Study of adsorption and decomposition of acetic acid on Rh(100) by HREELS and TDS

The adsorption and decomposition of acetic acid on Rh(100) surface have bee n studied using high-resolution electron energy loss spectroscopy (HREELS) and thermal desorption spectroscopy (TDS). Acetic acid of high exposure for med multilayer on the Rh(100) surface. While the temperature was increased to 290 K, the multilayer acetic acid desorbed and the remainder became a su rface O-bonded acetate species and H adatoms. through the G-H bond cleavage . Between 290 K and 400 K, the acetate species underwent two competing reac tions: formation of CO2 and adsorbed CHx and H via C-C and C-H bond cleavag e, and formation of adsorbed CO, CHx O and H via C-C, C-O and C-H bond clea vage. While heated to 500 K, the adsorbed surface remainders were CO, CHx a nd O adatoms. After heated to 600 K, the adsorbed surface CHx decomposed co mpletely, and the adsorbed surface carbon species recombined with oxygen ad atoms to be desorbed as molecular carbon monoxide.