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  The interaction of Hydrazine with an Fe(111)-surface

Grunze, M. (1979). The interaction of Hydrazine with an Fe(111)-surface. Surface Science, 81(2), 603-625. doi:10.1016/0039-6028(79)90123-7.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0001-77C9-7 Version Permalink: https://hdl.handle.net/21.11116/0000-0001-77CA-6
Genre: Journal Article

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SurfaceSci_81_1979_603.pdf (Any fulltext), 2MB
 
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Grunze, M.1, Author           
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1Cellular Biophysics, Max Planck Institute for Medical Research, Max Planck Society, ou_2364731              

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 Abstract: The interaction of hydrazine with a clean and nitrogen precovered Fe(111) surface was investigated in the temperature range of 126–600 K by means of UV and X-ray photoelectron spectroscopy (PES). At temperatures below 170 K the molecular adsorption of hydrazine is followed by multilayer condensation. In going from adsorbed to condensed hydrazine the valence and core levels shift in different directions relative to the vertical gas phase ionisation energies indicating strong interactions via hydrogen bonding in the condensed phase. Dissociative adsorption of N2H4 was observed at temperatures above 220 K. At room temperature no difference in the photoelectron spectra following the adsorption of N2H4 or NH3 was observed indicating the presence of the same surface species, predominantly being -NH2 radicals. Preadsorbed nitrogen stabilizes N2H4 against decomposition. The results will be discussed in view of possible intermediates in the ammonia-synthesis reaction on iron. Simple thermochemical arguments are presented to explain the observed difference in the heterogeneous dissociation mechanism of hydrazine on transition metals. General conclusions on the mechanism of ammonia synthesis on various transition metals can also be derived from these thermodynamic considerations.

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Language(s): eng - English
 Dates: 1978-07-271978-05-261979-03-01
 Publication Status: Issued
 Pages: 23
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 Rev. Type: Peer
 Identifiers: DOI: 10.1016/0039-6028(79)90123-7
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Title: Surface Science
  Abbreviation : Surf. Sci.
Source Genre: Journal
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Publ. Info: Amsterdam : Elsevier
Pages: - Volume / Issue: 81 (2) Sequence Number: - Start / End Page: 603 - 625 Identifier: Other: 0039-6028
CoNE: https://pure.mpg.de/cone/journals/resource/0039-6028