Methanol Adsorption and Decomposition on Clean and Oxidized Palladium (111)

摘要

The interaction of methanol with Pd(111) has been studied using high resolution electron energy loss spectroscopy (HREELS). We find both a chemisorbed and a physisorbed phase on the surface at 140K. Desorption of the physisorbed phase occurs by 160K and approximately 90% of the chemisorbed layer desorbs by 300K. Exposure to methanol at 300K causes dissociation of chemisorbed CO. Decomposition of chemisorbed methanol to a methoxy species occurs near 200K in the presence of a preadsorbed p(2x2) oxygen layer whereas no methoxy is detected on the clean surface.