The dispersion relation for interfacial sound modes in the presence of a single catalytic reaction at the planar interface between anNhyphen;component fluid and a rigid, thermally conducting solid, has been derived. The chemical contribution to the attenuation coefficient of these modes is shown to have nonanalytic dependence on frequency ohgr; and may be written agr;chemint=agr;0ohgr;2(1+(ohgr;tgr;s)1/2/2)/(1+ (2ohgr;tgr;s)1/2+ohgr;tgr;s)thinsp;, where the surface chemical relaxation time tgr;sis proportional to an average diffusion coefficient and inversely proportional to the square of the rate constant for the surface reaction, and agr;0depends on the volume and enthalpy changes in this reaction. The experimental study of interfacial sound modes may be an important probe of the kinetics of heterogeneous catalytic reactions.
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