Y-type zeolite can be considered among the most applied zeolites at industrial scale especially for catalytic transformations among various zeolites. Various synthesis techniques are employed to produce zeolite Y among which hydrothermal technique is considered as the most prevalent. In this study, synthesis of Y-type nano-zeolite was investigated through template-free hydrothermal technique. At various temperatures and aging times, zeolite Y was synthesized in the 10-30 nm size range with a first stage temperature of 25 °C and 87 °C as the second stage temperature. The as-synthesized zeolite was characterized using X-ray diffraction (XRD), Fourier-Transform Infrared (FTIR) spectroscopy, Field-Emission scanning electron microscopy (FE-SEM), Nitrogen adsorption–desorption, Transmission electron microscopy (TEM), and NH3-TPD and utilized as the nano-catalyst in methanol to dimethyl ether (DME) conversion process. Based on the results, at 400 °C, 53.7 % conversion to DME was obtained with 100% purity using hydrogen form of zeolite Y (H-Y) nano-catalyst. Natural zeolite is also considered as a proper additive to economize the product. پرونده مقاله