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Catalytic Activity of Sodium Kaolinites

Published online by Cambridge University Press:  01 July 2024

D. G. Hawthorne  and
D. H. Solomon
D. G. Hawthorne
Affiliation:
C.S.I.R.O. Division of Applied Chemistry, P.O. Box 4331 G.P.O., Melbourne, Victoria, Australia
D. H. Solomon
Affiliation:
C.S.I.R.O. Division of Applied Chemistry, P.O. Box 4331 G.P.O., Melbourne, Victoria, Australia
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Abstract

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Kaolinites, catalytically active for the polymerization of styrene, can be deactivated by treatment with 1N aqueous sodium chloride. Subsequent washing of the sodium kaolinite results in a facile hydrolysis yielding an active hydronium/aluminum kaolinite in which the exchangeable cations act as surface Br0onsted acid initiation sites.

Résumé

Résumé

Des kaolinites, dotées d’une activité catalytique pour la polymérisation du styrène, peuvent être inactivées par un traitement au chlorure de sodium aqueux 1 N. Un lavage ultérieur de la kaolinite sodique entraîne une hydrolyse facile qui fournit une kaolinite hydronium/aluminium, dans laquelle les cations échangeables agissent comme sites d’initiation superficiels par une acidité de Brønsted.

Kurzreferat

Kurzreferat

Kaolinite, die für die Polymerisation von Styrol katalytisch aktiv sind, können durch Behandlung mit 1 N wässriger Natriumchloridlösung deaktiviert werden. Nachfolgendes Waschen des Natriumkaolinits führt ohne weiteres zu Hydrolyse, bei welcher ein aktiver Hydronium/Aluminium Kaolinit gebildet wird, in welchem die austauschbaren Kationen Stellen zur Einleitung einer Brønstedsäure-Oberfläche bilden können.

Резюме

Резюме

Каолиниты, являющиеся активными катализаторами при полимеризации стирола, лишаются своей активности при обработке 1N водным раствором хлорида натрия. Последующее промывание натриевого каолинита приводит к легкому гидролизу, дающему активный HзО+/Al-каолинит, в котором обменные катионы действуют как поверхностные кислотноинициирующие центры.

Type
Research Article
Information
Clays and Clay Minerals , Volume 20 , Issue 2 , April 1972 , pp. 75 - 78
Copyright
Copyright © 1972, The Clay Minerals Society

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