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Influence of The Preparation Conditions on the Structure of Hydrotalcite Layered Double Hydroxides

Published online by Cambridge University Press:  16 February 2011

A.V. Lukashin ,
S.V. Kalinin ,
M.P Nikiforov ,
A.I Zhirov ,
L.I. Kheifets ,
V.I Privalov  and
A.A. Vertegel
A.V. Lukashin
Affiliation:
Inorganic Chemistry Division, Dept. Chemistry, Moscow State University, 119899, Moscow, Russia, alex@inorg.chem.msu.ru
S.V. Kalinin
Affiliation:
Inorganic Chemistry Division, Dept. Chemistry, Moscow State University, 119899, Moscow, Russia, alex@inorg.chem.msu.ru Now at the Dept. of Mat. Sci. Eng., University of Pennsylvania, Philadelphia, PA 19104, USA
M.P Nikiforov
Affiliation:
Inorganic Chemistry Division, Dept. Chemistry, Moscow State University, 119899, Moscow, Russia, alex@inorg.chem.msu.ru
A.I Zhirov
Affiliation:
Inorganic Chemistry Division, Dept. Chemistry, Moscow State University, 119899, Moscow, Russia, alex@inorg.chem.msu.ru
L.I. Kheifets
Affiliation:
Inorganic Chemistry Division, Dept. Chemistry, Moscow State University, 119899, Moscow, Russia, alex@inorg.chem.msu.ru
V.I Privalov
Affiliation:
Kurnakov Institute of General and Inorganic Chemistry, Moscow, Russia
A.A. Vertegel
Affiliation:
Inorganic Chemistry Division, Dept. Chemistry, Moscow State University, 119899, Moscow, Russia, alex@inorg.chem.msu.ru
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Abstract

Influence of the precipitation conditions on the structure of Mg – Al layered double hydroxides (LDH) was investigated. XRD measurements demonstrate that species with hydrotalcite structure forms at high pH of reaction mixture (pH = 9 - 11), while at lower pH values (pH = 7 - 8) species with meixnerite structure arise. At the same time 27Al NMR studies of samples obtained at pH > 10 reveal the presence of tetrahedrally coordinated aluminum. XRD, NMR and IR data suggest that partial substitution of CO32- for Al(OH)4- in the interlayer space with subsequent formation of oxoaluminate bridges takes place at high pH. The optimal conditions for the preparation of intercalation-active materials were proposed.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 547: Symposium DD – Solid-State Chemistry of Inorganic Materials II , 1998 , 239
Copyright
Copyright © Materials Research Society 1999

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