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Title: CIT-7, a crystalline, molecular sieve with pores bounded by 8 and 10-membered rings

Abstract

A new crystalline molecular sieve, denoted CIT-7, is synthesized using an imidazolium-based diquaternary organic structure directing agent (OSDA). The framework structure is determined from a combination of rotation electron diffraction and synchrotron X-ray powder diffraction data. The structure has 10 crystallographically unique tetrahedral atoms (T-atoms) in the unit cell, and can be described as an ordered arrangement of the [4 25 46 2] mtw building unit and a previously unreported [4 45 2] building unit. The framework contains a 2-dimensional pore system that is bounded by 10 T-atom rings (10-ring, 5.1 Å × 6.2 Å opening) that are connected with oval 8-rings (2.9 Å × 5.5 Å opening) through medium-sized cavities (~7.9 Å) at the channel intersections. CIT-7 can be synthesized over a broad range of compositions including pure-silica and heteroatom, e.g., aluminosilicate and titanosilicate, containing variants.

Authors:
 [1];  [2];  [2];  [1]
  1. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  2. Chevron Energy Technology Company, Richmond, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States). 2-1 Powder Diffraction Beamline at the Stanford Synchrotron Radiation Lightsource.
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1215412
Grant/Contract Number:  
AC03-76SF00515
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Chemical Science
Additional Journal Information:
Journal Volume: 6; Journal Issue: 3; Journal ID: ISSN 2041-6520
Publisher:
Royal Society of Chemistry
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY

Citation Formats

Schmidt, Joel E., Xie, Dan, Rea, Thomas, and Davis, Mark E.. CIT-7, a crystalline, molecular sieve with pores bounded by 8 and 10-membered rings. United States: N. p., 2015. Web. doi:10.1039/C4SC03935A.
Schmidt, Joel E., Xie, Dan, Rea, Thomas, & Davis, Mark E.. CIT-7, a crystalline, molecular sieve with pores bounded by 8 and 10-membered rings. United States. doi:10.1039/C4SC03935A.
Schmidt, Joel E., Xie, Dan, Rea, Thomas, and Davis, Mark E.. Fri . "CIT-7, a crystalline, molecular sieve with pores bounded by 8 and 10-membered rings". United States. doi:10.1039/C4SC03935A. https://www.osti.gov/servlets/purl/1215412.
@article{osti_1215412,
title = {CIT-7, a crystalline, molecular sieve with pores bounded by 8 and 10-membered rings},
author = {Schmidt, Joel E. and Xie, Dan and Rea, Thomas and Davis, Mark E.},
abstractNote = {A new crystalline molecular sieve, denoted CIT-7, is synthesized using an imidazolium-based diquaternary organic structure directing agent (OSDA). The framework structure is determined from a combination of rotation electron diffraction and synchrotron X-ray powder diffraction data. The structure has 10 crystallographically unique tetrahedral atoms (T-atoms) in the unit cell, and can be described as an ordered arrangement of the [425462] mtw building unit and a previously unreported [4452] building unit. The framework contains a 2-dimensional pore system that is bounded by 10 T-atom rings (10-ring, 5.1 Å × 6.2 Å opening) that are connected with oval 8-rings (2.9 Å × 5.5 Å opening) through medium-sized cavities (~7.9 Å) at the channel intersections. CIT-7 can be synthesized over a broad range of compositions including pure-silica and heteroatom, e.g., aluminosilicate and titanosilicate, containing variants.},
doi = {10.1039/C4SC03935A},
journal = {Chemical Science},
number = 3,
volume = 6,
place = {United States},
year = {Fri Jan 23 00:00:00 EST 2015},
month = {Fri Jan 23 00:00:00 EST 2015}
}

Journal Article:
Free Publicly Available Full Text
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Cited by: 14 works
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