Reactions of halogenated hydrocarbons at Pt-group metals—II. on the adsorption rate at Pt and Pd electrodes

✍ Scribed by U. Müller; A. Dülberg; A. Stoyanova; H. Baltruschat

• Publisher: Elsevier Science
• Year: 1997
• Tongue: English
• Weight: 794 KB
• Volume: 42
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/s0013-4686(96)00439-2

✦ Synopsis

DEMS

studies on the adsorption of halogenated methane derivates led to the conclusion that those compounds adsorb as =CH2 or =CH species on Pt and Pd. Apart from those structures on Pt, a CO-like adsorbate which results from addition of water molecules or OH-ions is formed. The adsorbate can partially be desorbed at negative potentials by the formation of methane, ethane and a little butane. At anodic potentials the adsorbate is oxidized to COz. The adsorption rate increases with the number of halogen atoms in the molecule. Moreover, it is dependent on the charge of the electrode or the competitive adsorption OH-anions. The transfer of the electrons during adsorption reaction was found not to be the rate-determining reaction step.