Oscillatory Reaction in the Hydrogen Peroxide-Sulfite Ion-Hydrogen Ion-Hexacyanoferrate(II) Ion System in a Semibatch Reactor

1994 ◽  
Vol 98 (10) ◽  
pp. 2592-2594 ◽  
Author(s):  
Gyula Rabai ◽  
Ichiro Hanazaki
Keyword(s):  
Hydrogen Peroxide ◽  
Hydrogen Ion ◽  
Oscillatory Reaction ◽  
Semibatch Reactor ◽  
Sulfite Ion

Model for the oscillatory reaction between hydrogen peroxide and thiosulfate catalysed by copper(II) ions

1996 ◽  
Vol 92 (16) ◽  
pp. 2851-2855 ◽  
Author(s):  
Krisztina Kurin-Csörgei ◽  
Miklós Orbán ◽  
Gyula Rábai ◽  
Irving R. Epstein
Keyword(s):  
Hydrogen Peroxide ◽  
Oscillatory Reaction

APPLICABILITY OF BRAY-LIEBHAFSKY REACTION FOR CHEMICAL COMPUTING

2021 ◽  
Author(s):  
Željko Čupić ◽  
◽  
Ana I vanović Šašić ◽  
Stevan Maćešić ◽  
Slobodan Anić ◽  
...  
Keyword(s):  
Hydrogen Peroxide ◽  
Numerical Simulations ◽  
Reaction System ◽  
Dynamic State ◽  
Oscillatory Reaction ◽  
Oscillatory Reactions ◽  
Dynamic States

The first discovered homogeneous oscillatory reaction was the Bray-Liebhafsky (BL) one, described in a paper published exactly 100 years ago. However, the applicability of oscillatory reactions in chemical computing was recently discovered. Here we intend to expose the native computing concept applied to intermittent states of the BL reaction, because we believe that this particular state may have some advantages. For this purpose, numerical simulations will be used based on the known model. Sequences of perturbations will be introduced by adding iodate (IO3-) and hydrogen peroxide (H2O2), separately, as well as in various combinations with one another. It will be shown that dynamic states obtained after perturbations with same species depend very much on the sequence in which these species were used in perturbations. Additionally, it will be shown that obtained dynamic states shift the system from chaotic intermittent dynamic state to different complex periodic states. Hence, the applicability of the BL reaction system in chemical computing was demonstrated.

THE OXIDATION OF SOME DIBASIC ACIDS

1930 ◽  
Vol 3 (4) ◽  
pp. 291-305 ◽  
Author(s):  
W. H. Hatcher ◽  
W. H. Mueller
Keyword(s):  
Hydrogen Peroxide ◽  
Side Reaction ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Hydrogen Ion Concentration ◽  
Rate Of Reaction ◽  
Geometrical Isomerism

This paper gives the results obtained when hydrogen peroxide is employed to oxidize malonic, tartronic, succinic, malic, tartaric, maleic and fumaric acids. The rate of reaction for each has been determined and compared with previous findings for other compounds. The mode of oxidation suggests in each case a complex through which decomposition occurs; the rates of reaction indicate the comparability of saturated acids having the same number of carbon atoms, the constancy of mono-hydroxylization in its velocity influence, and the diverse effects of hydrogen ion concentration. The effects of geometrical isomerism and the ethylenic linkage are well-marked. The formation of peracids is to be regarded in the nature of a side-reaction in these oxidations.

scholarly journals THE DECOMPOSITION OF HYDROGEN PEROXIDE BY LIVER CATALASE

1928 ◽  
Vol 11 (4) ◽  
pp. 309-337 ◽  
Author(s):  
John Williams
Keyword(s):  
Hydrogen Peroxide ◽  
Catalytic Decomposition ◽  
Hydrogen Ion ◽  
Ion Concentration ◽  
Concentrated Solutions ◽  
Hydrogen Ion Concentration ◽  
A Value ◽  
Optimum Ph ◽  
Adsorption Of Hydrogen ◽  
New Interpretation

1. The velocity of decomposition of hydrogen peroxide by catalase as a function of (a) concentration of catalase, (b) concentration of hydrogen peroxide, (c) hydrogen ion concentration, (d) temperature has been studied in an attempt to correlate these variables as far as possible. It is concluded that the reaction involves primarily adsorption of hydrogen peroxide at the catalase surface. 2. The decomposition of hydrogen peroxide by catalase is regarded as involving two reactions, namely, the catalytic decomposition of hydrogen peroxide, which is a maximum at the optimum pH 6.8 to 7.0, and the "induced inactivation" of catalase by the "nascent" oxygen produced by the hydrogen peroxide and still adhering to the catalase surface. This differs from the more generally accepted view, namely that the induced inactivation is due to the H2O2 itself. On the basis of the above view, a new interpretation is given to the equation of Yamasaki and the connection between the equations of Yamasaki and of Northrop is pointed out. It is shown that the velocity of induced inactivation is a minimum at the pH which is optimal for the decomposition of hydrogen peroxide. 3. The critical increment of the catalytic decomposition of hydrogen peroxide by catalase is of the order 3000 calories. The critical increment of induced inactivation is low in dilute hydrogen peroxide solutions but increases to a value of 30,000 calories in concentrated solutions of peroxide.

