One-pot synthesis of lamellar mordenite and ZSM-5 zeolites and subsequent pillaring by amorphous SiO2

Yocupicio-Gaxiola, Rosario I.; Petranovskii, Vitalii; Antúnez-García, Joel; Fuentes-Moyado, Sergio

doi:10.1007/s13204-018-0935-1

Cited by 8 publications

(8 citation statements)

References 43 publications

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“…For pillared samples, this peak is smoothed and shifted toward small angles (2θ = 2.2 and 1.7° with d = 4.0 and 5.2 nm for MOR-P and MFI-P, respectively), which shows that the introduction of SiO 2 pillars increased the interlamellar space. The present results are consistent with our previously reported data [ 26 ]. A wider interplanar distance d distribution is a clear evidence of the random growing of pillars, that is to say, some distances can be expanded while others can be contracted.…”

Section: Resultssupporting

confidence: 94%

“…Further in the text and in the figures, they will be denoted by three-letter structural codes adopted by the International Zeolite Association (IZA) [ 27 ], as MOR and MFI, using additional abbreviations those are marking a certain stage of preparation. Both materials were synthesized according to the procedure described in our previous work [ 26 ]. Pillaring of the obtained materials was done in accordance with the process proposed by Na et al [ 28 ].…”

Section: Resultsmentioning

confidence: 99%

“…Both sets of materials were synthesized according to the procedure described in our previous work [ 26 ]. Pillaring of the obtained materials was done in accordance with the process proposed by Na et al [ 28 ].…”

Section: Methodsmentioning

confidence: 99%

“…Earlier, we reported on the results of the successful synthesis of 2D ZSM-5 and mordenite [ 26 ]. The aim of this work is by applying multinuclear NMR to follow up changes in the local structure at all the stages of preparation, starting from a freshly synthesized hybrid material, in which the confinement of organic and inorganic layers is implemented, then pillaring between the layers, and finally removal of organic material during calcination.…”

Section: Introductionmentioning

confidence: 99%

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Local Structures of Two-Dimensional Zeolites—Mordenite and ZSM-5—Probed by Multinuclear NMR

et al. 2020

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Mesostructured pillared zeolite materials in the form of lamellar phases with a crystal structure of mordenite (MOR) and ZSM-5 (MFI) were grown using CTAB as an agent that creates mesopores, in a one-pot synthesis; then into the CTAB layers separating the 2D zeolite plates were introduced by diffusion the TEOS molecules which were further hydrolyzed, and finally the material was annealed to remove the organic phase, leaving the 2D zeolite plates separated by pillars of silicon dioxide. To monitor the successive structural changes and the state of the atoms of the zeolite framework and organic compounds at all the steps of the synthesis of pillared MOR and MFI zeolites, the nuclear magnetic resonance method (NMR) with magic angle spinning (MAS) was applied. The 27Al and 29Si MAS NMR spectra confirm the regularity of the zeolite frameworks of the as synthetized materials. Analysis of the 1H and 13C MAS NMR spectra and an experiment with variable contact time evidence a strong interaction between the charged “heads” –[N(CH3)3]+ of CTAB and the zeolite framework at the place of [AlO4]− location. According to 27Al and 29Si MAS NMR the evacuation of organic cations leads to a partial but not critical collapse of the local zeolite structure.

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Section: Resultssupporting

confidence: 94%

Section: Resultsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Local Structures of Two-Dimensional Zeolites—Mordenite and ZSM-5—Probed by Multinuclear NMR

et al. 2020

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“…These pores can be intracrystalline, intercrystalline (between individual crystallites in agglomerated intergrowths), or inner space in materials such as layered pillared zeolites ( Feliczak-Guzik, 2018 ). Pore-related characteristics, associated with the presence of pores of different diameters, determine specific applications of hierarchical zeolites, in particular, where diffusion within materials is of interest ( Christensen et al, 2007 ; Pérez-Ramírez et al, 2008 ; Yocupicio-Gaxiola, et al, 2019 ).…”

Section: Introductionmentioning

confidence: 99%

Recent Advances in Catalysis Based on Transition Metals Supported on Zeolites

et al. 2021

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This article reviews the current state and development of thermal catalytic processes using transition metals (TM) supported on zeolites (TM/Z), as well as the contribution of theoretical studies to understand the details of the catalytic processes. Structural features inherent to zeolites, and their corresponding properties such as ion exchange capacity, stable and very regular microporosity, the ability to create additional mesoporosity, as well as the potential chemical modification of their properties by isomorphic substitution of tetrahedral atoms in the crystal framework, make them unique catalyst carriers. New methods that modify zeolites, including sequential ion exchange, multiple isomorphic substitution, and the creation of hierarchically porous structures both during synthesis and in subsequent stages of post-synthetic processing, continue to be discovered. TM/Z catalysts can be applied to new processes such as CO2 capture/conversion, methane activation/conversion, selective catalytic NOx reduction (SCR-deNOx), catalytic depolymerization, biomass conversion and H2 production/storage.

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