The functionality of redox-active oxide materials is dependent on the presence of dopants, local atomic configuration, and electron density distribution. Applications in catalysis require a detailed understanding of these properties, including their influence on transition metal valence and the interaction with reactants, products, and spectator molecules. Ambient pressure X-ray photoelectron spectroscopy (AP-XPS) and X-ray absorption spectroscopy (XAS) can identify and quantify surface adsorbates and corresponding changes in transition metal valence, elucidating relationships between the local atomic environment and chemical reactivity. This presentation will employ AP-XPS and XAS in studies of iron-containing oxides of varying crystallinity and crystal structure, illustrating how changes in composition and structure influence the reactivity with molecules such as water.

Linking oxide surface composition and structure to reactivity

2019 Fall National Meeting

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