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

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.
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:
OSTI Identifier:
1215412
Grant/Contract Number:
AC03-76SF00515
Type:
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
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)
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY