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Design of Catalysts with Artificially Controllable Functions Using Surface Acoustic Waves and Resonance Oscillations Generated on Ferroelectric Materials

Published online by Cambridge University Press:  10 February 2011

N. Saito ,
Y. Ohkawara ,
K. Sato  and
Y. Inoue
N. Saito
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Nagaoka 940–2188, Japan
Y. Ohkawara
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Nagaoka 940–2188, Japan
K. Sato
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Nagaoka 940–2188, Japan
Y. Inoue
Affiliation:
Department of Chemistry, Nagaoka University of Technology, Nagaoka 940–2188, Japan
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Abstract

A poled ferroelectric material of a LiNbO3 single crystal and a polycrystalline lead strontium zirconium titanate(PSZT) disc were employed as a catalyst substrate, on which various metals such as Pd, Ag, Ni and Pt and a WO3 oxide were deposited as a thin film catalyst. The effects of acoustic waves generated by rf power upon catalyst activation and reaction selectivity have been examined. The activity for CO oxidation of a Pt/PSZT catalyst increased by a factor of 3.9 with a thickness-extensional(TE) mode of resonance oscillation(RO) and 2.9 with a radial-extensional (RE) mode. The activation energy of the reaction was larger for the TE mode( 38 kJmol−1) than that for the RE mode(24 kJmol−1). The polarization axis-dependent changes in surface potential occurred with the TE mode, but not with the RE mode. With the TE mode, the activation energy of ethanol oxidation over a Ni/LiNbO3 and a Ag/LiNbO3 catalyst decreased from 36 to 19 kJmol−1 and from 76 to 30 kJmol−1, respectively, and the TE mode had a larger effect on the reaction with a higher activation energy. In ethanol dehydrogenation and dehydration on a WO3 / LiNbO3 catalyst, the TE mode increased remarkably the selectivity for ethylene production without giving a significant change to acetaldehyde production. The effects of acoustic wave excitations on the catalysts are discussed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 497: Symposium Z – Recent Advances in Catalytic Materials , 1997 , 215
Copyright
Copyright © Materials Research Society 1998

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References

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