Hydrogen Peroxide Bleaching. GreenOx Bleaching Process.

The Surfactant-Promoted Electroreduction of Oxygen to Hydrogen Peroxide

“…7 Moreover, catalyzed acidic ͑pH 5͒ peroxide bleaching technologies have been developed and implemented on an industrial scale. 8,9 Unfortunately, the electroreduction of O 2 for large-scale H 2 O 2 production at pH Ͻ ϳ13 presently does not meet industrial feasibility requirements such as current efficiency above 80% at current densities of 1-5 kA m Ϫ2 , a specific energy less than about 4 kWh kg H 2 O 2 Ϫ1 , and a return of investment greater than approximately 30% per year at a H 2 O 2 price of about 0.6 $͑US͒ kg Ϫ1 . Hydrogen peroxide electrosynthesis at pH Ͻ 13 is challenging due mainly to kinetic aspects related to the sluggishness of O 2 electroreduction 2,10 and the enhanced rate of H 2 O 2 electroreduction to H 2 O.…”