Adsorption and desorption reactions of bicyclic aromatic compounds at polycrystalline and Pt(111) studied by DEMS

摘要: Abstract The adsorption of naphthalene, tetraline and biphenyl at Pt(111), roughened Pt(111) polycrystalline Pt electrodes was studied using differential electrochemical mass spectrometry (DEMS). From the amount CO 2 evolved during oxidation adsorbate layers, coverages were estimated to be around 0.2 nmol cm −2 for all three molecules. However, in case naphthalene tetraline, charges per molecule are somewhat (20–30%) larger than expected theoretically, indicating that does not lead only , but also other, nonvolatile products. Adsorbed can largely desorbed potentials hydrogen region below as itself from completely hydrogenated product bicyclohexyl a Pt(111). Interestingly usual electrode is much less active towards hydrogenation, leading cyclohexylbenzene main desorption product. Less half formed or under same conditions, again surface being least, most complete hydrogenation.