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Synthesis of Fine-grained NaA-type Zeolites from Superalkaline Solutions

โœ 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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โœฆ 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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Synthesis of molecular sieves from Chile
โœ Vilma Sanhueza; Ursula Kelm; Ruby Cid ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› Wiley (John Wiley & Sons) ๐ŸŒ English โš– 345 KB ๐Ÿ‘ 1 views

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