Adsorption and reaction of 1,3-butadiene on Pt(111) and Sn/Pt(111) surface alloys

Haibo Zhao, Bruce E. Koel

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Temperature-programmed desorption (TPD), Auger electron spectroscopy (AES), and low-energy electron diffraction (LEED) were used to study the chemistry of 1,3-butadiene (H2C=CHCH=CH2, C4H6) on Pt(111) and p(2 × 2)-Sn/Pt(111) and (√3 × √3)R30°-Sn/Pt(111) surface alloys. All chemisorbed 1,3-butadiene completely dehydrogenated to H2 and surface carbon on Pt(111). Alloying Sn on Pt(111) can completely inhibit this decomposition and 1,3-butadiene reversibly adsorbs and desorbs from the two Sn/Pt(111) alloys under UHV conditions. The desorption activation energy of 1,3-butadiene on the (2 × 2) and (√3 × √3)R30°-Sn/Pt(111) surface alloys is 88 and 75kJ/mol, respectively. These values are good estimates of the adsorption energies, and also place lower limits on the activation energy barrier for dissociating vinylic C-H bonds on the (2 × 2) and √3 surface alloys. Even though 1,3-butadiene is much more strongly chemisorbed than 1-butene (H2C=CHCH2CH3, C4H 8) on the (2 × 2)-Sn/Pt(111) alloy, 1,3-butadiene is less reactive than 1-butene because there are no allylic β-CH bonds in 1,3-butadiene as there are in 1-butene.

Original languageEnglish (US)
Pages (from-to)261-268
Number of pages8
JournalSurface Science
Volume572
Issue number2-3
DOIs
StatePublished - Nov 20 2004

All Science Journal Classification (ASJC) codes

  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Materials Chemistry

Keywords

  • Alkenes
  • Alloys
  • Auger electron spectroscopy
  • Chemisorption
  • Low energy electron diffraction (LEED)
  • Platinum
  • Thermal desorption
  • Tin

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