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Title: Synthesis of an IWW-type germanosilicate zeolite using 5-azonia-spiro[4,4]nonane as a structure directing agent
Authors: Yuan, Ruting ×
Verheyen, Elke
Tuel, Alain
Bals, Sara
Breynaert, Eric
Martens, Johan
Kirschhock, Christine #
Issue Date: Apr-2016
Publisher: CNRS/Gauthier-Villars
Series Title: New Journal of Chemistry
Abstract: An IWW-type zeolite with a Si/Ge ratio of 4.9 is obtained using 5-azonia-spiro[4,4]nonane as a template in
fluoride-free medium under hydrothermal conditions at 175 1C. In an otherwise identical synthesis, using
related 5-azonia-spiro[4,5]decane as a structure directing agent, a mixture of IWW and NON zeolite types
was formed. In the absence of GeO2 from the reactant mixture, pure NON formed. The IWW zeolite was
characterized by XRD, SEM, and HRTEM. The IWW zeolite displayed a unique morphology and could be
calcined at 600 1C without the loss of crystallinity. The Si/Ge ratio of the IWW zeolite was increased by
postsynthesis modification. Part of germanium could be eliminated from the as-synthesized IWW zeolite
by acid leaching using 6 M HCl solution. Also the calcined material could be degermanated. Here the
presence of a silicon source in the acidic leaching solution minimized structural damage. In this way the
Si/Ge ratio of the IWW zeolite was increased from 4.9 up to 10.
ISSN: 1144-0546
Publication status: accepted
KU Leuven publication type: IT
Appears in Collections:Centre for Surface Chemistry and Catalysis
Health Psychology
× corresponding author
# (joint) last author

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