Binary Ion Exchange of Metal Ions in Y and X Zeolites
نویسندگان
چکیده
The ion exchange of Na for Cr/K, Cr/Mg and Cr/Ca in Y and X zeolites was studied using breakthrough curves. It was observed that Cr ions were able to remove some competitive ions that had already been exchanged at the zeolitic sites, producing a sequential ion exchange. Some mass transfer parameters such as length of unused bed, overall mass transfer coefficient, operational ratio and dimensionless variance were studied. Chromium uptake was influenced much more by the competing ion in the NaX zeolite columns. The dimensionless variance indicated that Cr/K solution produced a greater axial dispersion than the Cr/Mg and Cr/Ca systems, probably due to some interaction between Cr and K ions. The order of dynamic selectivity, provided by the cation uptake, was Cr > Ca, Cr > Mg and Cr > K for NaY zeolite and Ca ≈ Cr, Mg > Cr and Cr > K for NaX zeolite. Due to the more favorable mass transfer parameters and higher affinity for Cr, it was concluded that NaY zeolite was more efficient at chromium uptake in competitive systems.
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