The effects of surface acoustic waves (SAWs) and resonance oscillations (ROs) on the activity and selectivity of heterogeneous catalysts were reviewed. In ethanol oxidation over a Pd thin film deposited on the SAW propagation path , the SAW effects were greater for thicker Pd films and for oxidized surfaces than for metallic ones . Lattice displacement measurements and SAW propagation loss showed that the SAW effects of the oxidized catalyst surface are attributed to the interactions between

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... ctrons in the oxide layers and SAW. In RO of a poled ferroelectric Sr-doped lead zirconium titanate, the effects of a thickness extensional mode on ethanol oxidation over a Ag catalyst were associated with changes in surface potential and work functions of the Ag surface with R0 . RO using a ferroelectric LiNb03 single crystal caused a remarkably higher activity enhancement for ethanol oxidation on Pd and a selectivity change leading to higher ethylene production in the dehydration and dehydrogenation of ethanol on W03. The SAWs and ROs are concluded to be useful for the design of a heterogeneous catalyst which has artificially controllable functions for chemical reactions.