Document Type: Research Article
Tarbiat Modares University, Tehran. I.R. Iran
In this research, zeolite Na-Y was synthesized from Kaolin without organic template under non-hydrothermal condition in order to adsorb sulfur compound. Model fuel desulfurization was optimized by employing Box-Behnken experimental design with 2 center points, the three parameters, and one response value. The objective was to find how sorption capacity is related to alkali fusion temperature, crystallization time, and aging time. Optimal DBT adsorbent was synthesized at 550℃, minimum crystallization time and maximum aging time. The zeolite samples were characterized by FTIR and XRD. Crystallinity of the samples was lower than the crystallinity of commercial zeolite Y. During zeolite preparation, there were competition between zeolite Na-Y, Na-P, Na-X and Na-A. The equilibrium results were well fitted by the Langmuir and Freundlich isotherms for the best adsorbent. The largest DBT adsorption capacity, 32.67 mg DBT/g, was calculated for the optimal adsorbent. Pseudo-first order and pseudo-second order models were evaluated to understand the kinetic of the adsorption process. The reduction of DBT obeyed the second-order model of kinetic. Ni-Y and La-Y zeolites were prepared by liquid-phase ion-exchange method. The maximum DBT adsorption capacity has been observed for Ni–Y (∼ 72.25 mg DBT/g) and La–Y (∼ 66.59 mg DBT/g).