The dynamics of the bromate-1,4-cyclohexanedione reaction and its ferroin catalyzed version in a continuously fed stirred tank reactor are reported. In the ([Br-](0), [H2SO4](0)) and ([Br-](0), [ferroin](0)) planes steady-state bistability and oscillations are observed. Close to the upper [Br-](0) limit of the oscillatory domain the oscillations become aperiodic. By increasing the [ferroinio the characteristic of the oscillations switches from 'uncatalyzed' to 'catalyzed'-type. Additionally, the effects of the bromide ions and ferroin on the batch dynamics are investigated. (c) 2006 Elsevier B.V. All rights reserved.