Malonic acid concentration as a control parameter in the kinetic analysis of the Belousov–Zhabotinsky reaction under batch conditions

2008 ◽  
Vol 10 (44) ◽  
pp. 6658 ◽  
Author(s):  
Slavica M. Blagojević ◽  
Slobodan R. Anić ◽  
Željko D. Čupić ◽  
Nataša D. Pejić ◽  
Ljiljana Z. Kolar-Anić
Keyword(s):  
Kinetic Analysis ◽  
Acid Concentration ◽  
Malonic Acid ◽  
Control Parameter ◽  
Belousov Zhabotinsky Reaction

Influence of Malonic Acid on the Corrosion and SCC Behaviour of Anodic Coated 1050 Al-Alloys

2010 ◽  
Vol 438 ◽  
pp. 155-162 ◽  
Author(s):  
Panayotis Spathis ◽  
Efthimios Papastergiadis ◽  
Georgios Stalidis ◽  
Georgios Papanastasiou
Keyword(s):  
Stress Corrosion ◽  
Acid Concentration ◽  
Malonic Acid ◽  
Stress Level ◽  
Current Density ◽  
Stress Corrosion Cracking ◽  
Corrosion Cracking ◽  
Al Alloy ◽  
Applied Potential ◽  
Protective Properties

Aim of the present work is the study of corrosion and stress corrosion cracking behaviour of 1050 Al-Alloy anodised in a 3M H2SO4 anodising bath with the presence in it of malonic acid, in various concentrations and anodising current densities. The investigation was carried out by SCC (Stress Corrosion Cracking) tests and electrochemical measurements. The influence of applied potential on SCC behaviour was also examined. The corrosion and SCC behaviour of anodised 1050 Al-Alloy was found to vary with malonic acid concentration, anodising conditions, applied potential and stress level. In SCC conditions all prepared coatings protected the bare alloy, with better protective properties in the case of 0.015M concentration of malonic acid prepared with a 6 A.dm-2 anodising current density. The coating prepared in these conditions had better mechanical properties as indicated from the increased protection at a high stress level and also the better behaviour in corrosion, without stress, conditions of coatings prepared in different conditions of malonic acid concentration and anodising current density. For the interpretation of the results, properties of the anodic coatings as thickness, packing density, coating ratio, roughness, were also studied. The anodic coating formed in a electrolytic bath of 0.015M concentration of malonic acid and a 6 A.dm-2 anodising current density was found to be less porous, more compact and rough, with better oxide structure. Prepared coatings were found to increase protective properties in an area of applied potentials slightly more anodic than the free corrosion potential values.

scholarly journals New evidence of transient complex oscillations in a closed, well-stirred belousov-zhabotinsky system

2006 ◽  
Vol 71 (6) ◽  
pp. 605-612 ◽  
Author(s):  
Ljiljana Kolar-Anic ◽  
Slavica Blagojevic ◽  
Natasa Pejic ◽  
Nebojsa Begovic ◽  
Stevan Blagojevic ◽  
...  
Keyword(s):  
Experimental Evidence ◽  
Malonic Acid ◽  
Batch Reactor ◽  
One Dimensional ◽  
Transient Complex ◽  
One Dimensional Maps ◽  
New Evidence ◽  
Belousov Zhabotinsky Reaction ◽  
Influence Of Noise

Some new experimental evidence of complex irregular oscillations in the Belousov-Zhabotinsky reaction realized in a batch reactor is presented. The results were obtained under relatively low cerium and malonic acid concentrations. One-dimensional maps were used for general discussion, and particularly, for the influence of noise on the evolution of the oscillations.

Temperature influence on the malonic acid decomposition in the Belousov-Zhabotinsky reaction

2009 ◽  
Vol 83 (9) ◽  
pp. 1496-1501 ◽  
Author(s):  
S. M. Blagojević ◽  
S. R. Anić ◽  
Ž. D. Čupić ◽  
N. D. Pejić ◽  
Lj. Z. Kolar-Anić
Keyword(s):  
Malonic Acid ◽  
Temperature Influence ◽  
Acid Decomposition ◽  
Belousov Zhabotinsky Reaction

Oxidation of Malonic Acid by Ceric Ions Subset of the Belousov-Zhabotinsky Reaction

1987 ◽  
Vol 42 (9) ◽  
pp. 963-969 ◽  
Author(s):  
H.D. Försterling ◽  
R. Pachl ◽  
H. Schreiber
Keyword(s):  
Sulfuric Acid ◽  
Malonic Acid ◽  
Reaction Rate ◽  
Primary Source ◽  
Acid Solutions ◽  
Bz Reaction ◽  
Sulfuric Acid Solutions ◽  
Belousov Zhabotinsky Reaction ◽  
Kinetics Of

The kinetics of the Ce4+-decay and the formation of CO2 are measured in sulfuric acid solutions of malonic acid. The reaction rate is slowed down by Ce3+ -ions due to a reaction of Ce3+ with malonic acid radicals. The primary source of CO2 is the decarboxylation of malonic acid radicals. Implications on the mechanism of the BZ reaction are discussed.

The Mn(II)-Catalyzed Belousov-Zhabotinsky Reaction with Methyl-, Ethyl- or Butyl-Malonic Acid

1994 ◽  
Vol 41 (6) ◽  
pp. 651-658 ◽  
Author(s):  
Shih Sheng Sun ◽  
Hong-Ping Lin ◽  
Ying-Fen Chen ◽  
Jing-Jer Jwo
Keyword(s):  
Malonic Acid ◽  
Methyl Ethyl ◽  
Belousov Zhabotinsky Reaction

The Autocatalytic Reduction of Ferriin by Malonic Acid with Regard to the Ferroin-Catalyzed Belousov-Zhabotinsky Reaction

2003 ◽  
Vol 68 (1) ◽  
pp. 23-34 ◽  
Author(s):  
Marta Mrákavová ◽  
Milan Melicherčík ◽  
Anna Olexová ◽  
Ľudovít Treindl
Keyword(s):  
Reaction Mechanism ◽  
Redox Potential ◽  
Time Dependence ◽  
Malonic Acid ◽  
Anaerobic Conditions ◽  
A Value ◽  
Probable Reaction Mechanism ◽  
Probable Reaction ◽  
Last Stage ◽  
Belousov Zhabotinsky Reaction

The reduction of ferriin ([Fe(phen)3]3+, phen = 1,10-phenanthroline) by malonic acid (MA) differs from the reduction of Ce(IV) or Mn(III) ions by MA in its autocatalytic character and in a pregnant influence of oxygen, which behaves obviously as a catalyst. The time dependence of the ferroin-ferriin redox potential at the last stage of this reaction has a sigmoidal shape, which indicates autocatalysis. Under anaerobic conditions, the inflection time is of the order of several tens of minutes, since autocatalysis cannot proceed unless a sufficient amount of oxygen is produced via oxidation of water (OH- ions) with Fe(IV) formed by the ferriin dismutation. Under aerobic conditions, the inflection time decreases to a value of a few seconds. The probable reaction mechanism is discussed in detail.

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