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Single-crystal structures of Zn2+-exchanged zeolite A: dependence on Zn2+ concentration of aqueous solution during exchange

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Abstract

To study the tendency of Zn2+ exchange into zeolite A, two single-crystals of fully dehydrated Zn2+-and Na+-exchanged zeolite A were prepared by the static ion-exchange method using a mixed ion-exchange solution whose Zn(NO3)2:NaNO3 mol ratios were 1:4 (crystal 1) and 3:2 (crystal 2), respectively, with a total concentration of 0.05 M, followed by vacuum dehydration at 623 K. Their single-crystal structures and chemical compositions were determined by single-crystal synchrotron X-ray diffraction techniques and electron probe microanalysis. Their structures were refined to the final error indices R 1/wR 2 = 0.0678/0.2154 and 0.0619/0.1938 for crystals 1 and 2, respectively. In both structures, the 4 Zn2+ ions are located in sodalite unit, whereas, the remaining 4 Na+ ions are located in large cavity. Unit-cell formula of two single-crystal structures is approximately |Zn4Na4|[Si12Al12O48]-LTA. This work shows that the degree of Zn2+ exchange by increasing the initial Zn2+ concentration and decreasing the initial Na+ concentration in given ion-exchange solution does not differ significantly.

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Acknowledgments

The authors wish to thank the staff at Beamline 2D SMC at the Pohang Light Source, Korea, for assistance during data collection. This work was supported by a grant (Contract Number: 2014-0166) from the Research Fund at Andong National University.

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Authors and Affiliations

  1. Department of Applied Chemistry, Andong National University, Andong, 760-749, Korea

    Hu Sik Kim, Ha Young Lee & Woo Taik Lim

  2. Department of Environmental Engineering, Andong National University, Andong, 760-749, Korea

    Young Hun Kim

  3. Department of Environmental Engineering, Kyungpook National University, Daegu, 702-701, Korea

    Sang June Choi

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  1. Hu Sik Kim
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Correspondence to Woo Taik Lim.

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Kim, H.S., Lee, H.Y., Kim, Y.H. et al. Single-crystal structures of Zn2+-exchanged zeolite A: dependence on Zn2+ concentration of aqueous solution during exchange. J Porous Mater 22, 387–394 (2015). https://doi.org/10.1007/s10934-014-9907-3

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