Title
Study of fe2o3-pillared clays synthesized using the trinuclear fe(iii)-acetato complex as pillaring precursor Study of fe2o3-pillared clays synthesized using the trinuclear fe(iii)-acetato complex as pillaring precursor
Author
Faculty/Department
Faculty of Sciences. Chemistry
Publication type
article
Publication
Amsterdam ,
Subject
Physics
Chemistry
Source (journal)
Microporous materials. - Amsterdam
Volume/pages
4(1995) :1 , p. 43-51
ISSN
0927-6513
ISI
A1995QX00800004
Carrier
E
Target language
English (eng)
Full text (Publishers DOI)
Abstract
Pillaring montomorillonite with the trinuclear Fe(III)-acetato complex results in an Fe2O3-pillared clay. The chemical nature of these intercalates, however, is still a point of discussion. With the aid of Fourier transform infrared (FTIR) techniques (mid-IR: diffuse reflectance, circular internal reflection, far-IR: transmission) it was possible to elucidate the nature of the pillaring precursor before, during and after the pillaring process. Changes in the acetato configuration during this process could easily be monitored in the mid-IR, while changes in the triangular M(3)O unit were followed in the far-IR. More information on the pillar composition was obtained by thermogravimetric analysis (TGA) (percentage acetyl) and electron probe micro analysis (EPMA) (percentage Fe). A further characterization of the resulting pillared clays was carried out using nitrogen adsorption to determine the specific surface area and the porosity. More detailed information on the pore size was obtained using the logarithmic adsorption isotherm and the derivative of this curve. It became clear that the original Fe complex changed seriously during hydrolysis; large Fe-oxyhydroxide polymers were formed. Intercalation of these species resulted in a mainly mesoporous structure.
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