Abstract In the decomposition reaction of hydrogen peroxide, digital experiment confirmed that manganese dioxide participated in the chemical reaction. The mechanism of manganese dioxide catalyzing the decomposition of hydrogen peroxide was presented in stages by regulating the acidity or alkalinity of the solution. Under acidic conditions, manganese dioxide was first reduced to Mn (II) by hydrogen peroxide, and then under alkaline conditions, Mn (II) was oxidized by hydrogen peroxide to form manganese dioxide, proving that manganese dioxide actually participated in the chemical reaction as a catalyst. From a macroscopic perspective, it helps students understand the reason why a catalyst changes the rate of a chemical reaction is that it alters the reaction course, and its chemical properties change during the chemical reaction process.
WANG Xiao-Jing, LIN Qian-Nan, ZHU Cheng-Dong, DONG Shun. Exploration of Role of Manganese Dioxide in Decomposition Reaction of Hydrogen Peroxide[J]. Chinese Journal of Chemical Education, 2026, 47(3): 117-121.
