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• W2037321856 endingPage "3360" @default.
• W2037321856 startingPage "3355" @default.
• W2037321856 abstract "The influence of hydrogen coadsorption on hydrocarbon chemistry on transition metal surfaces is a key aspect to an improved understanding of catalytic selective hydrogenation. We have investigated the effects of H preadsorption on adsorption and reaction of 1,3-butadiene (H 2 C CHCH CH 2 , C 4 H 6 ) on Pt(1 1 1) surfaces by using temperature-programmed desorption (TPD) and Auger electron spectroscopy (AES). Preadsorbed hydrogen adatoms decrease the amount of 1,3-butadiene chemisorbed on the surface and chemisorption is completely blocked by the hydrogen monolayer (saturation) coverage ( θ H = 0.92 ML). No hydrogenation products of reactions between coadsorbed H adatoms and 1,3-butadiene were observed to desorb in TPD experiments over the range of θ H investigated ( θ H = 0.6–0.9 ML). This is in strong contrast to the copious evolution of ethane (CH 3 CH 3 , C 2 H 6 ) from coadsorbed hydrogen and ethylene (CH 2 CH 2 , C 2 H 4 ) on Pt(1 1 1). Hydrogen adatoms effectively (in a 1:1 stoichiometry) remove sites from interaction with chemisorbed 1,3-butadiene, but do not affect adjacent sites. The adsorption energy of coadsorbed 1,3-butadiene is not affected by the presence of hydrogen on Pt(1 1 1). The chemisorbed 1,3-butadiene on hydrogen preadsorbed Pt(1 1 1) completely dehydrogenates to H 2 and surface carbon upon heating without any molecular desorption detected, which is identical to that observed on clean Pt(1 1 1). In addition to revealing aspects of site blocking that should have broad implications for hydrogen coadsorption with hydrocarbon molecules on transition metal surfaces in general, these results also provide additional basic information on the surface science of selective catalytic hydrogenation of butadiene in butadiene–butene mixtures." @default.
• W2037321856 created "2016-06-24" @default.
• W2037321856 creator A5014916492 @default.
• W2037321856 creator A5083295872 @default.
• W2037321856 creator A5086612721 @default.
• W2037321856 date "2009-12-01" @default.
• W2037321856 modified "2023-09-25" @default.
• W2037321856 title "Site-blocking effects of preadsorbed H on Pt(111) probed by 1,3-butadiene adsorption and reaction" @default.
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• W2037321856 doi "https://doi.org/10.1016/j.susc.2009.09.024" @default.
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