Kinetics of CO₂ Adsorption on Zeolite 13X at High Temperature and Pressure

Abstract

Adsorption kinetics of CO₂ gas on Zeolite 13X at high temperature and pressure (~600 K, ~1 MPa) has been investigated experimentally and numerically for application to a CO₂ storage system in a CaO/CaCO₃ type high-temperature chemical heat pump (CHP).
The analytical model adopted reasonably simulates the empirical adsorption profiles on the assumption that mass transfer is controlled by pore diffusion and heat involved by adsorption is transferred within the particle by conduction.
The adsorption of CO₂ on Zeolite 13X proceeds very fast under the present conditions, and the rate of adsorption was verified to be sufficient to store the CO₂ gas produced by decomposition of CaCO₃ in the proposed CHP. However, since the adsorption in the early stage is greatly hindered by the heat of adsorption, removing the heat involved by adsorption is very important for the practical use.