Decomposition of hydrogen peroxide in a catalytic fluidized-bed reactor

The decomposition of H2O2 by a novel supported gamma-FeOOH catalyst was per formed in a continuous fluidized-bed reactor. This catalyst has been succes sfully used in the treatment of organic contaminants with H2O2 in our previ ous work. In this study, we attempted to determine the effects of pH, H2O2 concentration, and catalyst concentration on the decomposition of H2O2 An a pproach, we regarded this reactor as a continuous-flow stirred-tank reactor , was applied to investigate the kinetic behavior. At low H2O2 concentratio n, the decomposition rate of H2O2 was found to be proportional to both H2O2 and catalyst concentrations. At high H2O2 concentration, however, the rate decreased with the increasing H2O2 concentration. This can be explained by the substrate inhibition model. The large difference in the observed first -order rate constants under various pH values was also modeled. The model a greed well with the experimental results. (C) 1999 Elsevier Science B.V. Al l rights reserved.