The Adsorption and Surface Reactions of Hydrocarbons on Clean Iridium

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The adsorption of ethane, ethylene, and acetylene on clean iridium in a field emission microscope was found to cause characteristic changes in the work function of the iridium surface. Further changes, which were time and temperature dependent, resulted when such surfaces were heated. Flash filament experiments showed that the changes in work function upon henting are due to desorption reactions and that the desorbed product consists principally of hydrogen. By assuming a linear relationship between surface coverage and work function, it was possible to determine the desorption kinetics from the observed rates of work function change at various temperatures. The ... continued below

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Pages: 22

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Arthur, J. R., Jr. & Hanson, R. S. April 1, 1962.

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Description

The adsorption of ethane, ethylene, and acetylene on clean iridium in a field emission microscope was found to cause characteristic changes in the work function of the iridium surface. Further changes, which were time and temperature dependent, resulted when such surfaces were heated. Flash filament experiments showed that the changes in work function upon henting are due to desorption reactions and that the desorbed product consists principally of hydrogen. By assuming a linear relationship between surface coverage and work function, it was possible to determine the desorption kinetics from the observed rates of work function change at various temperatures. The results were consistent with a mechanism involving stepwise surface dehydrogenation in which a pair of hydrogen atoms is removed from the hydrocarbon molecule in each step, followed by desorption of the adsorbed hydrogen. At very high temperatures the remainlng carbon atoms are removed, presumably by evaporation. (auth)

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Pages: 22

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  • Other Information: Orig. Receipt Date: 31-DEC-63

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  • Report No.: IS-462
  • Grant Number: W-7405-ENG-82
  • DOI: 10.2172/4750463 | External Link
  • Office of Scientific & Technical Information Report Number: 4750463
  • Archival Resource Key: ark:/67531/metadc1035465

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Office of Scientific & Technical Information Technical Reports

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Creation Date

  • April 1, 1962

Added to The UNT Digital Library

  • Oct. 18, 2017, 7:39 a.m.

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  • Dec. 28, 2017, 1:14 a.m.

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Arthur, J. R., Jr. & Hanson, R. S. The Adsorption and Surface Reactions of Hydrocarbons on Clean Iridium, report, April 1, 1962; Murray Hill, New Jersey. (digital.library.unt.edu/ark:/67531/metadc1035465/: accessed December 9, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.