Premium
Synthesis and Structure Determination of SCM‐15: A 3D Large Pore Zeolite with Interconnected Straight 12×12×10‐Ring Channels
Author(s) -
Luo Yi,
Smeets Stef,
Wang Zhendong,
Sun Junliang,
Yang Weimin
Publication year - 2019
Publication title -
chemistry – a european journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.687
H-Index - 242
eISSN - 1521-3765
pISSN - 0947-6539
DOI - 10.1002/chem.201805187
Subject(s) - zeolite , ring (chemistry) , synchrotron , diffraction , crystallography , crystal structure , materials science , powder diffraction , chemistry , physics , catalysis , optics , organic chemistry
A new germanosilicate zeolite named SCM‐15 (Sinopec Composite Material No. 15), the first zeolite containing a 3‐dimensional (3D) channel system with interconnected 12‐, 12‐, and 10‐ring channels (pore sizes: 6.1×7.2, 6.1×7.4, and 5.2×5.9 Å), has been synthesized using neutral 4‐pyrrolidinopyridine as organic structure‐directing agents (OSDAs). Its structure has been determined by combining single‐crystal electron diffraction (SCED) and synchrotron powder X‐ray diffraction (SPXD) data. The unique open framework structure of SCM‐15 is related to that of FOS‐5 ( BEC ), ITQ‐7 ( ISV ), PKU‐16 ( POS ), ITQ‐26 ( IWS ), ITQ‐21, Beta polymorph B, and SU‐78B, since all these framework structures can be constructed from similar chains which are connected through shared 4‐ring or double 4‐ring ( d 4 r ) units. Based on this relation, six topologically reasonable 3D large or extra‐large pore hypothetical zeolites are predicted.