This research paper's hypothesis is that the rate of decomposition of hydrogen peroxide (H2O2) will increase with the use of the catalysts of MnO2, PbO2, and Fe2O3, with MnO2 having the highest catalytic activity and inhibiting the fastest rate of decomposition of Hydrogen peroxide, measured with the fastest rate of oxygen production. The increase of temperature from 0°C to 90°C will enhance the rate of decomposition for each catalyst, with the most significant increase observed at 60°C and 90°C, observed in each catalyst.