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Synthesis of Na-A Zeolite from 10 Å Halloysite and a new Crystallization Kinetic Model for the Transformation of Na-A into HS Zeolite

Published online by Cambridge University Press:  01 January 2024

Daniela Novembre ,
Bruno Di Sabatino  and
Domingo Gimeno
Daniela Novembre
Affiliation:
Dipartimento di Scienze della Terra, Université degli Studi ‘G.D’Annunzio’, Via dei Vestini 30, 66013 Chieti, Italy
Bruno Di Sabatino
Affiliation:
Dipartimento di Scienze della Terra, Université degli Studi ‘G.D’Annunzio’, Via dei Vestini 30, 66013 Chieti, Italy
Domingo Gimeno*
Affiliation:
Departamento de Geoquímica, Petrologia y Prospecció Geològica, Universitat de Barcelona, 08028 Barcelona, Spain
*
*E-mail address of corresponding author: [email protected]
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Abstract

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The present work deals with the synthesis of Na-A zeolite using 10 Å halloysite (collected near Grosseto, Italy) as the starting material, instead of the more expensive chemicals currently used in industry (Na aluminates and Na silicates). The process of synthesizing Na-A zeolite from 10 Å halloysite is rather simple as the reaction of halloysite with alkali occurs very readily and is achieved without prior thermal activation at high temperature. The optimal conditions of crystallization of Na-A zeolite from 10 Å halloysite are reached at 80°C. At lower temperatures, transformation of halloysite into an amorphous material requires more time, and the field within which Na-A zeolite exists overlaps that of 7 Å halloysite, G and HS zeolites. The products of synthesis at 80°C were characterized by X-ray diffraction, scanning electron microscopy, inductively coupled plasma optical emission spectrometry and infrared spectroscopy. We also propose a model to study the reaction kinetics of zeolite (Na-A and HS) nucleation and growth by real-time X-ray powder diffraction data.

Keywords

10 Å Halloysite to 7 Å Halloysite TransformationNa-A Zeolite SynthesisNatural Halloysite
Type
Research Article
Information
Clays and Clay Minerals , Volume 53 , Issue 1 , February 2005 , pp. 28 - 36
Copyright
Copyright © Clay Minerals Society 2005

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