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

Title
Hydrogenation of Phenylacetylene to Styrene on Pre-CxHy- and C-Covered Cu(111) Single Crystal Catalysts
Author(s)
손영구웨이 웨이[웨이 웨이]죤 마이크 화이트[죤 마이크 화이트]
Keywords
ACETYLENE; ADSORPTION; CHEMISTRY; PALLADIUM; SURFACE; PT(111); DEHYDROGENATION; ETHYLBENZENE; SELECTIVITY; BENZENE
Issue Date
201105
Publisher
KOREAN CHEMICAL SOC
Citation
BULLETIN OF THE KOREAN CHEMICAL SOCIETY, v.32, no.5, pp.1559 - 1563
Abstract
Thermal hydrogenation of phenylacetylene (PA, C8H6) to styrene (C8H8) on pre-CxHy- and C-covered Cu(111) single crystal substrates has been studied using temperature-programmed desorption (TPD) mass spectrometry. Chemisorbed PA with an acetylene group has been proved to be associated with hydrogen of pre-adsorbed C,fly to form styrene (104 amu) on Cu surface. For the parent (PA) mass (102 amu) TPD profile, the TPD peaks at 360 K and 410 K are assigned to chemisorbed vertically aligned PA and flat-lying cross-bridged PA, respectively (J. Phys. Chem. C 2007, 111, 5101). The relative I-360K/I-410K TPD ratio dramatically increases with increasing pre-adsorbed CxHy before dosing PA, while the ratio does not increase for pre-C-covered surface. For PA on pre-CxHy-covered Cu(111) surface, styrene desorption is enhanced relative to the parent PA desorption, while styrene formation is dramatically quenched on pre-C-covered (lack of adsorbed hydrogen nearby) surface. It appears that only cross-bridged PA associates with adsorbed hydrogen to form styrene that promptly desorbs at 410 K, while vertically aligned PA is less likely to participate in forming styrene.
URI
http://hdl.handle.net/YU.REPOSITORY/25268http://dx.doi.org/10.5012/bkcs.2011.32.5.1559
ISSN
0253-2964
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이과대학 > 화학생화학부 > Articles
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