A Novel and Efficient method for the Direct and Rapid Synthesis of Nanocrystalline Zeolites by Supercritical Water Medium |
Paper ID : 1317-UFGNSM-FULL |
Authors: |
Abstract: |
Nanocrystalline zeolites are emerging as important materials for a variety of potential applications in industry and medicine. Reducing the particle size to less than 100 nm results in advantages for nanocrystalline zeolites relative to micrometer-sized zeolite crystals, such as very large total and external specific surface areas and reduced diffusion path lengths. Understanding the physical and chemical properties of zeolite nanocrystals is imperative for further development and application of nanocrystalline zeolites. In this study Nanocrystalline zeolites with narrow size distributions less than 30 nm for the first time have been synthesized in a supercritical water medium using various reactants and batch composition. Zeolites of analcime (ANA), FAU and a mixture of FAU and LTA were synthesized and extensively characterized by powder X-ray diffraction (XRD) and transmission electron microscope (TEM). Results show a decrease in particle size, high purity and product yields .What is more, in comparison with low- temperature hydrothermal method, duration time has been decreased from many hours or days (depending on the reacting source) to a few minutes (~10 min) which is noteworthy in terms of energy consumption. |
Keywords: |
Supercritical water, Nano crystalline zeolites, analcime, FAU, LTA. |
Status : Paper Accepted (Oral Presentation) |