SSZ-53 and SSZ-59: two novel extra-large pore zeolites |
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Authors: | Burton Allen Elomari Saleh Chen Cong-Yan Medrud Ronald C Chan Ignatius Y Bull Lucy M Kibby Charles Harris Thomas V Zones Stacey I Vittoratos E Steven |
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Institution: | ChevronTexaco Energy Research and Technology Company, 100 Chevron Way, Richmond, CA 94802, USA. buaw@chevrontexaco.com |
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Abstract: | The syntheses, structure solutions, and physicochemical and catalytic characterizations of the novel zeolites SSZ-53 and SSZ-59 are described. SSZ-53 and SSZ-59 were synthesized under hydrothermal conditions with the 1-(4-fluorophenyl)cyclopentylmethyl]trimethyl ammonium cation and 1-1-(4-chlorophenyl)cyclopentylmethyl]-1-methyl azocanium cation, respectively, as structure-directing agents. The framework topology of SSZ-53 was solved with the FOCUS method, and the structure of SSZ-59 was determined by model building. Rietveld refinement of synchrotron X-ray powder diffraction data confirms each proposed model. SSZ-53 and SSZ-59 each possess a one-dimensional channel system delimited by 14-membered rings. Results from transmission electron microscopy, electron diffraction, catalytic experiments (spaciousness index and constraint index tests), and argon and hydrocarbon adsorption experiments are consistent with the proposed structures. |
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Keywords: | SSZ‐53 SSZ‐59 structure elucidation synthetic methods zeolites |
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