Belousov-Zhabotinsky reaction

What is Belousov-Zhabotinsky reaction?

The Belousov-Zhabotinsky reaction is a chemical process that entails oxidizing an organic species (such as malonic acid) from an acidified bromate solution while a metal ion catalyst is present.

1) KBrO3
2) CH2(COOH)2 + aq. H2SO4 + KBr   —–>  oscillations
3) [Fe(phen)]2+

Various metal ions have been employed, but Ce3+/Ce4+ and [Fe(phen)]2+/[Fe(phen)]3+ are more frequently used.

Mechanism

While the reaction mechanism is currently being investigated and is notably complex, it can be partitioned into three primary reactions, as described below:

  • BrO3 + 5 Br + 6 H+       —–>   3 Br2 + 3 H2O
  • BrO3 + 4 Mred + 5H+     —–>   4 Mox + HOBr + 2 H2O
  • 2 Mox + Ma + BrMA       —–>   Br + 2 Mred + other products

References

  • A.M. Zhabotinsky, Proc. Acad. Sci., USSR, 1964, 157, 392
  • B.P. Belousov, Khim. Zhizn., 1982, 7, 65
Shares