New phenomena of H_2O_2-KSCN-CuSO_4-NaOH nonlinear chemical reaction in a batch reactor
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In order to spread more applications, decomposition characteristics of hydrogen peroxide (H2O2) in sodium hydroxide (NaOH) solution were investigated in this paper. Research results indicate that the attack of charged particles such as OH- and HO2- leads to H2O2 decomposition. HO2¬- is vital reactive intermediate, which was mainly from neutral reaction of H2O2 with NaOH. The decomposition is considered as pseudo-two-order kinetics, and the reaction rate constant depended on decomposition temperature and solution pH. The apparent average activation energy is 51.92 kJ•mol-1 when the initial NaOH concentration is 1mol•L-1 and solution pH is 10.5.
Sodium hydroxide
Chemical decomposition
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ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTKinetic Modeling of the KMnO4/H2C2O4/H2SO4 Reaction: Origin of the bistability in a CSTRV. Pimienta, D. Lavabre, G. Levy, and J. C. MicheauCite this: J. Phys. Chem. 1995, 99, 39, 14365–14371Publication Date (Print):September 1, 1995Publication History Published online1 May 2002Published inissue 1 September 1995https://pubs.acs.org/doi/10.1021/j100039a025https://doi.org/10.1021/j100039a025research-articleACS PublicationsRequest reuse permissionsArticle Views506Altmetric-Citations15LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InRedditEmail Other access options Get e-Alerts
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A self-accelerating oxidation of an unbuffered aqueous sodium sulfite−hydrogen sulfite solution by sodium bromate and a selective removal of the hydrogen ion by solid marble chips from the reaction mixture have been used to construct an oscillatory system. The system exhibits large-amplitude oscillations between pH 3.5 and 7.5 at 25.0 °C in a continuous-flow stirred tank reactor and in a semibatch configuration. The shape, the periodic time (from 10 min to 2 h), and the region of oscillations can be controlled by using different amounts and grade size of marble. A simple reaction scheme, consisting of the protonation equilibria of SO32- and HSO3-, the oxidation of HSO3- and H2SO3 by BrO3-, and a removal of H+ by the CaCO3 in marble in the form of HCO3- has successfully been used to simulate the observed dynamical behavior.
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The tyrosine-acetone-bromate-Ce~(4+)-H_2SO_4 Belousov-Zhabotinskii reaction system is investigated by calorimetry method in a closed system.The outstanding feature of this system is that both organic substrates(tyrosine and acetone) can be brominated.The effects of the initial concentrations of reactants and temperature on the oscillation parameters(induction time,oscillation period and heat released in the induction time) are studied.In this system,for the regeneration of Br~-,two pathways are taken into account:One is by the oxidation of bromotyrosine with the metal-ion catalyst(Ce~(4+));The other is by the hydrolysis of molecular Br_2.A mixed model has been proposed,which consists of 17 reactions based on the reversible Oregonator model and the bromine hydrolysis controlled(BHC) model.The numerical simulation results give an agreement with experimental behaviors.It proves the mixed model reasonable.
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Induction period
Oscillation (cell signaling)
Belousov–Zhabotinsky reaction
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Induction period
Triiodide
Reaction rate
Oscillation (cell signaling)
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In recent years,nonlinear chemical reactions,mechanisms and complex phenomena inunhalogen aqueous reaction systems have attracted much attention.Jesen oscillator andsulfide-sulfite-oxygen-methylene blue oscillator aroused great interest in nonlinear reactionsystems without halogen.Later,hydrogen peroxide-thiocyanate-copper sulfate reaction wasdesigned to display bistability and oscillation.According to the experimental results at that
Thiocyanate
Bistability
Potassium thiocyanate
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Peroxide
Oscillation (cell signaling)
Reaction rate
Briggs–Rauscher reaction
Batch reactor
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We present a novel measurement technique to study an oscillating chemical reaction using a new class of sensor, viz. a pulsating sensor developed in-house. A halogen-free oscillating chemical reaction in the Cu(II)-catalyzed H2O2-KSCN–NaOH system reported by Orban was chosen to examine the performance of this technique. Shift in potential during the oscillating reaction was captured online with high precision and excellent resolution using this simple but high-performance pulsating potentiometric measurement technique. In this work, the influence of bath temperature and flow rate of reagents on the Cu(II)-catalyzed H2O2–KSCN–NaOH oscillating chemical reaction is investigated to optimize the conditions for rapid oscillations. This, in turn, helps to evolve analyte pulse perturbation techniques for rapid assay of hydrazine, uranium(VI), and sodium thiosulfate in aqueous solutions using the above oscillating reaction. © 2012 Wiley Periodicals, Inc. Int J Chem Kinet 45: 19–29, 2013
Briggs–Rauscher reaction
Thiocyanate
Hydrazine (antidepressant)
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Sodium thiocyanate
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