Direct synthesis of hydrogen peroxide using Au-Pd-exchanged and supported heteropolyacid catalysts at ambient temperature using water as solvent

作者：Ntainjua Edwin N^*; Piccinini Marco; Freakley Simon J; Pritchard James C; Edwards Jennifer K; Carley Albert F; Hutchings Graham J

来源：Green Chemistry, 2012, 14(1): 170-181.

DOI：10.1039/c1gc15863e

The direct synthesis of hydrogen peroxide from molecular H-2 and O-2 represents a green and economic alternative to the current anthraquinone process used for the industrial production of H2O2. In order for the direct process to compete with the anthraquinone process, there is a need for enhanced H2O2 yields and H-2 selectivity in the process. We show that Au-Pd-exchanged and supported Cs-containing heteropolyacid catalysts with the Keggin structure are considerably more effective in achieving high H2O2 yields in the absence of acid or halide additives than previously reported catalysts. The Au-Pd-exchanged Cs-heteropolyacid catalysts also show superior H2O2 synthesis activity under challenging conditions (ambient temperature, water-only solvent and CO2-free reaction gas). Au plays a crucial role in achieving the improved performance of these heteropolyacid-based catalysts. The heteropolyacid limits the subsequential hydrogenation/decomposition of H2O2.

• 出版日期2012