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Improving the Understanding of Catalytic Processes using Field Emission Techniques: The Case of NO+H2 on Pd-Au.

Catalysis plays a vital role in modern industrial applications. In the frame of automotive pollution control, dispersed nanoparticles are commonly used to reduce the emission of toxic gas species. To improve the efficiency of such processes, fundamental studies of the catalytic process is required at the single nanoparticle level in order to understand how the structure and composition of the catalytic material influence the reaction, and reversely, how the catalytic reaction influences the structure and composition of the catalyst. Indeed, local morphological and compositional changes occurring during the reaction might dramatically affect the reactivity and/or selectivity of the catalyst. To study these effects, we make use of the high-resolution capabilities of field emission techniques. Samples are prepared in the form of sharp tips and are used as model catalysts since the size (≈ 20 nm) and shape of the extremity of the sample mimics the structure of a single nanoparticle. In this work, Pd-38at%Au [1] alloys are used to study the synergistic effects in the alloy as compared to isolated metals during the hydrogenation of NO.