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Infra-red studies of ammoniation of pillared montmorillonites

Published online by Cambridge University Press:  09 July 2018

S. Witkowski ,
Z. Sojka ,
K. Dyrek ,
J. Fijał ,
S. Olkiewicz ,
P. Fink  and
H. Hobert
S. Witkowski
Affiliation:
Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Cracow
Z. Sojka
Affiliation:
Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Cracow
K. Dyrek*
Affiliation:
Faculty of Chemistry, Jagiellonian University, ul. Ingardena 3, 30-060 Cracow Regional Laboratory of Physicochemical Analyses and Structural Research, ul. Ingardena 3, 30-060 Cracow
J. Fijał
Affiliation:
Department of Mineralogy and Geochemistry, Academy of Mining and Metallurgy, al. Mickiewicza 30, 30-059 Cracow, Poland
S. Olkiewicz
Affiliation:
Department of Mineralogy and Geochemistry, Academy of Mining and Metallurgy, al. Mickiewicza 30, 30-059 Cracow, Poland
P. Fink
Affiliation:
Institute of Physical Chemistry, Friedrich Schiller University, Lessingstrasse 10, 07-743 Jena, Germany
H. Hobert
Affiliation:
Institute of Physical Chemistry, Friedrich Schiller University, Lessingstrasse 10, 07-743 Jena, Germany
*
*E-mail: [email protected]
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Abstract

Ammoniation of montmorillonites pillared with polyhydroxo-complexes of Al was performed in flow conditions at 773–1073 K and monitored by IR spectroscopy. Interaction of the clay with ammonia revealed exchange of terminal and bridging -OH groups by NH2-, NH- and N- species depending on the reaction temperature. Amination begins at 773 K while formation of NH groups starts at 873 K. Transformation of NH- into N-species occurs at 973 K. A mechanism for the ammoniation reaction is proposed and the series of the relative reactivity of OH groups was established: Si–OH > Mg–OH–Mg > Al–OH–Mg > Al–OH–Al. This series was rationalized in terms of accessibility of the OH groups.

Keywords

IRammoniationpillared montmorillonitepolyhydroxo complexes
Type
Research Article
Information
Clay Minerals , Volume 35 , Issue 2 , April 2000 , pp. 345 - 355
Copyright
Copyright © The Mineralogical Society of Great Britain and Ireland 2000

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