title: A Stable Extra-Large-Pore Zeolite with Intersecting 14- and 10-Membered-Ring Channels.
abstract: The development of inorganic frameworks with extra-large pores (larger than 12-membered rings) has attracted considerable attention because of their potential applications in catalysis, the separation of large molecules, and so forth. We herein report the synthesis of the new extra-large-pore zeolite NUD-2 by using the supramolecular self-assembly of simple aromatic organic cations as structure-directing agents (SDAs). NUD-2 is a high-silicon-content germanosilicate with interconnecting 14×10-membered-ring channels. The SDAs in NUD-2 can be removed by calcination in air at 550 °C to yield permanent pores with a BET surface area of 500 m(2) g(-1) . Both germanium and organic cations in NUD-2 can also be removed by treatment with acid at lower temperature, thus not only affording recycling of germanium and SDAs, but also providing a highly stable siliceous zeolite. In addition, aluminum ions can be incorporated into the framework of NUD-2. The NUD-2 structure is yet another extra-large-pore zeolite synthesized by using the supramolecular self-assembling templating approach, thus demonstrating that this approach is a general and applicable strategy for synthesis of new large- and extra-large-pore zeolites.
authors.affiliation: State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P.R. China.
authors.forename: Zi-Hao
authors.initials: ZH
authors.lastname: Gao
authors.affiliation: State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P.R. China.|Department of Chemistry, Bengbu Medical College, Bengbu, 233030, P.R. China.
authors.forename: Fei-Jian
authors.initials: FJ
authors.lastname: Chen
authors.affiliation: State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P.R. China.
authors.forename: Lei
authors.initials: L
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P.R. China.
authors.forename: Lin
authors.initials: L
authors.lastname: Sun
authors.affiliation: College of Chemistry and Chemical Engineering, State Key Laboratory of Materials-Oriented Engineering, Nanjing Tech University, Nanjing, 210009, P.R. China. yanxu@njtech.edu.cn.
authors.forename: Yan
authors.initials: Y
authors.lastname: Xu
authors.affiliation: State Key Laboratory of Coordination Chemistry, Collaborative Innovation Center of Chemistry for Life Sciences, School of Chemistry and Chemical Engineering, Nanjing University, Nanjing, 210093, P.R. China. hbdu@nju.edu.cn.
authors.forename: Hong-Bin
authors.initials: HB
authors.lastname: Du
keywords: germanium; silicates; structure elucidation; synthesis design; zeolites