Adsorption of carbon dioxide on zeolites NaX and NaY studied by a Temporal Analysis of Products (TAP) system

摘要

Using a temporal analysis of products (TAP) apparatus,we have carried out pulse response experiments of carbon dioxide on zeolites NaX and NaY.The response curves of CO_2 for both zeolites differed significantly in dependence on the temperature.In order to understand the different sorption/diffusion behavior of the studied zeolites,simulations were carried out considering different ratios of the diffusivity through the bed of porous grains to the effective diffusivity inside the zeolite grains as well as the influence of adsorption effects.In contrast to NaY,the results on NaX hint to a strong irreversible adsorption effect of carbon dioxide.Furthermore,the significant tailing of the response curves on NaX can be interpreted in the sense of a slow diffusion process insight the zeolite grains.