Continuous measurements of gaseous oxygen production in Bray-Liebhafsky oscillatory reaction and its correlation with the reaction mechanism

Abstract

• Experimental setup for evolved oxigen monitoring was constructed. • Bray-Liebhafsky reaction was investigated at 2 mixing rates in 5 replicates. • Lower mixing rate preserve higher content of dissolved gas. • Lower stirring facilitate oscillatory evolution. • Heterogeneous effects assist in triggering iodine oxidation. Upgraded design of the experimental setup for monitoring Bray-Liebhafsky (BL) oscillatory reaction dynamics allowed simultaneous recording of platinum electrode potential and gaseous pressure changes over time. Experiments were performed at two stirring rates (600 rpm and 1200 rpm) in five replicates. Evolved gas at two mixing rates is correlated with reaction induction period, number of oscillations, period between oscillations, oscillation amplitude and number of produced oxygen moles per oscillation. Obtained trends indicate that the amount of formed gas facilitates initiation of iodine oxidation. Results are in agreement with previous findings which point to the importance of heterogeneous effects in reaction of iodine oxidation.