Abstract: NaY zeolite was dealuminated by oxalic acid and ion-exchanged with NH4Cl to form NH4Y. Then HY was obtained by calcining NH4Y, and Ce(IV)Y was prepared by ion-exchanging NH4Y with cerium nitrate solution and calcination. Selective adsorptive desulfurization of FCC naphtha over various zeolite Y samples was conducted and the sulfur contents of naphtha samples were analyzed by microcoulometry. Static adsorption results showed that the sulfur removal rates of zeolite Y samples from high to low were in the order of Ce(IV)Y＞HY＞NaY; sulfur removal rates of Ce(IV)Y and HY were 79.0% and 77.8%, respectively. Kinetic adsorption results showed that dimethylthiophene (DMT) type sulfur containing compounds could be removed by Ce(IV)Y, but could not be removed by HY. The adsorption capacity of the regenerated Ce(IV)Y zeolite reached 95.5% of the fresh one.

Key words: dealumination, adsorptive desulfurization, catalytic cracking, DMTs