Frequency response of adsorption of a gas onto bidisperse pore-structured solid with modulation of inlet molar flow-rate

We present a theoretical analysis of the frequency response of a continuous -flow adsorber for adsorption of a gas onto bidisperse pore-structured soli d, forced by the periodic modulation of the inlet now-rate. Spherical macro particle and spherical microparticle geometries are considered. A local ads orption equilibrium of the gas on the exterior surface of microparticle is assumed. It is confirmed that the in-phase characteristic function of the f requency response of a flow adsorber is independent of the overflow paramet er, but that the out-of-phase characteristic function is a strong function of the overflow in the lower frequency region. The overall characteristic f unctions in the microparticle diffusion regime have information of both mic roparticle diffusion and macropore diffusion. Hence, in this regime we can extract the macropore diffusion parameter as well as the microparticle diff usion parameter from the experimental data of the overall characteristic fu nctions. In the microparticle diffusion regime the capacity parameter of mi croparticle affects also the characteristic functions.