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http://dx.doi.org/10.5012/bkcs.2014.35.1.243

The Effect of Co2+-Ion Exchange Time into Zeolite Y (FAU, Si/Al = 1.56): Their Single-Crystal Structures  

Seo, Sung Man (Life and Industry Convergence Research Institute, Pusan National University)
Kim, Hu Sik (Department of Applied Chemistry, Andong National University)
Chung, Dong Yong (Decontamination & Decommissioning Research Division, Korea Atomic Energy Research Institute)
Suh, Jeong Min (Department of Bio-Environmental Energy, Pusan National University)
Lim, Woo Taik (Life and Industry Convergence Research Institute, Pusan National University)
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Abstract
Three single crystals of fully dehydrated $Co^{2+}$-exchanged zeolite Y (Si/Al = 1.56) were prepared by the exchange of $Na_{75}$-Y ($|Na_{75}|[Si_{117}Al_{75}O_{384}]$-FAU) with aqueous streams 0.05 M in $Co(NO_3)_2$, pH = 5.1, at 294 K for 6 h, 12 h, and 18 h, respectively, followed by vacuum dehydration at 673 K. Their single-crystal structures were determined by synchrotron X-ray diffraction techniques in the cubic space group Fd3m at 100(1) K. They were refined to the final error indices $R_1/wR_2$ = 0.0437/0.1165, 0.0450/0.1228, and 0.0469/0.1278, respectively. Their unit-cell formulas are $|Co_{29.1}Na_{11.8}H_{5.0}|[Si_{117}Al_{75}O_{384}]$-FAU, $|Co_{29.8}Na_{11.0}H_{4.4}|[Si_{117}Al_{75}O_{384}]$-FAU, and $|Co_{30.3}Na_{9.5}H_{4.9}|[Si_{117}Al_{75}O_{384}]$-FAU, respectively. In all three crystals, $Co^{2+}$ ions occupy sites I, I' and II; $Na^+$ ions are also at site II. The tendency of $Co^{2+}$ exchange slightly increases with increasing contact time as $Na^+$ content and the unit cell constant of the zeolite framework decrease.
Keywords
$Co^{2+}$ ion; Zeolite Y; Ion-exchange time; Fully dehydration; Crystal structure;
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