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Catalysis Letters

, Volume 60, Issue 1–2, pp 1–9 | Cite as

Ethylene adsorption on Pt/Au/SiO2 catalysts

  • Jianyi Shen
  • Josephine M. Hill
  • Ramchandra M. Watwe
  • S.G. Podkolzin
  • J.A. Dumesic
Article

Abstract

Ethylene adsorption on a Pt/Au/SiO2 catalyst (2 wt% Pt; Au/Pt atomic ratio of 10) was studied using adsorption microcalorimetry and FTIR spectroscopy. Ethylene adsorption at 300 K on Pt/Au/SiO2 produced π‐bonded, di‐σ‐bonded, and ethylidyne species with an initial heat of 140 kJ/mol, compared to a heat of 157 kJ/mol for Pt/SiO2 on which only ethylidyne species formed. At 203 and 263 K, ethylene adsorbed on Pt as well as on Au surface atoms for the Pt/Au/SiO2 catalyst. Quantum chemical, DFT calculations indicate that Au exerts a significantly smaller electronic effect on Pt than does addition of Sn to Pt.

microcalorimetry IR platinum gold ethylene CO adsorption quantum chemical calculations DFT 

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Copyright information

© Kluwer Academic Publishers 1999

Authors and Affiliations

  • Jianyi Shen
    • 1
    • 2
  • Josephine M. Hill
    • 1
  • Ramchandra M. Watwe
    • 1
  • S.G. Podkolzin
    • 1
  • J.A. Dumesic
    • 1
  1. 1.Department of Chemical EngineeringUniversity of Wisconsin‐MadisonMadisonUSA
  2. 2.Department of ChemistryNanjing UniversityNanjingChina

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