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Fe(III)-modified montmorillonite and bentonite: Synthesis, chemical and UV-VIs spectral characterization, arsenic sorption, and catalysis of oxidative dehydrogenation of propane

Published online by Cambridge University Press:  01 January 2024

T. Grygar ,
D. Hradil ,
P. Bezdička ,
B. Doušová ,
L. Čapek  and
O. Schneeweiss
T. Grygar*
Affiliation:
Institute of Inorganic Chemistry ASCR, 250 68 Řež, Czech Republic
D. Hradil
Affiliation:
Institute of Inorganic Chemistry ASCR, 250 68 Řež, Czech Republic
P. Bezdička
Affiliation:
Institute of Inorganic Chemistry ASCR, 250 68 Řež, Czech Republic
B. Doušová
Affiliation:
Institute of Chemical Technology in Prague, Technicka 5, 166 28 Prague 6, Czech Republic
L. Čapek
Affiliation:
University Pardubice, Čs. Legii 565, 532 10 Pardubice, Czech Republic
O. Schneeweiss
Affiliation:
Institute of Physics of Materials ASCR, Žižkova 22, 616 62 Brno, Czech Republic
*
*E-mail address of corresponding author: [email protected]
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Abstract

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Two major species were identified in Fe-treated montmorillonite: monomeric or dimeric hydroxoaqua cations Fe(OH)x(3−x)+${\rm{Fe}}({\rm{OH}})_x^{(3 - x) + }$ (form I), and polymeric structures with edge-shared Fe(O,OH)6 (form II). These species have different electron spectra (absorption maximum is 29,600 cm−1 in form I, and 26,000 and 28,000 cm−1 in form II), chemical and thermal stability, and electrochemical behavior. Form I behaves as a partly exchangeable cation in interaction with Cu2+ from Cu-trien solution and Ni2+ from Ni-EDTA, that can be used for selective quantitative analysis. On heating above the dehydration temperature (∼100–150°C) montmorillonite with Fe3+ in form I is converted to a mica-like structure and Fe3+ ions are fixed more strongly in the montmorillonite structure. Form II behaves similarly to hydrous ferric oxides, but its thermal crystallization to hematite is postponed to ∼500–600°C. The Fe3+ cations in the interlayer space are much less thermally stable than Al pillars in pillared interlayered clays (PILCs). Form I is more active in oxidative dehydrogenation of propane, while form II is the active species in sorption of As and the non-specific combustion of propane. To produce only form II by the treatment of montmorillonite with Fe3+, its load must be kept below ∼20 wt.%; otherwise the usual hydrous ferric oxides are formed.

Keywords

As sorptionFe-montmorilloniteFe-bentoniteOxidative Dehydrogenation of PropanePillaringSpeciation of Fe
Type
Research Article
Information
Clays and Clay Minerals , Volume 55 , Issue 2 , April 2007 , pp. 165 - 176
Copyright
Copyright © 2007, The Clay Minerals Society

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