The synthesis of NaA type zeolites has been studied at autogenous pressure using Chilean kaolins as starting materials. The ratios of have been set at 1.9 or SiO 2 /Al 2 O 3 , Na 2 O/SiO 2 , H 2 O/Na 2 O 2.5, 0.6 or 1.0 and 50 or 90, respectively. Reaction times have been 5 or 15 h and reaction temp
Synthesis of Fine-grained NaA-type Zeolites from Superalkaline Solutions
โ Scribed by Dr. rer. nat. Marianne Hadan; Dr. rer. nat. Falk Fischer
- Publisher
- John Wiley and Sons
- Year
- 1992
- Tongue
- English
- Weight
- 423 KB
- Volume
- 27
- Category
- Article
- ISSN
- 0232-1300
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โฆ Synopsis
The synthesis of NaA-type zeolite from superalkaline reaction mixtures by influence on the formation-and transformation rate of the polymorphous phases according to the Ostwald step rule is discussed. The appearence time of NaA as a single crystallization product is described in dependence on the reaction conditions. The kinetics of the zeolite crystallization and the property alterations of the reaction products in dependence on the time are investigated in the pilot scale.
Die Synthese .van NaA-Zeolith aus hochalkalischen Reaktionsgemischen durch gezielte Beeinflussung von Bildungs-und Transformationsgeschwindigkeit der polymorphen Phasen entsprechend der Ostwaldschen Stufenregel wird untersucht und die Existenzzeit einphasiger Kristallisationsprodukte von NaA-Zeolith in Abhangigkeit von den Reaktionsbedingungen dargestellt. Die Kinetik der NaA-Kristallisation und die Eigenschaftsiinderungen der Kristallisationsprodukte in Abhangigkeit von der Reaktionszeit werden im kleintechnischen MaRstab verfolgt.
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