Effect of FeCl3 and acetone on the structure of Na–montmorillonite studied by Mössbauer and XRD measurements |
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Authors: | Andrea Komlósi Ernő Kuzmann Zoltán Homonnay Noémi M. Nagy Shiro Kubuki József Kónya |
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Affiliation: | 1. Isotope Laboratory, Department of Colloid Chemistry, Debrecen University, Debrecen, Hungary 2. Research Group for Nuclear Methods in Structural Chemistry, Hungarian Academy of Sciences, Pázmány P. s. 1/a, Budapest, 1117, Hungary 3. Department of Nuclear Chemistry, E?tv?s Loránd University, Pázmány P. s. 1/a, Budapest, 1117, Hungary
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Abstract: | 57Fe Mössbauer spectroscopy, X-ray diffraction, X-ray fluorescence spectroscopy and infrared spectroscopy were used to study the effect of FeCl3 and acetone on the structure of a Na–bentonite. XRD indicated the incorporation of Fe3+ ions into the interlayer space since the basal lattice spacing of montmorillonite increased to 1.6 from 1.24 nm after treatment with FeCl3 dissolved in acetone. Interlayer Na+ ions could be exchanged to Fe3+. Magnetically split Mössbauer subspectra with internal magnetic fields 41 and 46 T at 74 K, were associated with two main Fe3+ microenvironments within the interlayer regions. The resultant Fe–montmorillonite was successfully applied as a catalyst in the preparation of 1,1-diacetates from aromatic aldehydes and acetic acid anhydride. |
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Keywords: | bentonite montmorillonite M?ssbauer spectroscopy XRD |
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