A Simplified Model for Acoustic Measurement of Diffusion in Microporous Solids

Abstract

An analytical model for sound propagation between two layers of a microporous material is presented in order to investigate the application of acoustic techniques for measuring adsorption and diffusion in microporous materials. The attenuation coefficient for the system CO 2 -Silicalite crystals is analysed in the range of pressure [2 Torr-3 bar] at T = 304.55 K, and indicates the potential feasibility of a novel experimental technique.

A model for sound propagation between two adsorbing microporous plates

“…The model extends the Isothermal Adsorption Model (Nori and Brandani, 2005), relaxing the isothermality assumptions. The solution in terms of polytropic constant is given by…”

“…The Isothermal Adsorption model is based on two thermal assumptions: The heat of adsorption is negligible and the temperature of the solid approximated as thermally homogeneous medium (Nori and Brandani, 2005) is constant. The polytropic constant is given by…”

“…Electronic mail: massimiliano.nori@gmail.com allow studying adsorption in industrial small crystals (e.g., 1 lm) and will increase the range of applicability of the macroscopic techniques (Nori and Brandani, 2005). In order to clarify the possibility of such measurements a model for sound propagation through a gas between two plates of microporous adsorbent material is presented.…”