Patent ID: 7988944

Claim:
A method of decomposing a peroxide, comprising decomposing a peroxide at not lower than 45° C. and at a pH value of 1.0 to 6.5 using a peroxide decomposition catalyst, wherein the peroxide decomposition catalyst comprises a base metal atom, wherein a value A indicating a free radical generation amount represented by the (equation 1) is not more than 0.20, and a value B indicating a reaction rate represented by the (equation 2) is not less than 60; A= (Mw( S )/Mw)−1 (equation 1) wherein Mw is a weight average molecular weight of poly(sodium 4-styrenesulfonate) after a hydrogen peroxide decomposition test in the test at 80° C. in the presence of poly(sodium 4-styrenesulfonate), and Mw(S) is a weight average molecular weight of poly(sodium 4-styrenesulfonate) before the test; B=N ( po )/ N (cat) (equation 2) wherein N(po) is a mole number of hydrogen peroxide decomposed per 20 minutes in the hydrogen peroxide decomposition test in the (equation 1), and N(cat) is a mole number of a catalyst used per metal atom.