ADSORPTION OF C-3 ALCOHOLS, 1-BUTANOL, AND ETHENE ON PLATINIZED PLATINUM AS STUDIED WITH FTIRS AND DEMS

The irreversible adsorption of several C-3 alcohols, 1-butanol, and et hene on platinized platinum has been studied with Fourier transform IR spectroscopy (FTIRS) and differential electrochemical mass spectromet ry (DEMS) in perchloric acid electrolyte. Apart from 2-propanol, all s tudied alcohols display C-C(O) dissociative adsorption as the only pat hway active in the formation of irreversible adsorbates. 1,2,3-Propane triol is the only compound that is fully converted to adsorbed CO, whi le all other primary alcohols generate hydrocarbon adspecies in additi on to CO. No further C-C bond breaking is observed in these hydrocarbo n adspecies, which were found to be highly dehydrogenated. The hydroca rbon species can be fractionally hydrogenated off the surface to form corresponding gaseous compounds. 2-Propanol and ethene do not undergo C-C dissociation to form CO but are dehydrogenated considerably. For 2 -propanol and ethene it was found that a small amount of oxygen incorp oration occurs on the C-1 position, followed by decarbonylation to for m CO.