Abstract
The effects of resonance oscillation (RO) with a thickness-extensional mode generated in a poled ferroelectric z-cut LiNbO 3 single crystal by rf power were studied on reaction selectivity for the ethanol decomposition of thin film Au, Ag and WO 3 catalysts deposited. For a 100 nm Ag catalyst, a 3.5 MHz RO at 3 W caused an increase in ethylene production at 573 K by a factor of 16 without any change in acetaldehyde production. The selective promotion of ethylene production by RO was also observed at 573 K for a Au catalyst in which the activity for ethylene production increased by a factor of 5. For a WO 3 catalyst the RO increased both the ethylene and acetaldehyde productions, but the former was more largely promoted than the latter. The RO caused decreases in respective activation energy. The selective production of ethylene is associated with the RO-induced strong oxygen–metal (and metal oxide) surface interactions which are produced by dynamic lattice displacement.
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