Portal de Periódicos da CAPES

Adsorption and deprotonation of CH3COOH on Cu{110}

1986; Elsevier BV; Volume: 39; Linguagem: Inglês

10.1016/0368-2048(86)85053-8

1873-2526

M. Surman, Damian Lackey, David King,

Advanced Chemical Physics Studies

The adsorption of acetic acid on Cu{110} has been studied by high resolution electron energy loss Spectroscopy. At low coverages, adsorption onto the clean surface at 195 K leads to some dissociation to acetate species - but at higher coverages undissociated adsorbed molecules form the predominant species in the adlayer. Warming the acid-saturated surface to 270 K results in an initial rapid deprotonation, but the dissociation reaction quickly terminates before completion. The remaining acetic acid requires higher temperatures to convert to acetate. These observations imply a strongly coverage dependent activation energy for deprotonation. The acetate species remains on the surface at temperatures up to 540 K, at which temperature it decomposes. No sufficiently long-lived intermediates in the decomposition could be detected. Coadsorbed oxygen leads to efficient deprotonation even at 180 K.