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dc.contributorSoriaga, Manuel P.
dc.creatorSanabria-Chinchilla, Jean
dc.date.accessioned2010-01-15T00:14:42Z
dc.date.accessioned2010-01-16T02:07:30Z
dc.date.accessioned2017-04-07T19:56:42Z
dc.date.available2010-01-15T00:14:42Z
dc.date.available2010-01-16T02:07:30Z
dc.date.available2017-04-07T19:56:42Z
dc.date.created2006-08
dc.date.issued2009-06-02
dc.identifier.urihttp://hdl.handle.net/1969.1/ETD-TAMU-1750
dc.description.abstractThe chemisorption and electrochemical hydrogenation of hydroquinone (H2Q) at polycrystalline (pc) Pd, well-ordered Pd(100), and Pd-modified Au(hkl) electrodes were studied using a combination of ultra-high vacuum (UHV) surface spectroscopy, electrochemistry (EC), and electrochemical mass spectrometry (EC-MS). H2Q was found to form a slightly tilted flat-oriented quinone (Q) adlayer, when adsorbed from low concentrations; when chemisorbed from high concentrations, an edgewise-oriented H2Q adlayer was indicated. The hydrogenation of the chemisorbed layer is initiated at potentials before the onset of the hydrogen evolution region. As expected, the kinetics increases as the applied potential is increased, but the hydrogenation pathway appears to be independent of the potential. Hydrogenation in the absence of absorbed hydrogen (sub-surface) was studied at ultra-thin Pd films on Au single-crystal substrates. Hydrogenation and/or potential induced desorption were established, although non-volatile and/or hydrophobic products were detected. In comparison, negative excursions with benzene-coated electrodes resulted in nothing more than potential-induced desorption of the starting material. Negative-potential electro-desorption was more facile at terraces than at steps. Vibrational spectroscopic measurements suggested that hydrogenation occurs one molecule at a time to the fullest extent that resulted in desorption of product; that is, partially hydrogenated species do not exist on the surface.
dc.language.isoen_US
dc.subjectelectrochemical hydrogenation
dc.subjecthydroquinone
dc.subjectbenzoquinone
dc.subjectbenzene
dc.subjectpalladium
dc.subjectHREELS
dc.subjectDEMS
dc.subjectchemisorption
dc.subjectthin films
dc.subjectgold
dc.titleElectrochemical hydrogenation of aromatic compounds chemisorbed at polycrystalline and single-crystal Pd surfaces
dc.typeBook
dc.typeThesis


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