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  Transition from 2D to 3D SBA‐15 by High‐Temperature Fluoride Addition and its Impact on the Surface Reactivity Probed by Isopropanol Conversion

Lamoth, M., Gries, T., Girgsdies, F., Seitz, F., Hashagen, M., Rosowski, F., et al. (2020). Transition from 2D to 3D SBA‐15 by High‐Temperature Fluoride Addition and its Impact on the Surface Reactivity Probed by Isopropanol Conversion. Chemistry – A European Journal, 26(50), 11571-11583. doi:10.1002/chem.202001646.

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 Creators:
Lamoth, Maximilian1, Author              
Gries, Thomas1, Author              
Girgsdies, Frank1, Author              
Seitz, Friedrich1, Author              
Hashagen, Maike1, Author              
Rosowski, Frank2, 3, Author
Schögl, Robert1, 4, Author              
Frei, Elias1, Author              
Affiliations:
1Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              
2BasCat—UniCat BASF Joint Lab, Technical University Berlin, 10623 Berlin, Germany, ou_persistent22              
3Process Research and Chemical Engineering, Process Catalysis Research, BASF SE, 67063 Ludwigshafen, Germany, ou_persistent22              
4Department of Inorganic Chemistry, Fritz Haber Institute of the Max Planck Society, Faradayweg 4-6, 14195 Berlin, Germany, ou_persistent13              

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 Abstract: A systematic variation of the SBA‐15 synthesis conditions and their impact on the structural and chemical characteristics are reported. An incremental alteration of the hydrothermal aging temperature and time was used to induce changes of the highly ordered SBA‐15 structure. Any effects on the total surface area, mesopores size, micropore contributions, and pore connectivity are amplified by a combined incremental increase of the NH4F concentration. Based on changes of the unit‐cell parameter as a function of the mesopore size, and a feature in the low‐angle XRD pattern, useful descriptors for the disorder of the corresponding SBA‐15 are identified. An additional analysis of the Brunauer–Emmett–Teller (BET) surface area and pore size distributions enables investigations of the structural integrity of the material. This systematic approach allows the identification of coherencies between the evolution of physical SBA‐15 properties. The obtained correlations of the surface and structural characteristics allow the discrimination between highly ordered 2D SBA‐15, disordered 3D SBA‐15, and highly nonuniform silica fractions with mainly amorphous character. The fluoride‐induced disintegration of the silica structure under hydrothermal conditions was also verified by TEM. A direct influence of the structural adaption on the chemical properties of the surface was demonstrated by isopropanol conversion and H/D exchange monitored by FTIR analysis as sensitive probes for acid and redox active surface sites.

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Language(s): eng - English
 Dates: 2020-05-062020-04-052020-05-192020-05-192020-09-04
 Publication Status: Published in print
 Pages: 13
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1002/chem.202001646
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Title: Chemistry – A European Journal
  Other : Chem. – Eur. J.
  Other : Chem. Eur. J.
Source Genre: Journal
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Publ. Info: Weinheim : Wiley-VCH
Pages: 13 Volume / Issue: 26 (50) Sequence Number: - Start / End Page: 11571 - 11583 Identifier: ISSN: 0947-6539
CoNE: https://pure.mpg.de/cone/journals/resource/954926979058