One-pot synthesis of lamellar mordenite and ZSM-5 zeolites and subsequent pillaring by amorphous SiO2
- 10 Downloads
Two zeolite structures (mordenite and ZSM-5) were crystallized as a mesostructure by a one-pot hydrothermal method using a supramolecular assembly and applying cetyltrimethylammonium bromide (CTAB) as a surfactant. The as-prepared materials were subjected to a pillaring process with amorphous SiO2 forming MFI-P and MOR-P pillared systems. The textural properties were significantly improved due to the efficient pillaring process, i.e., surface areas increased from 255 to 687 m2/g for MFI and from 393 to 710 m2/g for MOR. The zeolitic materials grew in the form of lamellar mesostructures when CTAB was used as a bulk filler between the laminar arrays of zeolites as revealed by transmission electron microscopy and X-ray diffraction. The lamella sizes were in the range of ~ 2.5 nm, which is similar to one unit cell of the growing zeolite for both samples. These results are consistent with the theoretical calculations obtained by the Powdercell program for the X-ray diffraction powder pattern of the mesostructured lattice for both samples. It was found that calcining of the as-synthesized samples at 550 °C leads to a non-congruent collapse of the mesostructure.
KeywordsMordenite ZSM-5 Lamellar Synthesis Pillaring
The authors are grateful to SENER-CONACyT for financial support through Project 117373, and wish to thank E. Aparicio, I. Gradilla, E. Flores, P. Casillas, J. Mendoza and F. Ruiz for valuable technical assistance. M. I. Perez Montfort corrected the English version of the manuscript.
All authors have given approval to the final version of the manuscript.
Compliance with ethical standards
Conflict of interest
The authors declare that they have no conflict of interest.
- Baerlocher C, McCusker LB (1996) http://www.iza-structure.org/databases/. Accessed 2016
- Huang J, Lin Y, Liu S, Liu Q, Sun Y, Liang Y, Chen Y, Fu R, Wu D (2018) A stepwise crosslinking strategy toward lamellar carbon frameworks with covalently connected alternate layers of porous carbon nanosheets and porous carbon spacers. Chem Commun 54:10332. https://doi.org/10.1039/c8cc05479g CrossRefGoogle Scholar
- McNaught AD, Wilkinson A, Jenkins AD, International Union of P, Applied C (2006) IUPAC compendium of chemical terminology: the gold book. International Union of Pure and Applied Chemistry, Research Triangle ParkGoogle Scholar
- Wu Y, Emdadi L, Schulman E, Shu Y, Tran DT, Wang X, Liu D (2018b) Overgrowth of lamellar silicalite-1 on MFI and BEA zeolites and its consequences on non-oxidative methane aromatization reaction. Microporous Mesoporous Mater 263:1–10. https://doi.org/10.1016/j.micromeso.2017.11.040 CrossRefGoogle Scholar
- Xu R, Pang W, Yu J, Huo Q, Chen J (2009) Chemistry of zeolites and related porous materials: synthesis and structure. Wiley, SingaporeGoogle Scholar
- Yocupicio RI, Díaz de-León JN, Zepeda TA, Fuentes S (2017) Study of CoMo catalysts supported on hierarchical mesoporous zeolites for hydrodesulfurization of dibenzotihophene. Rev Mex Ing Quim 16:503–520Google Scholar