Every colloid has a gold lining: The direct synthesis of hydrogen peroxide from hydrogen and oxygen is attracting much interest as an alternative method for producing H2O2. Pd‐Au bimetallic nanocolloid exhibits high catalytic activity for the direct synthesis of H2O2 from H2 and O2. The high activity results from the presence of Au on the colloid surface which suppresses the decomposition of H2O2 in the presence of H2.

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Rutile TiO2 support is effective for increasing the formation rate as well as selectivity to H2O2. A great enhancement in the H2O2 formation rate and selectivity is achieved by controlling the particle size of Pd–Au (7:3 in weight ratio) alloy, and the average size of 18 nm exhibits the high selectivity to H2O2 under atmospheric pressure.

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