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Synthesis of Extra‐Large‐Pore Zeolite ECNU‐9 with Intersecting 14*12‐Ring Channels
Author(s) -
Yang Boting,
Jiang JinGang,
Xu Hao,
Wu Haihong,
He Mingyuan,
Wu Peng
Publication year - 2018
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.201805535
Subject(s) - zeolite , stacking , ring (chemistry) , materials science , molecule , silicate , tetrahedron , catalysis , block (permutation group theory) , mesoporous material , topology (electrical circuits) , ion exchange , amine gas treating , layer (electronics) , ion , crystallography , chemical engineering , chemistry , nanotechnology , organic chemistry , geometry , mathematics , combinatorics , engineering
Highly crystalline and (hydro)thermally stable zeolites with extra‐large pores [≥14‐ring (14‐R)] are desirable as catalysts. A novel zeolite, ECNU‐9, with an intersecting 14*12‐R channel system was rationally designed and synthesized by a building block strategy, in which the interlayer expansion of a two‐dimensional silicate structure was realized by combining organic amine assisted layer‐stacking reorganization and subsequent silylation with a square‐shaped single 4‐ring (S4R) silane, 1,3,5,7‐tetramethylcyclotetrasiloxane (TMCS). The PLS‐3 precursor was disassembled into building blocks and then intercalated with flexible and removable organic amine pillars to offer enough interlayer spacing for accommodating TMCS molecules. The additionally introduced building blocks interconnected the neighboring layers to construct new 14‐R and 12‐R pores. ECNU‐9 possesses a well‐ordered structure with a novel topology. The corresponding Ti‐ECNU‐9, with tetrahedral Ti ions in the framework, showed superior catalytic performance in the selective epoxidation of bulky alkenes.