Fluoride removal from double four-membered ring (D4R) units in As-synthesized Ge-containing zeolites

Handle URI:
http://hdl.handle.net/10754/561927
Title:
Fluoride removal from double four-membered ring (D4R) units in As-synthesized Ge-containing zeolites
Authors:
Liu, Xiaolong; Ravon, Ugo; Tuel, Alain
Abstract:
Fluoride anions can be removed from the framework of as-prepared Ge-containing zeolites ITQ-13 and ITQ-17 without modification of the crystallinity and crystal habit. By contrast to all-silica ITQ-13 for which fluoride could not get out from D4R units, F is completely removed from Ge rich zeolites, even from D4R cages. This has been explained by the relaxing effect of germanium, making F less necessary for the stabilization of the small D4R units. Si/Ge ratios are similar in as-prepared and treated zeolites, indicating that the framework composition is not affected by the removal of anions. The fluoride-free zeolites possess XRD patterns similar to those of the as-made solids but their 29Si NMR spectra are significantly different, revealing the sensitivity of the method to the environment of silicon atoms in the framework. The extent of fluoride that can be removed from D4R units depends not only on the framework Ge content but also on the zeolite topology: for similar contents, F is much more easily eliminated from ITQ-17 than from ITQ-13. © 2011 American Chemical Society.
KAUST Department:
KAUST Catalysis Center (KCC)
Publisher:
American Chemical Society (ACS)
Journal:
Chemistry of Materials
Issue Date:
22-Nov-2011
DOI:
10.1021/cm2025735
Type:
Article
ISSN:
08974756
Sponsors:
This publication is based on work supported by Award UK-C0017, made by King Abdullah University of Science and Technology (KAUST). The authors thank Laurence Burel for SEM pictures.
Appears in Collections:
Articles; KAUST Catalysis Center (KCC)

Full metadata record

DC FieldValue Language
dc.contributor.authorLiu, Xiaolongen
dc.contributor.authorRavon, Ugoen
dc.contributor.authorTuel, Alainen
dc.date.accessioned2015-08-03T09:34:17Zen
dc.date.available2015-08-03T09:34:17Zen
dc.date.issued2011-11-22en
dc.identifier.issn08974756en
dc.identifier.doi10.1021/cm2025735en
dc.identifier.urihttp://hdl.handle.net/10754/561927en
dc.description.abstractFluoride anions can be removed from the framework of as-prepared Ge-containing zeolites ITQ-13 and ITQ-17 without modification of the crystallinity and crystal habit. By contrast to all-silica ITQ-13 for which fluoride could not get out from D4R units, F is completely removed from Ge rich zeolites, even from D4R cages. This has been explained by the relaxing effect of germanium, making F less necessary for the stabilization of the small D4R units. Si/Ge ratios are similar in as-prepared and treated zeolites, indicating that the framework composition is not affected by the removal of anions. The fluoride-free zeolites possess XRD patterns similar to those of the as-made solids but their 29Si NMR spectra are significantly different, revealing the sensitivity of the method to the environment of silicon atoms in the framework. The extent of fluoride that can be removed from D4R units depends not only on the framework Ge content but also on the zeolite topology: for similar contents, F is much more easily eliminated from ITQ-17 than from ITQ-13. © 2011 American Chemical Society.en
dc.description.sponsorshipThis publication is based on work supported by Award UK-C0017, made by King Abdullah University of Science and Technology (KAUST). The authors thank Laurence Burel for SEM pictures.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectD4R unitsen
dc.subjectFluorideen
dc.subjectgermaniumen
dc.subjectITQ-13en
dc.subjectITQ-17en
dc.subjectzeolitesen
dc.titleFluoride removal from double four-membered ring (D4R) units in As-synthesized Ge-containing zeolitesen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.identifier.journalChemistry of Materialsen
dc.contributor.institutionUniv Lyon, CNRS, Inst Rech Catalyse & Environm Lyon, IRCELYON,UMR 5256, F-69626 Villeurbanne, Franceen
kaust.authorRavon, Ugoen
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