Further Understanding of the Chemistry of Manganese‐Induced Peroxide Decomposition

Manganese is the most effective catalyst for the hydrogen peroxide decomposition during peroxide bleaching used in the pulp and paper industry. We studied the chemistry involved in this project. The results showed that Mn 2+ and Mn 3+ are present during the course of the reaction. We followed the Mn 2+ and Mn 3+ concentrations during the course. It was found that a steady state of Mn 3+ concentration was attained until the hydrogen peroxide concentration was zero. At this time, the Mn 3+ concentration was maximum, then it decreased due to the disproportionation to form MnO 2 . Removal of O 2 from the system slowed down the rate of decomposition. The detailed reactions involved were discussed.