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  Hydroxylation of Metal-Supported Sheet-Like Silica Films

Yang, B., Emmez, E., Kaden, W., Yu, X., Boscoboinik, J. A., Sterrer, M., et al. (2013). Hydroxylation of Metal-Supported Sheet-Like Silica Films. The Journal of Physical Chemistry C, 117(16), 8336-8344. doi:10.1021/jp401935u.

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 Creators:
Yang, Bing1, Author              
Emmez, Emre1, Author              
Kaden, William1, Author              
Yu, Xin1, Author              
Boscoboinik, Jorge Anibal1, Author              
Sterrer, Martin1, Author              
Shaikhutdinov, Shamil K.1, Author              
Freund, Hans-Joachim1, Author              
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1Chemical Physics, Fritz Haber Institute, Max Planck Society, ou_24022              

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 Abstract: Adsorption of water on a metal-supported sheet-like silica film was studied by infrared reflection absorption spectroscopy (IRAS) and temperature-programmed desorption (TPD). As expected, the silica surface is essentially hydrophobic. Hydroxo species, primarily in the form of isolated silanols (Si–OH), were observed only upon water condensation at low temperatures and subsequent heating above 200 K. The amounts of silanol species account for less than a few percent of the surface Si atoms, and they are found to be thermally stable up to 900 K. Isotopic experiments showed that hydroxyls form almost exclusively from the adsorbed water molecules and do not undergo scrambling with the lattice oxygen atoms upon heating. Steps within the silica sheet, due to a terraced topography and/or the presence of “holes”, are proposed as the active sites for hydroxylation. The acidic properties of silanol species were studied with CO and NH3 as probe molecules. In the case of ammonia, an H–D exchange reaction was observed between OD species and NH3, and the same reaction was found to occur for OD(OH) and H2O(D2O), respectively. The results are compared with those reported in the literature for amorphous silica.

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Language(s): eng - English
 Dates: 2013-03-272013-02-252013-03-272013-03-272013-04-25
 Publication Status: Published in print
 Pages: 9
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jp401935u
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Project name : STRUBOLI - Structure and Bonding at Oxide-Liquid Interfaces
Grant ID : 280070
Funding program : Funding Programme 7 (FP7)
Funding organization : European Commission (EC)

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Title: The Journal of Physical Chemistry C
  Other : J. Phys. Chem. C
Source Genre: Journal
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Publ. Info: Washington DC : American Chemical Society
Pages: - Volume / Issue: 117 (16) Sequence Number: - Start / End Page: 8336 - 8344 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766