ISSN:
1572-8943
Source:
Springer Online Journal Archives 1860-2000
Topics:
Chemistry and Pharmacology
Description / Table of Contents:
Zusammenfassung Die Kristallisation des siliziumreichen templathaltigen Zeoliths ZSM-5, modifiziert mit Gallium, wird mittels TG-DTA untersucht. Es wird ein Zusammenhang zwischen der Zersetzungstemperatur des Templats, dem Gehalt an Templat sowie der Koks-bildung aus den Templatzersetzungsprodukten und der isomorphen Substitution, dem Si/Ga-verhältnis sowie der Kristallinität der Zeolithproben gefunden.
Notes:
Abstract The crystallization of Ga-ZSM-5 zeolites and the incorporation of gallium into the framework were investigated by means of TG-DTA measurements. Special attention was paid to the decomposition of the embedded template, which was followed by the observation of coke formed in particular on the external surface of the crystals. A semiquantitative relation was found between the maximum temperature of template decomposition and the Si/Ga ratio in the framework. The amount of embedded template depended on both the zeolite content of the sample and the Si/Ga ratio in the framework. The apparent velocity of desorption of products resulting from the decomposed template, and the coke/template ratio, were sensitive to the crystallinity of the Ga-ZSM-5 samples.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF01912808
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