COMPLEX DYNAMICAL BEHAVIOR IN THE OXIDATION OF HYDROXYLAMINE BY BROMATE

Complex dynamical behavior has been observed in the oxidation of hydro xylamine by bromate in acidic sulfate. The reaction shows clock type k inetics in closed conditions and an aperiodic oscillations if gaseous products are removed from the system with a constant flow-rate. The re duction kinetics of bromate ions with excess hydroxylamine has been st udied in the presence of allyl alcohol. The observed pseudo-first-orde r rate constant k(obs) has been found to follow the expression k(obs) = kK1[H+][hydroxylamine]/(1 + K1[H+])K2 where [hydroxylamine] is total initial hydroxylamine concentration, K1 = 0.5 M-1, K2 = 10(6) M-1, an d k - 2.57 X 10(3) M-1 s-1 at 298.15 K and I = 2.0 M. The rate constan t for the bromine oxidation of hydroxylamine in sulfuric aqueous solut ion has been determined. (C) 1994 john wiley & sons, inc.