AVS 51st International Symposium
    Surface Science Monday Sessions
       Session SS-MoP

Paper SS-MoP7
Adsorption and Reaction of Butyl Groups on Pt(111)

Monday, November 15, 2004, 5:00 pm, Room Exhibit Hall B

Session: Poster Session
Presenter: I. Lee, University of California, Riverside
Authors: I. Lee, University of California, Riverside
F. Zaera, University of California, Riverside
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The adsorption and thermal reaction of 1- and 2-butyl moieties on Pt(111) was investigated by using reflection-absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD). The butyl intermediates were prepared via thermal activation of the C-I bond of 1- and 2-iodobutanes, respectively. Buta-1,2-diyl and buta-2,3-diyl were observed after the first dehydrogenation. The subsequent thermal activation of those butyl groups resulted in a competition between reductive elimination to butane and @beta@-hydride elimination to butene. Coadsorption experiments with hydrogen and deuterium were used to characterize hydrogenation and H-D reactions. It was found that the hydrogenation of 1-butyl to butane is enhanced by predosed hydrogen, while 2-butyl favors the dehydrogenation to butene via @beta@-hydride elimination.