Abstract
The ZrO2-pillared clay with high acidic property has been prepared by reacting 1 wt% colloidal suspension of Na+-montmorillonite with 1 N aqueous solution of ZrOCl2·8H2O and by subsequent heating. The evolution of local structure around zirconium of the intercalant stabilized in-between aluminosilicate layers upon intercalating, drying, and pillaring condition has been systematically studied by X-ray absorption spectroscopy, and compared to those of reference compounds such as ZrO2, and ZrOCl2 · 8H2O and its 1 N aqueous solution. The intercalated zirconium species was identified as the Zr-tetramer, [Zr4(OH)14(H2O)10]2+, with an average molecular volume of 10 × 10 Å2 and a thickness of 4.5 Å. Also it becomes more condensed upon drying and eventually transforms to a zirconium oxide pillar upon calcination.
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Acknowledgments
This research is financially supported by Korean Research Foundation Grant (KRF-2004-041-C00187), and in part by the SRC program of the Korea Science and Engineering Foundation (KOSEF, R11-2005-008-01001-0). We thank Prof. M. Nomura in the Photon Factory of the High Energy Accelerator Research Organization for supporting the synchrotron radiation experiments.
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Jung, H., Paek, SM., Yoon, JB. et al. Zr K-edge XAS study on ZrO2-pillared aluminosilicate. J Porous Mater 14, 369–377 (2007). https://doi.org/10.1007/s10934-006-9002-5
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DOI: https://doi.org/10.1007/s10934-006-9002-5