Electroreactivity of isopropanol on platinum in acids studied by DEMS and FTIRS
The reactivity of isopropanol on polycrystalline Pt in acid solutions was investigated using in-situ Fourier transform IR spectroscopy (FTIRS) and on-line differential electrochemical mass spectrometry (DEMS). The electro-oxidation products are acetone and CO<sub>2</sub>; the former is o...
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| Autores principales: | , , |
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| Formato: | Articulo |
| Lenguaje: | Inglés |
| Publicado: |
1995
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| Materias: | |
| Acceso en línea: | http://sedici.unlp.edu.ar/handle/10915/85994 |
| Aporte de: |
| Sumario: | The reactivity of isopropanol on polycrystalline Pt in acid solutions was investigated using in-situ Fourier transform IR spectroscopy (FTIRS) and on-line differential electrochemical mass spectrometry (DEMS). The electro-oxidation products are acetone and CO<sub>2</sub>; the former is observed when isopropanol is present in the bulk of the solution, and the latter is produced from strongly adsorbed species. Both bulk and adsorbed isopropanol electro-reduction yield propane. H-D exchange is observed during propane formation when the reaction takes place in a D<sub>2</sub>O + DCIO<sub>4</sub> solution. This observation suggests the formation of adsorbates bonded to the surface through the C ∝ atom of the isopropanol molecule. FTIR spectra of adsorbed species show the presence of -CH<sub>3</sub> and -COH groups. The most probable adsorbate structures are (CH<sub>3</sub>-C-CH<sub>3</sub>)Pt, (CH<sub>3</sub>-CH-CH<sub>3</sub>)Pt and (CH<sub>3</sub>-COH-CH<sub>3</sub>)Pt, presumably accompanied by (CH<sub>3</sub>-CO-CH<sub>3</sub>)Pt. |
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