A promoted NaY zeolite ion exchanged by Cu, Zn, Co, and Ni characterized by XRD, FESEM, BET surface area, TGA, and XRF techniques, and evaluated in desulfurization of diesel fuels as an adsorbent. Commercial diesel fuel containing 2020 ppm sulfur-containing materials is used as feed, which is reduced to 89, 75, 78, and 75 ppm by Co, Ni, Cu, and Zn ion-exchanged zeolite Y, respectively. Also, the recycle life results exhibited a high thermal and chemical stability of prepared adsorbents at 4500C. It showed that the desulfurization capacity of prepared zeolites is stable after seven cycles of the adsorption process. The optimum calcination temperature showed that the most of adhered organic molecules were eliminated from the adsorbents between 450 and 5000C. The contact time result showed that more than 92% of the desulfurization process has done in the initial 10 min. The diesel efficiency yield results showed that the most of diesel have released after the desulfurization process, and Cu, Co, Zn, and Ni ion-exchanged zeolites passed about 94, 90, 87, and 91% refined diesel after desulfurization, respectively. Therefore, an ion-exchanged zeolite Y has been considered a useful adsorbent for industrial applications.

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