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Preparation and Characterization of Hydroxy-Feal Pillared Clays

Published online by Cambridge University Press:  28 February 2024

Dongyuan Zhao ,
Guojia Wang ,
Yashu Yang ,
Xiexian Guo ,
Qibin Wang  and
Jiyao Ren
Dongyuan Zhao*
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023 P.R. China
Guojia Wang
Affiliation:
Department of Chemistry, Jilin University, Changchun 130023 P.R. China
Yashu Yang
Affiliation:
Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P.R. China
Xiexian Guo
Affiliation:
Dalian Institute of Chemical Physics, Chinese Academy of Science, Dalian 116023, P.R. China
Qibin Wang
Affiliation:
Department of Fine Chemical Technology, Shenyang Institute of Chemical Technology, Shenyang 110021, P. R. China
Jiyao Ren
Affiliation:
Department of Fine Chemical Technology, Shenyang Institute of Chemical Technology, Shenyang 110021, P. R. China
*
1To whom correspondence should be addressed. Present address: Department of Fine Chemical Technology, Shenyang Institute of Chemical Technology, Shenyang 110021, P. R. China.
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Abstract

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Solutions containing hydroxy-FeAl oligocations (HFA) were prepared by two procedures: (1) treatment of a mixture of FeCl3 and AlCl3 with aqueous Na2CO3, followed by aging of the product and (2) preliminary preparation and aging of hydroxy-Al13 oligocations followed by reaction of the latter with aqueous FeCl3. Ion-exchange of Na-montmorillonite with HFA yield pillared clay (designated as FeAl-PILC) with d(001) values of 1.98–1.56 nm and a surface area of 230 m2/g. The pillar structure, thermal stability, surface acidity, and reduction behavior of the pillared clays were determined by 27Al-NMR, XRD, DTA, Mössbauer spectroscopy, Py-IR, TPD, TPR. Fe/Al ratios greatly affect the pillar structure, surface area and thermal stability of FeAl-PILC. The pillar in FeAl-PILC with Fe/Al ratio <0.5 has a Keggin structure, similar to that of Al-PILC, but the pillar structures of FeAl-PILC with Fe/Al ≥0.5 are the ferric tripolymer species similar to those of Fe-PILC. The basal spacings, surface area, and thermal stability are decreased with increasing Fe/Al ratio. There is relatively strong interaction between Fe and Al in the pillars. The interaction is enhanced with decreasing Fe/Al ratio. Reduction of the Fe phase in FeAl-PILC was reduced by the interaction of Fe with Al.

Keywords

AcidityHydroxy-FeAl pillarsPillared clayPreparationStability
Type
Research Article
Information
Clays and Clay Minerals , Volume 41 , Issue 3 , June 1993 , pp. 317 - 327
Copyright
Copyright © 1993, The Clay Minerals Society

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