Abstract
We report an investigation of Rh-containing nanostructures dispersed on γ-alumina. This system is representative of many common heterogeneous catalysts that consist of transition metals dispersed on a high surface area support. Previous atomic-resolution Z-contrast STEM observations have shown the Rh particles to exist as thin “rafts” on the (100) surface of γ-alumina. This finding is intriguing given that the preferred surface exposure of γ-alumina is (110). Here we present first-principles density functional studies and simulated Z-STEM imaging suggesting that these Rh-containing structures consist of the high-pressure rhodium sesquioxide (II) phase growing on the surface.
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