In this research, dechlorination of reformate by the catalytic reforming process was investigated over ion-exchanged Y zeolites. Effects of cations, calcination, and reaction temperature on the removal of chloride compounds have been evaluated by performing dynamic tests. The adsorbents were characterized by X-ray diffraction, X-ray fluorescence analysis, thermogravimetric analysis, NH3 temperature-programmed desorption, pyridine Fourier transform infrared (pyridine-FTIR) spectroscopy, and X-ray spectroscopy (XPS). Pyridine-FTIR showed that the type and amount of acidic sites present in zeolites have a significant influence on the dechlorination performance of the zeolites: Bronsted acid contributes to increasing the dechlorination capacity, while excessive Lewis acid has an adverse effect on the dechlorination performance. XPS confirmed that the chemical state of the cation in zeolites affects the dechlorination performance of modified zeolites and cerium in the form of Ce3+ is more favorble for dechlorination.