scholarly journals Oscillatory reaction as a system detector for doped and undoped phosphate tungsten bronzes

2018 ◽  
Vol 72 (5) ◽  
pp. 275-283
Author(s):  
Tijana Maksimovic ◽  
Jelena Maksimovic ◽  
Ljubinka Joksovic ◽  
Zoran Nedic ◽  
Maja Pagnacco
Keyword(s):  
Hydrogen Peroxide ◽  
Reaction Dynamics ◽  
Organic Substrate ◽  
Linear Functions ◽  
Chemical System ◽  
Emission Spectrometry ◽  
Peroxo Complex ◽  
Oscillatory Reaction ◽  
Icp Oes ◽  
Oscillatory Period

Phosphate tungsten bronzes, obtained by thermal treatment, are insufficiently investigated bronzes and there is scarce literature data on their chemical behavior and structure. Due to high-sensitivity of the Briggs-Rauscher (BR) reaction to addition of different analytes, this oscillatory reaction presents a potentially important chemical system for investigation and characterization of phosphate-tungsten bronzes, doped and undoped. The reaction mixture for the oscillatory BR reaction typically consists of H2O2, HClO4, KIO3, Mn(II) (catalyst), and CH2(COOH)2 (malonic acid, as an organic substrate). This paper deals with phosphate tungsten bronzes (PWB) and lithium doped phosphate tungsten bronzes (LiPWB) and their effects on the Briggs-Rauscher reaction dynamics. It is shown that the addition of phosphate tungsten bronzes decreases the oscillatory period length in this reaction. Furthermore, the obtained results show that PWB has a stronger influence on the BR reaction dynamics then LiPWB. In both cases, the oscillatory period is a linear function of the added bronze mass. The obtained linear functions can be successfully used for determination of the unknown bronze mass. Furthermore, due to different slopes of these functions, the Briggs-Rauscher reaction can be used as a system-detector for lithium doped and undoped phosphate tungsten bronzes. In order to elucidate the mechanism of bronze action, the inductively coupled plasma optical emission spectrometry (ICP-OES) was used to measure the total contents of K, Mn, W, Li. The aliquots of the above solution (i.e. CH2(COOH)2, MnSO4, HClO4, KIO3 but without H2O2) with the identical masses of PWB and LiPWB were examined. For the sake of comparison, contents of the metals in the solution without the bronze addition were measured, as well. Results obtained by the ICP-OES analysis show that the bronze structure is disturbed in the strong oxidizing environment (iodate in acidic solution) so that both, tungsten and lithium, leach into the BR solution. Accordingly, the proposed mechanism of the bronze action is probably by the reaction of tungsten ion with hydrogen-peroxide resulting in formation of a tungsten-peroxo complex. This complex is a stronger oxidizing agent then hydrogen peroxide itself. Thus, formation of the tungsten-peroxo complex potentially affects the kinetics of the Briggs-Rauscher reaction.

The Autocatalytic Oxidation of Iodine with Hydrogen Peroxide in Relation to the Bray-Liebhafsky Oscillatory Reaction

2006 ◽  
Vol 71 (1) ◽  
pp. 91-106 ◽  
Author(s):  
Anna Olexová ◽  
Marta Mrákavová ◽  
Milan Melicherčík ◽  
Ľudovít Treindl
Keyword(s):  
Hydrogen Peroxide ◽  
Singlet Oxygen ◽  
Induction Period ◽  
Surface Area ◽  
Iodine Concentration ◽  
Oh Radicals ◽  
Oscillatory Reaction ◽  
Subsequent Reaction ◽  
Low Concentrations ◽  
Autocatalytic Oxidation

The oxidation of iodine with hydrogen peroxide was studied spectrophotometrically and potentiometrically. At low concentrations of HClO4, after induction period (IP), the iodine concentration decreases sigmoidally and IP decreases with decreasing surface area of the solution interphase. We assume that •OH radicals are produced via the oxidation of iodide with H2O2 and, by their subsequent reaction with H2O2, the HO2• radicals are formed. By their disproportionation, 2 HO2•  ↔   H2O2 + 1O2, very reactive singlet oxygen is produced and the oxidation of iodine can start. The described experimental results are consistent with the Noyes-Treindl mechanism.

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