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Systematic synthesis of zeolites that contain cubic and hexagonal stackings of faujasite sheets

Arhancet, Juan P. and Davis, Mark E. (1991) Systematic synthesis of zeolites that contain cubic and hexagonal stackings of faujasite sheets. Chemistry of Materials, 3 (4). pp. 567-569. ISSN 0897-4756. doi:10.1021/cm00016a001.

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Synthetic cubic faujasite (FAU) has been known for several decades, and it is one of the most studied and commercially important zeolites. Recently, the hexagonal polytype of faujasite has been synthesized by Delprato et al. We have subsequently confirmed the synthesis procedures used to crystallize this new zeolite and have compared some of its physicochemical properties to those of FAU. Also, we have shown that the hexagonal polytype of faujasite (for our purposes denoted as hex) can be dealuminated by contact with SiCl_4 vapor in a manner similar to that used for the dealumination of FAU. The existence of the cubic and hexagonal polytypes of faujasite leads one to speculate on whether zeolites can be synthesized as intergrowths between these two end members at any ratio of two polytype contents. ZSM-20 is an intergrowth of cubic and hexagonal stackings of faujasite sheets, and ZSM-2, ZSM-3, and ZSM-19 may also be intergrowths. The purpose of our work is to explore the possibility of synthesizing zeolites that are comprised of intergrowths of cubic and hexagonal stackings of faujasite sheets and vary in the ratio of cubic/hexagonal content. From Delprato et al., pure hex and FAU can be synthesized from the reaction mixture R·2.4Na_2O·Al_O_3·10SiO_2·140H_2O, where R is 1,4,7,10,13,16-hexaoxacyclooctadecane (18- crown-6) and 1,4,7,10,13-pentaoxacyclopentadecane (15- crown-5), respectively. Thus, in this work we use the reaction mixture (1 - x)R_1·xR_2·2.4Na_2O·Al_2O_3·10SiO_2• 140H_2O, where R_1 = 18-crown-6, R_2 = 15-crown-5, and x is varied as 0 ≤ x ≤ 1.

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Davis, Mark E.0000-0001-8294-1477
Additional Information:© 1991 American Chemical Society. Received January 11, 1991; Revised Manuscript Received April 29, 1991. We thank Dr. J. B. Higgins of the Central Research Laboratory of the Mobil Oil Company for many helpful discussions, Dr. David Young for obtaining the scanning electron micrographs, and Michael J. Annen for collecting the X-ray powder diffraction patterns.
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Official Citation:Systematic synthesis of zeolites that contain cubic and hexagonal stackings of faujasite sheets. Juan P. Arhancet and Mark E. Davis. Chemistry of Materials 1991 3 (4), 567-569. DOI: 10.1021/cm00016a001
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:83360
Deposited By: Tony Diaz
Deposited On:20 Nov 2017 23:08
Last Modified:15 Nov 2021 19:57

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