Direct Synthesis of Hydrogen Peroxide Using Cs-Containing Heteropolyacid-Supported Palladium–Copper Catalysts
The direct synthesis of hydrogen peroxide (H2O2) from molecular hydrogen and oxygen could represent a green and economically attractive alternative to the current indirect anthraquinone process used for the industrial production of hydrogen peroxide. This reaction has been investigated using palladium supported on the Cs-containing heteropolyacid Cs2.5H0.5PW12O40. In addition, the effect of adding copper as a potential activity promoter was investigated. These catalysts were also evaluated for the subsequent degradation of hydrogen peroxide. The catalytic activity of the 0.5 wt%Pd/Cs2.5H0.5PW12O40 catalyst towards hydrogen peroxide synthesis was greater than that of both the mono-metallic Cu or bi-metallic Pd–Cu analogues with the incorporation of Cu to Pd resulting in a significant decrease in catalytic selectivity for the formation of hydrogen peroxide. Moreover, 0.5 wt%Pd/Cs2.5H0.5PW12O40 also showed low activity towards the degradation of hydrogen peroxide. Hence the use of the Cs-containing heteropolyacid as a support for Pd gives higher rates of hydrogen peroxide formation when compared with different supported Pd catalysts prepared using supports used in previous studies.
KeywordsGreen chemistry Copper Palladium Bimetallic catalysts Heteropolyacids Hydrogen peroxide
The authors would like to thank KACST for funding of this project. In addition, we thank our colleagues from Cardiff University who provided insight and expertise that greatly assisted in completing the work.
- 10.Riedl HJ, Pfleiderer G (1939) IG Farbenindustrie AGGoogle Scholar