title: Switching off hydrogen peroxide hydrogenation in the direct synthesis process.
abstract: Hydrogen peroxide (H2O2) is an important disinfectant and bleach and is currently manufactured from an indirect process involving sequential hydrogenation/oxidation of anthaquinones. However, a direct process in which H2 and O2 are reacted would be preferable. Unfortunately, catalysts for the direct synthesis of H2O2 are also effective for its subsequent decomposition, and this has limited their development. We show that acid pretreatment of a carbon support for gold-palladium alloy catalysts switches off the decomposition of H2O2. This treatment decreases the size of the alloy nanoparticles, and these smaller nanoparticles presumably decorate and inhibit the sites for the decomposition reaction. Hence, when used in the direct synthesis of H2O2, the acid-pretreated catalysts give high yields of H2O2 with hydrogen selectivities greater than 95%.
authors.affiliation: School of Chemistry, Cardiff University, Main Building, Park Place, Cardiff CF10 3AT, UK.
authors.forename: Jennifer K
authors.initials: JK
authors.lastname: Edwards
authors.forename: Benjamin
authors.initials: B
authors.lastname: Solsona
authors.forename: Edwin Ntainjua
authors.initials: EN
authors.lastname: N
authors.forename: Albert F
authors.initials: AF
authors.lastname: Carley
authors.forename: Andrew A
authors.initials: AA
authors.lastname: Herzing
authors.forename: Christopher J
authors.initials: CJ
authors.lastname: Kiely
authors.forename: Graham J
authors.initials: GJ
authors.lastname: Hutchings