HCLO₄) catalyzed by Cu²⁺) has been studied both in a closed(batch) system and in a flow reactor (CSTR).Anew thiourea oscillator has been found.Under the batch condition the reaction displays single-peak oscillation behavior in the redox potential.Amplitude and induction time of the reaction vary as the initial reactant concentrations and the temperature of reaction.This induction time could be reduced by higher initial hydrogen peroxide concentrations and lower initial thiourea concentrations.In the CSTR, the reaction system displays sustained periodic oscillations in the potentials of Pt electrode and Cu²⁺)-selective electrode and pHelectrode, As the flow rate is decreased, complex oscillations appear.The oscillatory region is shown in phase diagrams.The oscillation behavior is related to[H₂O₂]/[SC(NH₂)₂]ratio.No bistability is observed in the system.

Key words: Chemical oscillation, Thiourea, Hydrogen peroxide

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LIN Juan-Juan, GAO Qing-Yu, MA Ke-Qin, WANG Yue-Min, ZHAO Xue-Zhuang. Studies on Nonlinear Kinetics for Thiourea Oxidation──H₂O₂-SC(NH₂)₂-CU²⁺)Reaction System[J]. Chem. J. Chinese Universities, 1996, 17(5): 739.

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Studies on Nonlinear Kinetics for Thiourea Oxidation──H₂O₂-SC(NH₂)₂-CU²⁺)Reaction System

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