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SummaryThe hydrogenation of PA (C 8 H 6 , 102 amu) on pre-ad-sorbate-covered Cu(111) has been studied by temperature-programmed desorption. Two different pre-adsorbate-cover-ed; C x H y -covered and C-covered Cu(111) surfaces areachieved by annealing of multilayer PA on Cu(111) to 520and 810 K, respectively. We have proved that chemisorbedPA with an acetylene group associates with hydrogen of pre-adsorbed C x H y to form styrene (104 amu), a major hydro-genation product. The styrene desorption is increased onpre-C x H y -covered Cu(111) surface while that is dramaticallydecreased on pre-C-covered surface. No ethylbenzene formson the surface by hydrogenation. Two major PA (102 amu)desorption peaks at 360 K (γ2) and 410 K (γ1) are assignedto chemisorbed vertically aligned PA and flat-lying cross-bridged PA, respectively (J. Phys. Chem. C 2007, 111, 5101).The 102 amu TPD peak at 360 K ( γ2) is increased while thatat 410 K (γ1) is decreased with increasing pre-covered C x H y on Cu (111) surface before dosing PA. However, for pre-C-covered surface, the γ2 peak is clearly not enhanced. Thecross-bridged PA ( γ1) may dominantly associate with hydro-gen of pre-adsorbed C

Hydrogenation of Phenylacetylene to Styrene on Pre-CxHy- and C-Covered Cu(111) Single Crystal Catalysts

Hydrogenation of Phenylacetylene to Styrene on Pre-C_xH_y- and C-Covered Cu(111) Single Crystal Catalysts