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Synthesis of Silicate Zeolite Analogues Using Organic Sulfonium Compounds as Structure‐Directing Agents
Author(s) -
Jo Changbum,
Lee Sungjune,
Cho Sung June,
Ryoo Ryong
Publication year - 2015
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201506678
Subject(s) - zeolite , sulfonium , microporous material , calcination , crystal structure , silicate , chemistry , aluminosilicate , chemical engineering , powder diffraction , hydrothermal synthesis , crystallography , materials science , inorganic chemistry , organic chemistry , hydrothermal circulation , catalysis , salt (chemistry) , engineering
A microporous crystalline silica zeolite of the MEL structure type and three other zeolite analogues composed of germanosilicate frameworks were synthesized using tributylsulfonium, triphenylsulfonium, or tri( para ‐tolyl)sulfonium as the structure‐directing agent. The germanosilicates thus obtained had ISV, ITT, or a new zeolite structure depending on the synthesis conditions. The structure of the new germanosilicate was solved using X‐ray powder diffraction data with the aid of a charge‐flipping method. The solution indicated a crystal structure belonging to the P 63/ mmc space group with cell parameters of a =16.2003 Å and c =21.8579 Å. After calcination, the new germanosilicate material exhibited two types of accessible micropores with diameters of 0.61 and 0.78 nm.