In:
Clays and Clay Minerals, Cambridge University Press (CUP), Vol. 41, No. 3 ( 1993-06), p. 317-327
Abstract:
Solutions containing hydroxy-FeAl oligocations (HFA) were prepared by two procedures: (1) treatment of a mixture of FeCl 3 and AlCl 3 with aqueous Na 2 CO 3 , followed by aging of the product and (2) preliminary preparation and aging of hydroxy-Al 13 oligocations followed by reaction of the latter with aqueous FeCl 3 . 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 m 2 /g. The pillar structure, thermal stability, surface acidity, and reduction behavior of the pillared clays were determined by 27 Al-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.
Type of Medium:
Online Resource
ISSN:
0009-8604
,
1552-8367
DOI:
10.1346/CCMN.1993.0410306
Language:
English
Publisher:
Cambridge University Press (CUP)
Publication Date:
1993
detail.hit.zdb_id:
2045991-9
detail.hit.zdb_id:
221428-3
SSG:
13
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