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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, Maria; Losch, Pit; Farès, Christophe; Haouas, Mohamed; Taulelle, Francis; Breynaert, Eric; Kirschhock, Christine; Park, Woojin; Ryoo, Ryong; Schmidt, Wolfgang.
Afiliación
  • Castro M; Max-Planck-Institut für Kohlenforschung Germany schmidt@mpi-muelheim.mpg.de.
  • Losch P; Max-Planck-Institut für Kohlenforschung Germany schmidt@mpi-muelheim.mpg.de.
  • Farès C; Max-Planck-Institut für Kohlenforschung Germany schmidt@mpi-muelheim.mpg.de.
  • Haouas M; Institut Lavoisier de Versailles, UVSQ, CNRS, Université Paris-Saclay France.
  • Taulelle F; Center for Surface Chemistry and Catalysis, KU Leuven Belgium.
  • Breynaert E; Center for Surface Chemistry and Catalysis, KU Leuven Belgium.
  • Kirschhock C; Center for Surface Chemistry and Catalysis, KU Leuven Belgium.
  • Park W; CNCR, Institute for Basic Science Republic of Korea.
  • Ryoo R; CNCR, Institute for Basic Science Republic of Korea.
  • Schmidt W; Max-Planck-Institut für Kohlenforschung Germany schmidt@mpi-muelheim.mpg.de.
RSC Adv ; 10(35): 20928-20938, 2020 May 27.
Article en En | MEDLINE | ID: mdl-35517752
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.

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: RSC Adv Año: 2020 Tipo del documento: Article

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: RSC Adv Año: 2020 Tipo del documento: Article