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  The structure of zinc and copper oxide species hosted in porous siliceous matrices

Tkachenko, O. P., Klementiev, K. V., Löffler, E., Ritzkopf, I., Schüth, F., Bandyopadhyay, M., et al. (2003). The structure of zinc and copper oxide species hosted in porous siliceous matrices. Physical Chemistry Chemical Physics, 5(19), 4325-4334. doi:10.1039/b303429a.

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 Creators:
Tkachenko, O. P.1, Author
Klementiev, K. V.1, 2, Author
Löffler, E.1, Author
Ritzkopf, I.3, Author              
Schüth, F.3, Author              
Bandyopadhyay, M.4, Author              
Grabowski, S.4, Author              
Gies, H.4, Author
Hagen, V.1, Author
Muhler, M.1, Author
Lu, L. H.5, Author
Fischer, R. A.5, Author
Grünert, W.1, Author
Affiliations:
1Lehrstuhl für Technische Chemie, Ruhr-Universität Bochum, Box 102148, Bochum, Germany, ou_persistent22              
2Hasylab at DESY, Hamburg, Germany, ou_persistent22              
3Research Department Schüth, Max-Planck-Institut für Kohlenforschung, Max Planck Society, ou_1445589              
4Lehrstuhl für Kristallographie, Ruhr-Universität Bochum, Germany, ou_persistent22              
5Lehrstuhl Anorganische Chemie II, Ruhr-Universität Bochum, Germany, ou_persistent22              

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 Abstract: Microporous and mesoporous siliceous phases (MFI, FAU, MCM-48, MCM-41, and SBA-15) were modified with zinc via aqueous and organometallic routes and characterized with techniques that reflect the structure of the matrix, the distribution of zinc over the matrix, and the structure of the zinc oxide species (XRD, nitrogen physisorption, IR spectroscopy, XPS, X-ray absorption fine structure (XAFS), UV-Vis spectroscopy). For comparison, MFI and MCM-48 were modified with copper alone and characterised by XPS/X-ray induced Auger electron spectroscopy and XAFS. From the results, it can be concluded that zinc interacts strongly with the siliceous surfaces, which prevents the formation of ZnO aggregates even when the coverage exceeds the monolayer limit. While zinc could be well distributed over FAU and mesoporous matrices by treatment with diethyl zinc, it remained on the external surface of MFI, possibly due to pore entrance narrowing by adsorbed species. For MCM-48 and MCM-41, the formation of a thin, probably monolayer surface zinc silicate coating was concluded from the data. With an aqueous impregnation technique, strong changes in the pore system of MCM-48 were noted, which indicate rupture of pore walls and partial structural damage. Different from zinc, copper forms small oxide aggregates upon introduction into micro and mesoporous siliceous matrices.

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Language(s): eng - English
 Dates: 2003-03-272003-07-302003-08-272003-10-01
 Publication Status: Published in print
 Pages: 10
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: eDoc: 119456
DOI: 10.1039/b303429a
ISI: 000186173300038
 Degree: -

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Title: Physical Chemistry Chemical Physics
  Abbreviation : Phys. Chem. Chem. Phys.
Source Genre: Journal
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Publ. Info: Cambridge, England : Royal Society of Chemistry
Pages: - Volume / Issue: 5 (19) Sequence Number: - Start / End Page: 4325 - 4334 Identifier: ISSN: 1463-9076
CoNE: https://pure.mpg.de/cone/journals/resource/954925272413_1