Observation of low energy modes of adsorbed CO on Pd and Pt catalysts
Carbon monoxide, CO, occurs widely in industry in many roles spanning feedstock to pollutant. Catalysis is intimately involved in many of these processes so it is unsurprising that the adsorption of CO on most of the transition metals has been studied extensively. In principle, the metal-to-carbon stretch and deformation modes of adsorbed CO should be very informative as they provide direct information on the adsorbate-catalyst interaction. In practice, this is not the case because for the optical techniques that are commonly used the modes occur in the region 500 - 800 cm-1 that for supported catalysts is difficult to access due to complete absorption of light by the support material. However, these are transparent to INS spectroscopy, in addition pressures up to 1 bar are routine, there are no selection rules and the resolution with current generation instruments is comparable to optical methods. To date all INS catalysis experiments have used hydrogenous adsorbates in order to take advantage of the large cross section of 1H. We propose to use IN1-Lagrange to observe the low energy modes of adsorbed CO on industrially relevant materials, for the very first time.
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PARKER Stewart F; ALBERS Peter and JIMENEZ RUIZ Monica. (2015). Observation of low energy modes of adsorbed CO on Pd and Pt catalysts. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.7-05-441
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