1. Effect of Halide and Acid Additives on the Direct Synthesis of Hydrogen Peroxide using Supported Gold-Palladium Catalysts
- Author
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Jacob A. Moulijn, Jennifer K. Edwards, James Charles Pritchard, Graham J. Hutchings, N Edwin Ntainjua, Albert Frederick Carley, and Marco Piccinini
- Subjects
inorganic chemicals ,Chemistry ,Magnesium ,General Chemical Engineering ,Inorganic chemistry ,chemistry.chemical_element ,Halide ,Heterogeneous catalysis ,Decomposition ,Catalysis ,chemistry.chemical_compound ,General Energy ,Bromide ,Environmental Chemistry ,General Materials Science ,Hydrogen peroxide ,Palladium - Abstract
The effect of halide and acid addition on the direct synthesis of hydrogen peroxide is studied for magnesium oxide- and carbon-supported bimetallic gold-palladium catalysts. The addition of acids decreases the hydrogenation/decomposition of hydrogen peroxide, and the effect is particularly pronounced for the magnesium oxide-supported catalysts whilst for carbon-supported catalysts the pH requires close control to optimize hydrogen peroxide synthesis. The addition of bromide leads to a marked decrease in the hydrogenation/decomposition of hydrogen peroxide with either catalyst. These effects are discussed in terms of the structure of the gold-palladium alloy nanoparticles and the isoelectric point of the support. We conclude that with the highly active carbon-supported gold-palladium catalysts these additives are not required and that therefore this system presents the potential for the direct synthesis of hydrogen peroxide to be operated using green process technology.
- Published
- 2009