Vibrational Spectroscopy Study of CH3COOH, CH3COOD and (13)CD3COOH(D) Adsorption on Pt(111). 1. Surface Dimer Formation and Hydrogen Bonding.

摘要

Acetic acid (CH3COOH,-CH3COOD and 13CD3COOH(D)) adsorption on Pt (111) at 168 K has been studied as a function of surface coverage with HREELS. At low acetic acid dosages dissociative adsorption occurs forming a surface acetate species. Further dissociative adsorption as CO(a)orCH3(a)from acetic acid adsorption is ruled out based on the absence of their characteristic vibrational modes. Molecular adsorption occurs at moderate acetic acid dosages with a fingerprint peak at 932 cm-1 for CH3COOH and 13CD3COOH adsorbates. This mode corresponds to a well documented OH mode of the acetic acid dimer.