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  Reduction of Different GeO2 Polymorphs

Bielz, T., Soisuwan, S., Girgsdies, F., Klötzer, B., & Penner, S. (2012). Reduction of Different GeO2 Polymorphs. The Journal of Physical Chemistry C, 116(18), 9961-9968. doi:10.1021/jp212302y.

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GeO2polymorphs Reduction Penner Revised Version all black.pdf (Any fulltext), 616KB
 
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Bielz, Thomas1, Author
Soisuwan, Soipatta2, Author
Girgsdies, Frank3, Author           
Klötzer, Bernhard1, Author
Penner, Simon1, Author
Affiliations:
1 Institute of Physical Chemistry, University of Innsbruck, Innrain 52a, A-6020 Innsbruck, Austria, ou_persistent22              
2Department of Chemical Engineering, Burapha University, T-20131 Chonburi, Thailand, ou_persistent22              
3Inorganic Chemistry, Fritz Haber Institute, Max Planck Society, ou_24023              

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 Abstract: A combination of volumetric adsorption, thermal desorption and structure-determining methods was used to study and compare the hydrogen reduction behavior of three different GeO2 polymorphs: tetragonal, water-free hexagonal, and water-containing (hydroxylated) commercial hexagonal GeO2. Marked differences in the onset and extent of reduction between the two water-free polymorphs have been observed. Tetragonal GeO2 adsorbs more hydrogen at temperatures T ≤ 673 K and tends to be more easily reducible at low temperatures, but extended Ge metal formation at elevated temperatures is rather suppressed compared to both hexagonal GeO2 phases. Temperature-programmed hydrogen desorption spectra indicate the reduction-induced formation of weakly bonded hydrogen adsorption sites both on hydroxylated and pure hexagonal GeO2. The existence of the most weakly bonded hydrogen is linked to the transformation of initially present hydroxylated species into a tetragonal structure fraction upon annealing at 500 K. Thus, analogous forms of hydrogen were not observed on any of the pure (dehydroxylated) structures.

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Language(s): eng - English
 Dates: 2011-12-212012-04-222012-05-10
 Publication Status: Issued
 Pages: -
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 Rev. Type: Peer
 Identifiers: DOI: 10.1021/jp212302y
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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: 116 (18) Sequence Number: - Start / End Page: 9961 - 9968 Identifier: ISSN: 1932-7447
CoNE: https://pure.mpg.de/cone/journals/resource/954926947766