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Kinetics of hydrogen peroxide decomposition in the presence of the tetraaquapalladium(II) complex in an aqueous solution at 40-70 °C was studied. The reaction rate is the first order with respect to the concentration of both Pd II and H 2 O 2 and the negative first order with respect to perchloric acid. Using free radicals traps, the reaction mechanism was found to differ from the traditional free radical mechanism known for d metal aqua ions and proceeds with out generation of hydroxyl radicals. The kinetic data obtained suggest a mechanism involving the formation of an intermediate palladium complex with oxygen.

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