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Title: The Synthesis and Structure of SSZ-73: an All-Silica Zeolite with an Unusual Framework Topology

Abstract

This paper reports the synthesis, characterization, and crystallographic studies of the new all-silica zeolite SSZ-73. The framework topology of SSZ-73 is isostructural with the aluminophosphate STA-6 (SAS). SSZ-73 is prepared from fluoride-containing gels using 3-ethyl-1,3,8,8-tetramethyl-3-azoniabicyclo[3.2.1]octane cation as a structure-directing agent. SSZ-73 is an all-silica zeolite with a one-dimensional system of eight-ring pores. However, SSZ-73 possesses a remarkably high micropore volume (0.25 cm{sup 3}/g) due to the rather large cages in the structure. A single-crystal X-ray diffraction study of the as-made material shows that fluoride resides within the double six-ring cages of the SAS framework. Molecular docking studies were performed for the two geometric isomers of the structure-directing agent in the all-silica frameworks of SAS, RTH, ITE, and STF. The studies suggest that the isomer with the ethyl group cis to the bridgehead carbon is the likely structure-directing agent for SSZ-73 and that the other isomer may be responsible for the small amounts of RTH impurity observed in some preparations of SSZ-73.

Authors:
; ; ; ; ;
Publication Date:
Research Org.:
Brookhaven National Laboratory (BNL) National Synchrotron Light Source
Sponsoring Org.:
Doe - Office Of Science
OSTI Identifier:
929943
Report Number(s):
BNL-80538-2008-JA
Journal ID: ISSN 0897-4756; CMATEX; TRN: US200822%%941
DOE Contract Number:
DE-AC02-98CH10886
Resource Type:
Journal Article
Resource Relation:
Journal Name: Chemistry of Materials; Journal Volume: 19
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ZEOLITES; SILICA; SYNTHESIS; CRYSTALLOGRAPHY; ISOMERS; national synchrotron light source

Citation Formats

Wragg,D., Morris, R., Burton, A., Zones, S., Ong, K., and Lee, G.. The Synthesis and Structure of SSZ-73: an All-Silica Zeolite with an Unusual Framework Topology. United States: N. p., 2007. Web. doi:10.1021/cm0705284.
Wragg,D., Morris, R., Burton, A., Zones, S., Ong, K., & Lee, G.. The Synthesis and Structure of SSZ-73: an All-Silica Zeolite with an Unusual Framework Topology. United States. doi:10.1021/cm0705284.
Wragg,D., Morris, R., Burton, A., Zones, S., Ong, K., and Lee, G.. Mon . "The Synthesis and Structure of SSZ-73: an All-Silica Zeolite with an Unusual Framework Topology". United States. doi:10.1021/cm0705284.
@article{osti_929943,
title = {The Synthesis and Structure of SSZ-73: an All-Silica Zeolite with an Unusual Framework Topology},
author = {Wragg,D. and Morris, R. and Burton, A. and Zones, S. and Ong, K. and Lee, G.},
abstractNote = {This paper reports the synthesis, characterization, and crystallographic studies of the new all-silica zeolite SSZ-73. The framework topology of SSZ-73 is isostructural with the aluminophosphate STA-6 (SAS). SSZ-73 is prepared from fluoride-containing gels using 3-ethyl-1,3,8,8-tetramethyl-3-azoniabicyclo[3.2.1]octane cation as a structure-directing agent. SSZ-73 is an all-silica zeolite with a one-dimensional system of eight-ring pores. However, SSZ-73 possesses a remarkably high micropore volume (0.25 cm{sup 3}/g) due to the rather large cages in the structure. A single-crystal X-ray diffraction study of the as-made material shows that fluoride resides within the double six-ring cages of the SAS framework. Molecular docking studies were performed for the two geometric isomers of the structure-directing agent in the all-silica frameworks of SAS, RTH, ITE, and STF. The studies suggest that the isomer with the ethyl group cis to the bridgehead carbon is the likely structure-directing agent for SSZ-73 and that the other isomer may be responsible for the small amounts of RTH impurity observed in some preparations of SSZ-73.},
doi = {10.1021/cm0705284},
journal = {Chemistry of Materials},
number = ,
volume = 19,
place = {United States},
year = {Mon Jan 01 00:00:00 EST 2007},
month = {Mon Jan 01 00:00:00 EST 2007}
}