The Pentatin Cation in Zeolite Y: Thallous Ion Exchange and Crystal Structure of |Sn36Cl11|[Si128Al64O384]-FAU Containing Sn512+, Sn2Cl3+, and Sn3Cl5+

详细信息    查看全文

• 作者：Joon Yeob Kim ; Nam Ho HeoKarl Seff
• 刊名：Journal of Physical Chemistry C
• 出版年：2017
• 出版时间：January 12, 2017
• 年：2017
• 卷：121
• 期：1
• 页码：471-480
• 全文大小：486K
• ISSN：1932-7455

文摘

Sn₅¹²⁺, Sn₂Cl³⁺, and Sn₃Cl⁵⁺ have replaced all of the Tl⁺ ions in the zeolite Tl₇₁–Y (|Tl₇₁|[Si₁₂₁Al₇₁O₃₈₄]-FAU) by thallous ion exchange (TIE), a vapor phase ion exchange method. SnCl₂(g) was allowed to react with Tl₇₁–Y under anhydrous conditions at 673 K for 48 h. The crystal structure of the product, |(Sn₅¹²⁺)_1.70Sn²⁺_27.4Cl^–_10.8|[Si_127.6Al_64.4O₃₈₄]-FAU per unit cell, was determined by single-crystal crystallography at 294 K using synchrotron X-radiation (Fd3̅m, a = 24.758(1) Å). It was refined with all 1465 unique data to the final error indices R₁ = 0.061 and R₂ = 0.208. Its composition was confirmed by scanning electron microscopy energy-dispersive X-ray analysis. Centered tetrahedral Sn₅¹²⁺ clusters center 21% of the sodalite cavities. About 10 Sn²⁺ ions per unit cell near 12-rings are bridged by Cl^– ions to form five Sn₂Cl³⁺ clusters. Similarly, six Sn₃Cl⁵⁺ clusters have formed, each containing one 6-ring and two 12-ring Sn²⁺ ions.