title: Modelling complex transient oscillations for the BZ reaction in a batch reactor.
abstract: The recent observations of transient complex oscillations in the Belousov-Zhabotinsky (BZ) reaction in a batch reactor are confirmed and an attempt is made to model this behavior using the Gyorgyi-Field mechanism (an extension of the classic Field-Koros-Noyes model). It is seen that the concentration of bromomalonic acid plays an important role, acting somewhat like a "slowly-varying parameter," causing the system to sweep through a region of oscillatory response even in the absence of reactant consumption. Complex behavior is not observed in the model if the usual "pre-equilibrium" assumption in made for the intermediate species BrO(2) but does arise if a full steady-state approximation is applied to this radical. These results may bring into question some assumptions made in the usual treatment of the cerium-catalyzed BZ system in closed reactors. (c) 1997 American Institute of Physics.
authors.affiliation: School of Chemistry, University of Leeds, Leeds, LS2 9JT, United Kingdom.
authors.forename: Barry R.
authors.initials: BR
authors.lastname: Johnson
authors.forename: Stephen K.
authors.initials: SK
authors.lastname: Scott
authors.forename: Barnaby W.
authors.initials: BW
authors.lastname: Thompson