MnO2 showed the highest catalytic activity across all temperatures, significantly increasing the rate of hydrogen peroxide decomposition. This is evident from the highest volumes of oxygen produced, particularly at 90°C. PbO2 exhibited moderate catalytic activity. It accelerated the decomposition reaction, but not as effectively as MnO₂. The oxygen volumes produced were lower than MnO₂ but higher than Fe₂O₃ across all temperatures. Fe2O3 was the least effective catalyst, producing the lowest volumes of oxygen at each temperature, indicating a slower reaction rate.