Abstract
We investigated the interface structure between the Pt nanoparticles and the alumina support in a Pt/Al 2O 3 model catalyst reduced in flowing hydrogen gas at different temperatures by cross-sectional atomic-resolution transmission electron microscopy nanodiffraction techniques. An interfacial Pt 8Al 21 alloy with a tetragonal structure was formed at the Pt–alumina interface during the high-temperature reduction at 1073 K. This alloy phase was not formed when the Pt/Al 2O 3 model catalyst was reduced at 773 K. The platinum-assisted reduction of the alumina support and the subsequent strong metal–support interaction at the interface may be responsible for the formation of the interfacial alloy phase.
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