Synthesis and characterization of Mn-incorporated ZSM-5 type zeolite in the presence of K+ as an alkaline system

Zeolites are crystalline aluminosilicates with regular and uniform porous structures. In these materials, Si/Al atomic ratio can be varied from 1 to ∞; so highly hydrophobic aluminum-free synthetic zeolites can also be attainable [1]. Thanks to the development of the synthetic techniques, there are grated many synthetic zeolites with different compositional elements and frameworks [2]. Other elements, especially transition metals, can incorporate into the zeolite framework. Following our previous reports in synthesis of Al [3], Cr [4] or Fe [5] containing MFI type zeolites, we were prepared Mn-incorporated ZSM-5 type zeolite by means of MnCl2.4H2O in aqueous basic solution as manganese source, silicic acid as silica source and potassium carbonate as alkaline system with a facile “one-step” hydrothermal method. Because of cost saving effects, “one-step” methods have great significance in industrial approaches in contrast to “multi-step” methods. The samples were characterized by N2 adsorption analysis, XRD, SEM, and FTIR. Aforementioned techniques confirmed successfully synthesis of pure ZSM-5 type manganosilicates and evidences were achieved for incorporation of Mn ions into zeolite lattice.