Effect of Oxygen on the Belousov−Zhabotinsky Reaction at Low Cerium Concentrations

Petrascu, Anca-Maria; Koch, Michel H. J.; Försterling, Horst‐Dieter

doi:10.1021/jp9905272

Cited by 10 publications

(11 citation statements)

References 27 publications

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“…As another way to change the molarity of cerium (IV), or consequently Z , oxygen aeration can be introduced into the reactor. It has been reported, based on experiments, that oxygen aeration reduces the cerium (IV) ion concentration and increases the oscillation period, or can even eliminate the oscillations . Applying this approach, the liquid phase volume does not change and thus our mathematical model, i.e.…”

Section: Discussionmentioning

confidence: 99%

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Feedback control strategies for a cerium‐catalyzed Belousov–Zhabotinsky chemical reaction system

et al. 2015

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A number of control schemes including nonlinear feedback, dislocated feedback, and speed feedback have been proposed and assessed for a bromate-malonic acid-cerium Belousov-Zhabotinsky batch reaction process. The tuning parameters of the Oregonator model were firstly adjusted based on a UV-vis spectrophotometric analysis in the experimental part of the research. The adjusted Oregonator model successfully reproduced the innate induction time and periodicity of the BZ-batch system. Subsequently, the controllers were implemented and numerical simulations were carried out by employing the multi-stage Adomian decomposition method. The nominal analysis method was used to study the linear stability of each design. All the controlled systems were found to be linearly stable for certain continuous regions of controller gain. The performance of the proposed control laws was assessed and the dislocated feedback control strategy was shown to be able to drive the system states toward desired setpoints quickly. Furthermore, the validity of the dislocated feedback control design was doubly ensured by the sliding mode control theory. It was found that those feedback schemes which manipulate cerium ion concentration can be practically realized by means of electrochemical oxidation or oxygen aeration. Our results were confirmed by the Simulink software package and the block diagram representations are included in the paper.

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Section: Discussionmentioning

confidence: 99%

“…It has been reported, based on experiments, that oxygen aeration reduces the cerium (IV) ion concentration and increases the oscillation period, or can even eliminate the oscillations. [59] Applying this approach, the liquid phase volume does not change and thus our mathematical model, i.e. the batch reactor, remains valid.…”

Section: Discussionmentioning

confidence: 99%

Feedback control strategies for a cerium‐catalyzed Belousov–Zhabotinsky chemical reaction system

et al. 2015

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“…[1][2][3][4][5][6] The inhibitory effect of oxygen has already been reported shortly after the development of the Field-Körös-Noyes (FKN) mechanism 7 and confirmed the assumption of a free-radical mechanism. 8 A decreasing sensitivity of the BZ reaction toward oxygen with increasing acidity was discussed.…”

Section: Introductionmentioning

confidence: 85%

Oxygen Inhibition of Oscillations in the Belousov−Zhabotinsky Reaction

2000

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The inhibitory effect of molecular oxygen on chemical oscillations in a semiclosed Belousov-Zhabotinsky system is investigated. Comparison of experimental results obtained from anaerobic and aerobic reactions shows that the oxygen-induced increase of oscillation periods is most pronounced at low concentrations of sulfuric acid or bromate and at high concentrations of malonic acid. Under the given experimental conditions, oxygen inhibition is negligible Based on the classical Oregonator, we propose an extended model that accounts for the observed concentration dependencies. This model treats oxygen as a dynamic variable and is capable of describing oxygen oscillations as well as the striking increase in oxygen concentration for conditions in which oscillations are fully suppressed. The rate equations of the extended Oregonator model are presented in a dimensionless form and are, for anaerobic conditions, in exact correspondence to the classical model.

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“…One of the main dynamical behaviour before occurring the oscillations in the cerium-catalyst BZ reaction is the induction period, which can be observed in many types of the BZ system [6][7][8][9][10][11][12][13][14][15][16][17][18][19] . In the classical BZ reaction, the induction period is explained by the time required for the brominated organic products to accumulate, e.g., bromomalonic acid needs to reach a crucial concentration for the onset of oscillations 6,8,10 .…”

Section: Introductionmentioning

confidence: 99%

“…Induction period can be shortened or suppressed by the addition of bromomalonic acid and the concentration of chloride ion is one parameter that can lengthen the induction period 7 . Other parameters that can enhance the length of induction period are the oxygen 11 , acetonitrile 12 , and AgNO 3 concentrations 12 . The lengthening of induction period can also be observed, when methyl ketones were added [14][15][16] .…”

Section: Introductionmentioning

confidence: 99%

Effect of bromide concentration on the induction period of the cerium-catalysed Belousov-Zhabotinsky oscillating reaction

Panplado¹,

Intasri²,

Sirimungkala³

et al. 2018

ScienceAsia

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Temporal oscillations of the cerium(IV)-catalysed Belousov-Zhabotinsky reaction under addition of various Brconcentrations are investigated. The relationship between the induction period and Brconcentration, which is a controlling species in the BZ oscillating reaction, is reported. The oscillations of the Ce(IV) catalyst are followed by using UV-Vis spectrophotometric methods under closed batch and oxygen free systems. Experimental observations demonstrate that increasing Brconcentration decreases the induction period exponentially, whereas it increases the oscillation period linearly. The results reveal that the oscillations without induction period are observed by the addition of 1.0 × 10 −2 M Brconcentration. Addition of Brinto the BZ solution mainly involves the process A of the FKN mechanism. Numerical results reveal that the addition of Brincreases the production of BrMA, but decreases the induction period.

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Effect of Oxygen on the Belousov−Zhabotinsky Reaction at Low Cerium Concentrations

Cited by 10 publications

References 27 publications

Feedback control strategies for a cerium‐catalyzed Belousov–Zhabotinsky chemical reaction system

Feedback control strategies for a cerium‐catalyzed Belousov–Zhabotinsky chemical reaction system

Oxygen Inhibition of Oscillations in the Belousov−Zhabotinsky Reaction

Effect of bromide concentration on the induction period of the cerium-catalysed Belousov-Zhabotinsky oscillating reaction

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