caa a22 4500 606196315 CHVBK 20210128100923.0 cr unu---uuuuu 210128e20150401xx s 000 0 eng 10.1007/s10934-014-9907-3 doi (NATIONALLICENCE)springer-10.1007/s10934-014-9907-3 Single-crystal structures of Zn2+-exchanged zeolite A: dependence on Zn2+ concentration of aqueous solution during exchange [Elektronische Daten] [Hu Kim, Ha Lee, Young Kim, Sang Choi, Woo Lim] 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 0.05M, followed by vacuum dehydration at 623K. 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. Springer Science+Business Media New York, 2015 Znic nationallicence Ion-exchange nationallicence Zeolite A nationallicence Crystal structure nationallicence Kim Hu Department of Applied Chemistry, Andong National University, 760-749, Andong, Korea aut Lee Ha Department of Applied Chemistry, Andong National University, 760-749, Andong, Korea aut Kim Young Department of Environmental Engineering, Andong National University, 760-749, Andong, Korea aut Choi Sang Department of Environmental Engineering, Kyungpook National University, 702-701, Daegu, Korea aut Lim Woo Department of Applied Chemistry, Andong National University, 760-749, Andong, Korea aut Journal of Porous Materials Springer US; http://www.springer-ny.com 22/2(2015-04-01), 387-394 1380-2224 22:2<387 2015 22 10934 https://doi.org/10.1007/s10934-014-9907-3 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s10934-014-9907-3 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Kim Hu Department of Applied Chemistry, Andong National University, 760-749, Andong, Korea aut NATIONALLICENCE 700 1- Lee Ha Department of Applied Chemistry, Andong National University, 760-749, Andong, Korea aut NATIONALLICENCE 700 1- Kim Young Department of Environmental Engineering, Andong National University, 760-749, Andong, Korea aut NATIONALLICENCE 700 1- Choi Sang Department of Environmental Engineering, Kyungpook National University, 702-701, Daegu, Korea aut NATIONALLICENCE 700 1- Lim Woo Department of Applied Chemistry, Andong National University, 760-749, Andong, Korea aut NATIONALLICENCE 773 0- Journal of Porous Materials Springer US; http://www.springer-ny.com 22/2(2015-04-01), 387-394 1380-2224 22:2<387 2015 22 10934