Abstract
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 CO2; 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. HD exchange is observed during propane formation when the reaction takes place in a D2O + DClO4 solution. This observation suggests the formation of adsorbates bonded to the surface through the Cα atom of the isopropanol molecule. FTIR spectra of adsorbed species show the presence of CH3 and COH groups. The most probable adsorbate structures are (CH3CCH3)Pt, (CH3CHCH3)Pt and (CH3COHCH3)Pt, presumably accompanied by (CH3COCH3)Pt.
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