Thesis (M.Sc.)--Chulalongkorn University, 2010

Trace amount of hydrogen chloride (HCl) contaminated in hydrogen (H₂) feed stock which affects to downstream chemical processes. Thus, the removal of HCl gas over Meso-NaY was a focus. Meso-NaY by two synthesis methods (leaching and template) were studied. Material was characterized by X-ray Diffraction (XRD), N₂ adsorption-desorption, Scanning Electron Microscopy (SEM), X-ray Fluorescence (XRF) and Fourier Transform Infrared (FTIR). The phase and crystallite size of Meso-NaY showed the same structure as zeolite NaY. However, the surface area and the pore volume of Meso-NaY were increased, resulting higher HCl adsorption capacity compared to a commercial adsorbent. The effect of Mg positive charge adding into Meso-NaY lowered surface area by 50% and provided lower HCl removal than itself. Three methods of pelletization of Meso-NaY (Leaching) including pressing, mechanical coating, and extrusion, were studied. The pellet obtained by pressing metod provided higher surface area and adsorption performance of HCl with adsorption potential (Wb) of 0.1985 gHCl/gadsorbent. Moreover, spent adsorbent maintained sodium chloride in its structure.