Measurement of Intraparticle Effective D_iffusion Coefficient of NO in Metal Ion-exchanged Zeolites by Analysis of Breakthrough Curves

Abstract

Breakthrough curves of NO adsorption on various metal ion-exchanged zeolites have been employed to evaluate the intraparticle effective diffusion coefficient (D_i). D_i was 0.7×10^-3 -29×10^-3cm2⋅s^-1 and was changed with zeolite structures, metal ions exchanged, and adsorption temperature. On MFI zeolite, D_i was dependent on the radius of metal ion, and a maximum D_i was observed around 0.09 nm of the radius. With CuZSM-5 and Agmordenite, the maximum D_i was observed around 250 K, while the D_i of Comordenite was not varied with the adsorption temperature.