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

Edwin N Ntainjua, Marco Piccinini, Simon J Freakley, James C Pritchard, Jennifer K Edwards, Albert F Carley, Graham J Hutchings

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44 Citations (Scopus)

Abstract

The direct synthesis of hydrogen peroxide from molecular H2 and O2 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 H2 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.
Original languageEnglish
Pages (from-to)170-181
Number of pages12
JournalGreen Chemistry
Volume14
Issue number1
Early online date8 Nov 2011
DOIs
Publication statusPublished - 1 Jan 2012

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