Papers by Keyword: MFI Zeolite

Abstract: High silica MFI zeolite membrane was synthesized by hydrothermal method at 313 K on asymetri pore structure alpha alumina substrate, utilizing natural rice husk as the sources of silica. The top layer of substrate was about 0.1 µm. The calcination was conducted at 773 K to remove the organic template. This membrane has a good stability at high temperature and in organic solvent. The membrane structure was identified by X-ray diffraction (XRD). The permeation of some pure gases was carried out to detect pinhole or cracking by studying mass transfer mechanism in the membrane. The pervaporation performance of as-synthesized membrane showed good results. This process was able to produce fuel grade bioethanol (99.2%) with the separation factor about 14.

Abstract: Nano-stacked aluminum titanium silicalite-1(NS-AlTS-1) zeolite with MFI structure was prepared by direct synthesis using a microwave technique and also prepared the conventional aluminum titanium silicalite-1(AlTS-1) by conventional hydrothermal method for comparison. The morphological aspects of these materials were investigated with the help of SEM. The zeolite framework Al location was confirmed by 27Al MAS NMR. The existence of Ti species in the zeolite framework and its co-ordination environment was investigated by UV-Vis spectroscopy. The uni-model distribution of weak acidic sites was estimated by the well established NH3-TPD technique.