The reduction reaction of dissolved oxygen in water by hydrazine over platinum catalyst supported on activated carbon fiber

The reduction reaction of dissolved oxygen (DO) by hydrazine was investigat ed on activated carbon fiber (ACF) and Pt/ACF catalysts using a batch react or with an external circulating loop. The ACF itself showed catalytic activ ity and this was further improved by supporting platinum on the ACF. While the reaction order of DO was obtained as 0.5 on both the ACF catalyst and t he Pt/ACF catalyst, that of hydrazine was observed to be 1.0 on the ACF cat alyst and 0.25 on the Pt/ACF catalyst. The catalytic role of platinum is as cribed to its acceleration of hydrazine decomposition, based on electric po tential and current measurements, as well as the kinetic study. The activat ion of oxygen may to be attributed either to ACF or platinum. (C) 1999 Else vier Science B.V. All rights reserved.