Effect of halide and acid additives on the direct synthesis of hydrogen peroxide using supported gold-palladium catalysts.
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.
Ntainjua N
Edwin
E
Cardiff Catalysis Institute, Cardiff University, UK.
Piccinini
Marco
M
Pritchard
James C
JC
Edwards
Jennifer K
JK
Carley
Albert F
AF
Moulijn
Jacob A
JA
Hutchings
Graham J
GJ
D000143:Acids / Q000737:chemistry*; D001965:Bromides / Q000737:chemistry*; D002384:Catalysis; D006046:Gold; D055772:Green Chemistry Technology / Q000379:methods*; D006861:Hydrogen Peroxide / Q000138:chemical synthesis*; D010165:Palladium
D000143:Acids; D001965:Bromides; D010165:Palladium; D006046:Gold; D006861:Hydrogen Peroxide