Collect. Czech. Chem. Commun.
2000, 65, 1839-1847
https://doi.org/10.1135/cccc20001839
Temperature and Oxygen Effect on Oscillations of the Belousov-Zhabotinsky Reaction with 2-Oxopentanedioic Acid as Substrate
Daniela Balaa,b and Ľudovít Treindla,*
a Department of Physical Chemistry, Comenius University, 842 15 Bratislava, Slovak Republic
b Department of Physical Chemistry, University of Bucharest, 70346 Bucharest, Romania
Abstract
The temperature dependence of the influence of oxygen on the Belousov-Zhabotinsky (BZ) system with a Ce(IV)-Ce(III) redox catalyst and 2-oxopentanedioic acid as substrate and on the autocatalytic oxidation of Ce(III) ions with bromate was studied in detail. The influence of temperature on the induction period, the period of the second oscillation, duration and number of oscillations, and finally on the average frequency of oscillations, was investigated both in oxygen and in nitrogen. The corresponding activation parameters have been determined and discussed. The most pregnant effect of oxygen is observed on the temperature dependence of the duration and the number of oscillations. The value for enthalpy of activation is more than 50 kJ mol-1 higher in oxygen than in nitrogen. The presence of oxygen may generate chaotic behaviour or multi-mode oscillations since in the presence of oxygen, new intermediates in the BZ system are formed, thereby increasing its complexity.
Keywords: Oxygen and temperature effect; Belousov-Zhabotinsky oscillations; Autocatalytic oxidation; Ce(III) ions; Bromate; Ce(IV) ions; 2-Oxopentanedioic acid; Chaotic behaviour.
References: 32 live references.
