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  Self-organization of silicates on different length scales exemplified by amorphous mesoporous silica and mesoporous zeolite beta using multiammonium surfactants

Castro, M., Losch, P., Farès, C., Haouas, M., Taulelle, F., Breynaert, E., et al. (2020). Self-organization of silicates on different length scales exemplified by amorphous mesoporous silica and mesoporous zeolite beta using multiammonium surfactants. RSC Advances, 10(35), 20928-20938. doi:10.1039/D0RA03828H.

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 Creators:
Castro, Maria1, Author              
Losch, Pit1, Author              
Farès, Christophe2, Author              
Haouas, Mohamed3, Author
Taulelle, Francis4, Author
Breynaert, Eric4, Author
Kirschhock, Christine4, Author
Park, Woojin5, Author
Ryoo, Ryong5, Author
Schmidt, Wolfgang1, Author              
Affiliations:
1Research Group Schmidt, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445618              
2Service Department Farès (NMR), Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445623              
3Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay, France, ou_persistent22              
4Center for Surface Chemistry and Catalysis, KU Leuven, Belgium, ou_persistent22              
5CNCR, Institute for Basic Science, Republic of Korea , ou_persistent22              

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 Abstract: In this study the structure directing effect of a gemini-type piperidine-based multi-ammonium surfactant during hydrothermal zeolite synthesis was investigated for two cases: with and without a source of aluminum. The absence of an aluminum source led to the formation of an amorphous mesoporous MCM-48 type silica material, while the presence of aluminum guaranteed the formation of zeolite beta with a hierarchical pore system. The two opposing cases were studied in a time and temperature-dependent manner. The mobility and through space interaction of these large surfactant molecules were studied by liquid state nuclear magnetic resonance (NMR) at a temperature relevant to hydrothermal synthesis (363 K) in pure water and upon addition of an aluminum and silicon source. In the gel state, at different stages of aging and hydrothermal synthesis, low angle X-ray diffraction (XRD) and solid state magic angle spinning nuclear magnetic resonance (1H MAS NMR) spectrometry determined the developing order within the system. At each of these different synthesis steps the respective intermediate materials were calcined. Transmission electron microscopy then allowed closer inspection of the locally developing mesoscopic order, while N2 physisorption was used to follow the evolution of porosity.

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Language(s): eng - English
 Dates: 2020-04-282020-05-212020-06-02
 Publication Status: Published online
 Pages: 11
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1039/D0RA03828H
 Degree: -

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Title: RSC Advances
  Abbreviation : RSC Adv.
Source Genre: Journal
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Publ. Info: Cambridge, UK : Royal Society of Chemistry
Pages: - Volume / Issue: 10 (35) Sequence Number: - Start / End Page: 20928 - 20938 Identifier: ISSN: 2046-2069
CoNE: https://pure.mpg.de/cone/journals/resource/2046-2069