Synthesis of all-silica zeolites from highly concentrated gels containing hexamethonium cations

Handle URI:
http://hdl.handle.net/10754/562227
Title:
Synthesis of all-silica zeolites from highly concentrated gels containing hexamethonium cations
Authors:
Liu, Xiaolong; Ravon, Ugo; Tuel, Alain
Abstract:
A pure and highly crystalline all-silica EU-1 zeolite has been obtained from the crystallization of gels containing very low water contents in the presence of hexamethonium cations. Decreasing the water content in the gel down to H 2O/Si < 1 inhibited the formation of ZSM-48, which is usually observed under more diluted standard crystallization conditions. Moreover, addition of NH 4F to the synthesis led to the formation of "half-fluorinated" ITQ-13 in which fluoride anions occupied only the center of D4R cages. In larger cages, the charge of the template was compensated by framework connectivity defects, clearly demonstrating once more the essential role of F - in the formation of D4R units. The formation of such hybrid (F,OH) is particularly interesting from a synthesis point of view, particularly for understanding the respective roles of fluoride and hydroxide anions in the crystallization process. © 2012 Elsevier Inc. All rights reserved.
KAUST Department:
KAUST Catalysis Center (KCC)
Publisher:
Elsevier BV
Journal:
Microporous and Mesoporous Materials
Issue Date:
Jul-2012
DOI:
10.1016/j.micromeso.2012.03.001
Type:
Article
ISSN:
13871811
Sponsors:
This publication is based on the work supported by Award No. UK-C0017, made by King Abdullah University of Science and Technology (KAUST). The authors would like to thank Dr. Aude Demessence 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.accessioned2015-08-03T09:57:10Zen
dc.date.available2015-08-03T09:57:10Zen
dc.date.issued2012-07en
dc.identifier.issn13871811en
dc.identifier.doi10.1016/j.micromeso.2012.03.001en
dc.identifier.urihttp://hdl.handle.net/10754/562227en
dc.description.abstractA pure and highly crystalline all-silica EU-1 zeolite has been obtained from the crystallization of gels containing very low water contents in the presence of hexamethonium cations. Decreasing the water content in the gel down to H 2O/Si < 1 inhibited the formation of ZSM-48, which is usually observed under more diluted standard crystallization conditions. Moreover, addition of NH 4F to the synthesis led to the formation of "half-fluorinated" ITQ-13 in which fluoride anions occupied only the center of D4R cages. In larger cages, the charge of the template was compensated by framework connectivity defects, clearly demonstrating once more the essential role of F - in the formation of D4R units. The formation of such hybrid (F,OH) is particularly interesting from a synthesis point of view, particularly for understanding the respective roles of fluoride and hydroxide anions in the crystallization process. © 2012 Elsevier Inc. All rights reserved.en
dc.description.sponsorshipThis publication is based on the work supported by Award No. UK-C0017, made by King Abdullah University of Science and Technology (KAUST). The authors would like to thank Dr. Aude Demessence for SEM pictures.en
dc.publisherElsevier BVen
dc.subjectConcentrated gelsen
dc.subjectEU-1en
dc.subjectHexamethoniumen
dc.subjectITQ-13en
dc.subjectZeoliteen
dc.titleSynthesis of all-silica zeolites from highly concentrated gels containing hexamethonium cationsen
dc.typeArticleen
dc.contributor.departmentKAUST Catalysis Center (KCC)en
dc.identifier.journalMicroporous and Mesoporous Materialsen
dc.contributor.institutionUniv Lyon 2, Inst Rech Catalyse & Environm Lyon IRCELYON, UMR 5256, CNRS, F-69626 Villeurbanne, Franceen
kaust.authorRavon, Ugoen
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