Hierarchical pore structure of zeolite/MCM obtained by supramolecular templating using ionic liquid (C16MI·Cl) as the structure-directing agent

• Published in: Journal of materials science Vol. 55; no. 6; pp. 2343 - 2352
• Main Authors: de Aguiar Pedott, Victor, Bordin, Iemedelais, dos Santos da Silva, Alan, Petkowicz, Diego Ivan, Finkler, Diana Exenberger, do Santos, João Henrique Zimnoch, Dallago, Rogério Marcos, Mignoni, Marcelo L.
• Format: Journal Article
• Language: English
• Published: New York Springer US 01.02.2020; Springer; Springer Nature B.V
• Subjects: Adsorption; Characterization and Evaluation of Materials; Chemical Routes to Materials; Chemistry and Materials Science; Classical Mechanics; Correlation analysis; Crystallography and Scattering Methods; Infrared analysis; Infrared spectroscopy; Ionic liquids; Ions; Materials Science; Polymer Sciences; Porosity; Reflectance; Room temperature; Solid Mechanics; Structural hierarchy; Zeolites
• ISSN: 0022-2461; 1573-4803
• DOI: 10.1007/s10853-019-04117-z

Zeolites are microporous materials with tetrahedral three-dimensional structure; such structure allows the transfer of material through its pores, but small pores prejudice such transfer. One way to overcome these problems is the development of materials combining microporous and mesoporous structures. This study reports the synthesis at room temperature of hierarchical materials, ZSM-5/MCM-48, ZSM-35/MCM-48, ZSM-5/MCM-41 and ZSM-35/MCM-41, from ZSM-5 and ZSM-35 seeds, using ionic liquid (1-hexadecyl-3-methylimidazolium) as supramolecular template. Infrared spectroscopy and attenuated total reflectance analyses confirmed the formation of the materials through the presence of bands at 1220 and 1070 cm −1 . SAXS analyses showed that most of the materials have surface fracture dimensions (3 ≤  α  < 4), except the sample MCM 41/ZSM 5, having a mass fractal structure. Signals in the high-angle region correlated with XRD analysis, confirming the formation of the materials. TGA analysis shows that ionic liquid decomposition occurs at higher temperatures when the ionic liquid is within the material. Finally, the results obtained by textural analysis via N 2 adsorption agreed with data reported in the literature.