Abstract
Three samples HY, CuY and NiY-zeolites have been prepared by exchanging some of sodium ions with hydrogen, copper or nickel. The produced solids were characterized using x-ray diffraction, ir-absorption and high temperature adsorption of benzene.
XRD analysis revealed that the exchange of sodium ions by hydrogen or transition metal ions did not modify the crystal structure of zeolite but induced some decrease in the degree of crystallinity. IR-investigation showed that the absorption ir-bands may change their positions or change their intensities due to the exchange of sodium ions by the other ions. The high temperature adsorption of benzene on different zeolite samples showed a decrease in the adsorptive capacity due to the exchange of sodium by the other ions. This can be attributed to the change in the degree of crystallinity or/and the decrease in the number of ions in zeolites.