SSZ-52, a Zeolite with an 18-Layer Aluminosilicate Framework Structure Related to That of the DeNOx Catalyst Cu-SSZ-13

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• 作者：Dan Xie ; Lynne B. McCusker ; Christian Baerlocher ; Stacey I. Zones ; Wei Wan ; Xiaodong Zou
• 刊名：The Journal of the American Chemical Society
• 出版年：2013
• 出版时间：July 17, 2013
• 年：2013
• 卷：135
• 期：28
• 页码：10519-10524
• 全文大小：404K
• 年卷期：v.135,no.28(July 17, 2013)
• ISSN：1520-5126

文摘

A new zeolite (SSZ-52, |(C₁₄H₂₈N)₆Na₆(H₂O)₁₈|[Al₁₂Si₉₆O₂₁₆]), related to the DeNOx catalyst Cu-SSZ-13 (CHA framework type), has been synthesized using an unusual polycyclic quaternary ammonium cation as the structure-directing agent. By combining X-ray powder diffraction (XPD), high-resolution transmission electron microscopy (HRTEM) and molecular modeling techniques, its porous aluminosilicate framework structure (R3̅m, a = 13.6373(1) 脜, c = 44.7311(4) 脜), which can be viewed as an 18-layer stacking sequence of hexagonally arranged (Si,Al)₆O₆ rings (6-rings), has been elucidated. The structure has a three-dimensional 8-ring channel system and is a member of the ABC-6 family of zeolites (those that can be described in terms of 6-ring stacking sequences) like SSZ-13, but it has cavities that are twice as large. The code SFW has been assigned to this new framework type. The large cavities contain pairs of the bulky organic cations. HRTEM and XPD simulations show that stacking faults do occur, but only at the 5鈥?0% level. SSZ-52 has considerable potential as a catalyst in the areas of gas conversion and sequestration.