Adsorption and Dissociation of CO2 on Ru(0001)

The adsorption and dissociation of carbon dioxide on a Ru(0001) single crystal surface was investigated by reflection-absorption infrared spectroscopy (RAIRS) and temperature-programmed desorption (TPD) spectroscopy for CO₂ adsorbed at 85 K. RAIRS spectroscopy shows that the adsorption of CO₂ on a Ru(0001) single crystal is partially dissociative, resulting in CO₂ and CO. The CO vibrational mode was also observed to split into two distinct modes, indicating two general populations of CO present at the surface. Furthermore, a time-dependent blue-shift is observed, which is characteristic of increasing CO surface coverage. TPD showed that coverages of up to 0.3 ML were obtained, and no evidence for chemisorption of oxygen on ruthenium was found.