Synthesis and characterization of Sn- containing ZSM-48 type molecular sieves using different templates

Al-free, tin-containing medium pore ZSM-48 type molecular sieves (Si/Sn > 50) have been synthesized using two different organic templates, viz., 1,8 diamino octane and pyrrolidine. The Sn-ZSM-48 samples were characterized by XRD, SEM, FT-IR, UV-Vis and adsorption techniques. An increase in the unit cell volume, an absorption around 970 cm(-1) in the IR region and 210 nm in the UV region point to the formation of Sn-O-Si linkages. The possible location of Sn4+ ions which may be grafted to the ZSM-48 structure is indicated. The Sn-samples are active in the hydroxylation of phenol, toluene and cyclohexane with aqueous H2O2. The higher activity of the samples derived from 1,8 diamino octane is probably due to the smaller particle size and the absence of SnO2 type of species.