Abstract
A unique UHV-compatible excitation system combined with an advanced ultra-high amplitude and frequency resolution acoustic spectrometer has been designed and constructed to permit accurate studies of the fundamental mechanism by which acoustic excitation may influence heterogeneous catalytic reactions. Here, the first results are presented, which demonstrate a remarkable sixfold increase in the rate of carbon monoxide oxidation when a Pt{110} thin single crystal is excited with low-frequency, low-energy surface acoustic waves (Rayleigh waves). In addition, chemical oscillations in the CO 2 production rate are found to be initiated and influenced by acoustic excitation of the system. It is proposed that the acoustic excitation results in an enhancement of the carbon monoxide desorption, which in turn affects the activity of the platinum catalyst if the reaction is in the transition between a low- and high-rate branch.
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