Catalytic union of H2 and O2 to get H2O2 is found in
Electrolysis of 50% H2SO4
Electrolysis of aqueous solution of (NH4)2SO4 + H2SO4
Treating BaO2 with cold and dilute H2SO4
Auto oxidation method
Auto oxidation method
Catalytic union of H2 and O2 to get H2O2 is found in Auto oxidation method