Catalyst deactivation and reactivation during aqueous alcohol oxidation in a redox-cycle reactor

摘要

Platinum catalyst deactivation during equeious alcohol oxidation is discussed, using the eoxidation of methyl alpha-D-glucopyranoside as an example. The most important causses of paltinum deactivation are catalyst over-oxidation and catalyst poisoning. Deactivation by over-oxidation can be reversed by applying a redox-cycle, i.e., cyclic exposure to oxidative and reductive circumstances. A kinetic model for methyl alpha-D-glucopyranoside oxidation, platinum deactivation, and reactivation is presented and implemented into a three-phase stirred slurry reactor model, clcarly showing the advantages of redox-cycles.