Preparation and characterization of ZSM-5 zeolite membranes

Abstract This research explains the hydrothermal synthesis of ZSM-5 zeolite membranes on porous α-Al2O3 support by secondary growth technique for gas separation applications. The obtained zeolite membranes are characterized using SEM, EDX, TEM and XRD techniques. To prepare the ZSM-5 membranes, the nanosized Silicalite-1 powder with mean size of 40nm is first synthesized as seed from a clear solution. The effect of aluminum contents on the formation of ZSM-5 crystalline layer was examined by SEM observation of the status of crystal intergrowth on the surface. The single gas permeation experiments were performed over the pressure difference range of 1-4bar at room temperature. Under optimum synthesis conditions, the permselectivity of membrane at 300K for H2/CH4, H2/CO2 and H2/N2 were 3.8, 3.5 and 4.4. The obtained results in this study confirmed the formation of ZSM-5 zeolite membrane with good performance for hydrogen separation processes.

کلیدواژه ها:

ZSM-5 ، Zeolite membrane ، Nano Silicalite-1 ، Secondary growth ، Characterization ، permselectivity