Effect of stirring and temperature on a Belousov-Zhabotinskii-like reaction in a batch reactor

Spatial Noise Stabilizes Periodic Wave Patterns in Oscillatory Systems on Finite Domains

“…It has long been known that impurities can facilitate the formation of target patterns in chemical systems (although such have certainly not been found at the center of every target pattern), and this work provides further numerical evidence for this. For the Belousov-Zhabotinskii reaction in the oscillatory regime, it has been demonstrated experimentally that temperature can affect the amplitude of the oscillation, with higher temperatures decreasing the amplitude [7,8]. This could then provide a method of verifying our results on inhomogeneous finite domains experimentally: In a one-dimensional reaction vessel with temporal oscillations imposed at each end, such as that used by Stössel and Münster [34], stable periodic waves could be set up.…”

Chloride Ion Inhibition, Stirring, and Temperature Effects in an Ethylacetoacetate Briggs–Rauscher Oscillator in Phosphoric and Hydrochloric Acids in a Batch Reactor

“…Until today, only subcritical (see Figure c) Hopf bifurcations have been documented in the laboratory experiments of oscillatory chemical reactions − ,, including the well-known Belousov–Zhabotinskii reaction, which exhibits bi-stability between a steady-state branch and an oscillatory-state branch in a CSTR; supercritical Hopf bifurcation (see Figure b) documented only in the theoretical models of chemical and biochemical oscillations including the reversible Sel’kov model . Ideally, a batch reactor experiment as shown in Figure a has no capability to distinguish between supercritical and subcritical Hopf-bifurcations, as no stable bifurcation parameter μ, as such in Figure , exists in this casea CSTR-experiment controlled by a stable bifurcation parameter μ is an essential requirement for obtaining this information.…”

“…11 °C) presumably predict a strong stirring effect at low temperatures (see Table 3e, Figure 6). We suggest that if the stirring effect experiments in a batch reactor were conducted at different temperatures 40,41 (not undertaken here), we could expect at least a small increase of the oscillation period 12 at high stirring in our experiments too in H 3 PO 4 media, as at low temperatures both the (slow) nonradical process time and (fast) oxidative radical process time increase more because of the Arrhenius effect.…”

26 Mechanisms of reactions in solution

“…405 Related systems using Aniline Blue, 406 vanillin, 407 diacetone, 408 or vitamin B 12 409 as substrate have been described. Additional aspects of the B^Z reaction studied include: CO 2 evolution from reactions of Ce IV and malonic or bromomalonic acids, 410 H^D isotope effects, 411 bromination of malonic, bromomalonic, tartronic and ethanetetracarboxylic acids, 412 the chemical evolution of reaction in an unstirred closed system, 413 pattern formation in continuously fed gel reactor, 414,415 differences in the effect of light and oxygen on spatiotemporal chaos, 416 mixed mode periodic oscillations, 417 £ow rate in a continuous stirred tank reactor (CSTR), 418,419 micellar, 420 stirring, 421,422 periodic vs. constant illumination 423 effects, control of chaos in a CSTR by the use of discrete non-linear perturbation feedback, 424 and the effect of oxygen. 425^427 Suppression or amplitude reduction of oscillations by illumination of the ClO 2 ^I2 ^malonic acid reaction results 428 from reduction of ClO 2 to ClO 2 À by iodine atoms which arise from photodissociation of I 2 .…”