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 [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.
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- Chevron Energy Technology Company, Richmond, CA (United States)
- Publication Date:
- OSTI Identifier:
- Grant/Contract Number:
- Accepted Manuscript
- Journal Name:
- Chemical Science
- Additional Journal Information:
- Journal Volume: 6; Journal Issue: 3; Journal ID: ISSN 2041-6520
- 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
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
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