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Adsorption and reaction of 1,3-butadiene on Pt(1 1 1) and Sn/Pt(1 1 1) surface alloys by Haibo Zhao; Bruce E. Koel is a Physics and Astronomy article available to read on EtoBox.

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Temperature-programmed desorption (TPD), Auger electron spectroscopy (AES), and low-energy electron diffraction (LEED) were used to study the chemistry of 1,3-butadiene (H 2 C@CHCH@CH 2 , C 4 H 6 ) on Pt(1 1 1) and p(2 • 2)-Sn/Pt(1 1 1) and ( p 3 • p 3)R30°-Sn/Pt(1 1 1) surface alloys. All chemisorbed 1,3-butadiene completely dehydrogenated to H 2 and surface carbon on Pt(1 1 1). Alloying Sn on Pt(1 1 1) can completely inhibit this decomposition and 1,3-butadiene reversibly adsorbs and desorbs from the two Sn/Pt(1 1 1) alloys under UHV conditions. The desorption activation energy of 1,3-butadiene on the (2 • 2) and ( p 3 • p 3)R30°-Sn/Pt(1 1 1) surface alloys is 88 and 75 kJ/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 p 3 surface alloys. Even though 1,3-butadiene is much more strongly chemisorbed than 1-butene (H 2 C@CHCH 2 CH 3 , C 4 H 8 ) on the (2 • 2)-Sn/Pt(1 1 1) alloy, 1,3-butadiene is less reactive than 1-butene because there are no allylic b-CH bonds in 1,3-butadiene as there are in 1-butene.

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Author

Haibo Zhao; Bruce E. Koel

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0039-6028)

Published

2004

Language

EN

Field

Physics and Astronomy (Physical Sciences)