Pu + 3K2S2O8 + 6KOH → PuO3 + 6K2SO4 + 3H2O
Plutonium react with potassium persulfate and potassium hydroxide to produce plutonium(VI) oxide, potassium sulfate and water. Potassium hydroxide - diluted solution. Potassium persulfate - heated solution. In this reaction, the catalyst is can be oxide silver(I).