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Isomorphous replacement in the zeolitic frameworks: Recent advances and implications
Author(s): Sulikowski B
Source: HETEROGENEOUS CHEMISTRY REVIEWS    Volume: 3    Issue: 3    Pages: 203-268    Published: SEP 1996  
Times Cited: 42     References: 487   
Abstract: Isomorphous substitution in zeolites by silicon, aluminium, boron, gallium, germanium, titanium, vanadium and iron is described. Since the catalytic properties of the solid are inextricably linked to its structure and composition, much effort has been devoted in recent years to preparing zeolitic materials containing heteroatoms in their framework. The consequences of substitution of heteroatoms into 'regular' crystalline aluminosilicates are described, including methods of preparation and properties of these novel materials. The theoretical basis of replacement is first dealt with. The experimental progress made in characterization of molecular sieves is exemplified by extensive use of MMR, EXAFS, neutron scattering and laser Raman spectroscopy data, in addition to other techniques. In particular, the short-range order of Si and X (where X = Al or other heteroatom) located in the zeolitic framework has been explored by solid-state NMR. This turned out to be a key method in understanding the properties of dealuminated and recently obtained reilluminated zeolites.

Fractals, at first a purely mathematical concept, have found multiple applications in chemistry and materials science. Here we present how the fractal dimension of dealuminated and realuminated faujasites can be measured. The results are interpreted satisfactorily within the frame of XRD, FT IR and MAS NMR studies of those solids.

Finally, the catalytic behaviour of metallosilicates, in both gas phase and Liquid phase, is discussed. It is shown that in addition to acidic catalysts, redox-type zeolite catalysts can be successfully prepared (e.g. gallium-, titanium- and vanadosilicates). Such solids can be used in a number of oxidation and reduction reactions.

Taking into account the progress made in understanding isomorphous substitution in zeolites, there is no doubt that many novel and surprising materials will be synthesized in the future.
Document Type: Review
Language: English
KeyWords Plus: NUCLEAR-MAGNETIC-RESONANCE; DEALUMINATED Y-ZEOLITES; SILICON TETRACHLORIDE VAPOR; FAUJASITE-TYPE ZEOLITES; MICROPOROUS VANADIUM SILICATES; RESOLUTION SI-29 NMR; ANGLE-SPINNING NMR; TEMPERATURE-PROGRAMMED DESORPTION; RAY-ABSORPTION-SPECTROSCOPY; QUANTUM-MECHANICAL CALCULATIONS
Reprint Address: Sulikowski, B (reprint author), POLISH ACAD SCI, INST CATALYSIS & SURFACE CHEM, NIEZAPOMINAJEK 1, PL-30239 KRAKOW, POLAND
Publisher: JOHN WILEY & SONS LTD, BAFFINS LANE CHICHESTER, W SUSSEX, ENGLAND PO19 1UD
Subject Category: Chemistry, Physical; Physics, Atomic, Molecular & Chemical
IDS Number: VG250
ISSN: 1068-6983
4Â¥2010-01-17 18:05:44
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