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Synthesis, Characterization, and Structure Solution of CIT-5, a New, High-Silica, Extra-Large-Pore Molecular Sieve

Yoshikawa, Masahito and Wagner, Paul and Lovallo, Mark and Tsuji, Katsuyuki and Takewaki, Takahiko and Chen, Cong-Yan and Beck, Larry W. and Jones, Chris and Tsapatsis, Michael and Zones, Stacey I. and Davis, Mark E. (1998) Synthesis, Characterization, and Structure Solution of CIT-5, a New, High-Silica, Extra-Large-Pore Molecular Sieve. Journal of Physical Chemistry B, 102 (37). pp. 7139-7147. ISSN 1520-6106. doi:10.1021/jp982169t.

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The synthesis, structure solution, and characterization of the high-silica molecular sieve CIT-5 (California Institute of Technology Number 5) is described. CIT-5 is synthesized at hydrothermal conditions in the presence of N(16)-methylsparteinium and preferrably lithium cations. The structural solution of CIT-5 shows that it contains one-dimensional pores circumscribed by 14 tetrahedral atoms (14 MR). Rietveld refinement of the synchrotron X-ray powder data gives a symmetry and space group assignment for the structure of Pmn2_1 (no. 31) with refined unit cell parameters of a = 13.6738(8) Å, b = 5.0216(3) Å, and c = 25.4883(7) Å (V = 1750.1 Å^3). Electron diffraction and transmission electron microscopy confirm the space group and the topology of the structure viewed along the [010] direction. Solid-state ^(29)Si NMR spectroscopy results are consistent with the space group assignment. The thermal/hydrothermal stability of CIT-5 compares well to that of other large- and extra-large-pore, high-silica molecular sieves. The acid form of CIT-5 is able to perform hydrocarbon reactions such as cracking and alkylation and shows behaviors that are different from other zeolites.

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Tsapatsis, Michael0000-0001-5610-3525
Davis, Mark E.0000-0001-8294-1477
Additional Information:© 1998 American Chemical Society. Received: May 7, 1998; In Final Form: June 23, 1998. Publication Date (Web): August 21, 1998. We gratefully acknowledge Dr. John Higgins of Air Products and Chemicals Inc. and Dr. D. E. Cox for their assistance in collecting the synchrotron powder XRD data. The data were collected at the X7A beamline at the National Synchrotron Light Source at Brookhaven National Laboratory (Upton, NY), which is supported by the Department of Energy, Division of Material Science and Division of Chemical Sciences. Dr. Chuck Kibby of Chevron is thanked for the collection of argon isotherms, Dr. Ronald C. Medrud of Chevron is thanked for synchrotron powder XRD data collection, and Drs. Tom Harris and Bowman Lee also of Chevron are thanked for the experimental hydrocracking and cracking data. M.T. and M.L. acknowledge support from the David and Lucile Packard Foundation. P.W. thanks Air Products and Chemicals for financial support. Additional financial support for this work was provided by Chevron.
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Department of Energy (DOE)UNSPECIFIED
David and Lucile Packard FoundationUNSPECIFIED
Air Products and Chemicals Inc.UNSPECIFIED
Issue or Number:37
Record Number:CaltechAUTHORS:20171121-081127036
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Official Citation:Synthesis, Characterization, and Structure Solution of CIT-5, a New, High-Silica, Extra-Large-Pore Molecular Sieve. Masahito Yoshikawa, Paul Wagner, Mark Lovallo, Katsuyuki Tsuji, Takahiko Takewaki, Cong-Yan Chen, Larry W. Beck, Chris Jones, Michael Tsapatsis, Stacey I. Zones, and, and Mark E. Davis. The Journal of Physical Chemistry B 1998 102 (37), 7139-7147 DOI: 10.1021/jp982169t
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83385
Deposited By: Tony Diaz
Deposited On:21 Nov 2017 17:11
Last Modified:15 Nov 2021 19:57

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