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Evidence for F − /SiO − Anion Exchange in the Framework of As‐Synthesized All‐Silica Zeolites
Author(s) -
Liu Xiaolong,
Ravon Ugo,
Tuel Alain
Publication year - 2011
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.201101237
Subject(s) - zeolite , fluoride , ion , recrystallization (geology) , dissolution , ion exchange , charge exchange , crystallography , inorganic chemistry , chemistry , materials science , catalysis , organic chemistry , geology , paleontology
Not everything changes : Charge‐compensating anions can be exchanged in as‐synthesized zeolite frameworks with changes in both the density of defect sites and of the hydrophobic character of the zeolite. The reversible transformation occurs without dissolution/recrystallization of the zeolite and preserves the size and shape of the crystals (see picture). Fluoride removal is not possible in all‐silica D4R units, for which fluoride ions play a structure‐directing role.