Preparation and characterization of nanosized ZSM-5 zeolites in the absence of organic template

Nanosized ZSM-5 zeolite was successively synthesized in the absence of organic template by hydrothermal method. About 15 nm ZSM-5 zeolite was synthesized at 180 °C for 24 h after stirring at high speed and aging in the synthesis mixture with the molar composition of 12Na2O : 100SiO 2 : 2Al2O3 : 2500 H2O. X-ray diffraction (XRD) confirmed ZSM-5 crystal phase. Transmission electron microscopy (TEM) showed that ZSM-5 zeolite crystal sizes are about 15 nm. The electron diffraction spectroscopy (EDS) shows nanosized ZSM-5 zeolites chemical element compound. Fourier transform infrared (FTIR) analysis further showed that they are pentacyclic with typical absorption summit of ZSM-5 at about 550 cm- 1. Differential thermal analysis and thermogravimetry analysis (DTA/TG) showed that, at room temperature to 1073 K, nanosized ZSM-5 mass loss is 5.836%. © 2005 Elsevier B.V. All rights reserved.link_to_subscribed_fulltex