Zeolite ZSM-5 membranes grown on porous α-Al2O3

Zeolite ZSM-5 Membranes Grown on Porous a-A1203

Zeolites have found widespread applications as catalysts and separation media. A L present, all technologies exploiting these materials use the zeolite in powder composite form. The desire to translate the molecular sieving properties of zeolite powder composites into a membrane configuration has long been recognized. To prepare such a membrane, the crystals must grow in an interlockng fashion ...

Binder Effects in SiO2‐ and Al2O3‐Bound Zeolite ZSM‐5‐Based Extrudates as Studied by Microspectroscopy

Microspectroscopic methods were explored to investigate binder effects occurring in ZSM-5-containing SiO2- and Al2O3-bound millimetre-sized extrudates. Using thiophene as a selective probe for Brønsted acidity, coupled with time-resolved in situ UV/Vis and confocal fluorescence microspectroscopy, variations in reactivity and selectivity between the two distinct binder types were established. It...

Organosilane with gemini-type structure as the mesoporogen for synthesis of hierarchical porous ZSM-5 zeolite

A new kind of organosilane (1,6-bis (diethyl(3-trimethoxysilylpropyl)ammonium) hexane bromide) with a geminitype structure was prepared and used as a mesoporogen for the synthesis of hierarchical porous ZSM-5 zeolite. There are two quaternary ammonium centers along with double hydrolysable -RSi(OMe)3 fragments in the organosilane, which results in a strong interaction between this mesoporogen a...

Preparation of Zsm-5 Zeolite Membranes by Combined Hydrothermal Synthesis and Electrophoretic Deposition

High-pressure cation-exchange treatment of a ZSM-5 zeolite

ZSM-5 zeolite is an aluminosilicate that usually has a high silica-to-alumina ratio. It contains two sets of nanopores. One set of nanopores is straight, with the cross-sectional size of 5.3 5.6 Å; the other set is Sshaped, with the cross-sectional size of 5.2 5.5 Å. An A1 atom at the center of an AlO4 tetrahedron connects to adjacent SiO4 tetrahedron by sharing an O atom and thus generates a n...