Surface-Induced Stirring Effects in the Mn-Catalyzed Belousov-Zhabotinskii Reaction with a Mixed Hypophosphite Acetone Substrate in a Batch Reactor
Document Type
Article
Publication Date
9-3-1992
Department
Chemistry and Biochemistry
School
Mathematics and Natural Sciences
Abstract
A manganese‐catalyzed Belousiv‐Zhabotinskii (BZ) reaction with a mixed hypophosphite/acetone substrate was found to be remarkable sensitive to stirring in a batch reactor. The reaction oscillated in a container with a gas/liquid interface (either air or nitrogen). However, when the reaction was stirred in a sealed flask with no interface, the system remained in the reduced state. When the slow stirring (about 100 rpm) was stopped, a pink color from Mn(III) was observed to ascend from the Teflon‐coated stir bar. When a glass stir bar was used, the system would oxidize much more slowly than with the Teflon one. A possible mechanism is considered in which bromine loss to the gas phase is crucial for oscillation. In the sealed system, oxidation occurs when the stirring is stopped because bromine can adsorb to the surface of the Teflon, allowing local oxidation which spreads throughout the system.
Publication Title
Journal of Physical Chemistry
Volume
96
Issue
18
First Page
7331
Last Page
7333
Recommended Citation
Pojman, J. A.,
Dedeaux, H.,
Fortenberry, D.
(1992). Surface-Induced Stirring Effects in the Mn-Catalyzed Belousov-Zhabotinskii Reaction with a Mixed Hypophosphite Acetone Substrate in a Batch Reactor. Journal of Physical Chemistry, 96(18), 7331-7333.
Available at: https://aquila.usm.edu/fac_pubs/6873