Suchergebnisse

[EN] A new germanosilicate zeolite (denoted as ITQ-53) with extra-large pores has been synthesised using tri-tertbutylmethylphosphonium cation as the organic structure directing agent (OSDA). Rotation electron diffraction (RED) was used to identify ITQ-53 from an initially-synthesised sample containing impurities, and to solve its structure. The structure was refined against PXRD data of pure ITQ-53 samples obtained after synthesis optimisation. ITQ-53 is the first example of extra-large pore zeolites with tri-directional interconnected 14 x 14 x 14-ring channels. It is stable up to at least 650 degrees C. The structure of ITQ-53 changes from monoclinic to orthorhombic upon calcination. ; This work was supported by the Spanish Government (MAT2012-38567-C02-01, Consolider Ingenio 2010-Multicat CSD-2009-00050 and Severo Ochoa SEV-2012-0267), the Swedish Research Council (VR), the Swedish Governmental Agency for Innovation Systems (VINNOVA) and the Knut & Alice Wallenberg Foundation through a grant for purchasing the TEMs and the project grant 3DEM-NATUR. Yifeng Yun thanks the China Scholarship Council (CSC). ; Yun, Y.; Hernández Rodríguez, M.; Wan, W.; Zou, X.; Jorda Moret, JL.; Cantin Sanz, A.; Rey Garcia, F. (2015). The first zeolite with a tri-directional extra-large 14-ring pore system derived using a phosphonium-based organic molecule. Chemical Communications. 51(36):7602-7605. https://doi.org/10.1039/c4cc10317c ; S ; 7602 ; 7605 ; 51 ; 36 ; C. Baerlocher and L.McCusker, Database of Zeolite Structures: http://www.iza-structure.org/databases/ ; Estermann, M., McCusker, L. B., Baerlocher, C., Merrouche, A., & Kessler, H. (1991). A synthetic gallophosphate molecular sieve with a 20-tetrahedral-atom pore opening. Nature, 352(6333), 320-323. doi:10.1038/352320a0 ; Su, J., Wang, Y., Lin, J., Liang, J., Sun, J., & Zou, X. (2013). A silicogermanate with 20-ring channels directed by a simple quaternary ammonium cation. Dalton Trans., 42(5), 1360-1363. doi:10.1039/c2dt32231e ; Wei, Y., Tian, Z., Gies, H., ...