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Influence of Synthesis Conditions and Cerium Incorporation on the Properties of Zr-Pillared Clays
Published in
2003
Volume: 10
   
Issue: 2
Pages: 93 - 103
Abstract
Zr-pillared clays were prepared from ZrOCl2 pillaring solutions by adopting different preparative conditions. Ce3+ ions are introduced to Zr-pillared clays by co-intercalation method. The resulting samples were characterized by XRD, TGA, N2 sorption and UV-VIS-Diffuse reflectance spectroscopy techniques. Basal spacings in the range of 18-21 Å were observed depending upon the preparative condition. TG analysis shows three weight loss regions corresponding to removal of various types of water molecules. All pillared clays show Type-I sorption isotherm typical of microporous materials. Pillaring under refluxing condition is found to have beneficial effect on the surface area and pore volume of the Zr-pillared clay. The chemical environment and location of Ce3+ ions is studied by UV-VIS-DRS. The Ce3+ ions are found to be present in the micropores of the Zr-pillared clays. However heat treatment at higher temperature may result in peripheral interaction between Ce3+ ions and Zr-pillars. Catalytic activity of these pillared clays was evaluated for cyclohexanol dehydration which correlates well with the Brønsted acidity of these materials. The Zr-Pillared clay containing Ce3+ ions show good catalytic activity and stability with reaction time which has been ascribed to the stabilazition of the Brønsted acidic centers.
About the journal
JournalJournal of Porous Materials
ISSN13802224
Open AccessNo
Concepts (16)
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    Catalyst activity
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    Dehydration
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    Intercalation compounds
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    Isotherms
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    Porous materials
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    Solutions
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    Sorption
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    Stabilization
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    Surface chemistry
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    Thermogravimetric analysis
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    Ultraviolet spectroscopy
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    X ray diffraction analysis
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    Zirconium compounds
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    SORPTION ISOTHERMS
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    Structural stability
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    Clay