Effects of surface defects on adsorption of CO and methyl groups on rutile TiO2(110)

The interaction of reactants with catalysts has always been an important subject for catalytic reactions. As a promising catalyst with versatile applications, titania has been intensively studied for decades. In this work we have investigated the role of bridge bonded oxygen vacancy (O-v) in methyl groups and carbon monoxide (CO) adsorption on rutile TiO2(110) (R-TiO2(110)) with the temperature programmed desorption technique. The results show a clear different tendency of the desorption of methyl groups adsorbed on bridge bonded oxygen (O-b), and CO molecules on the five coordinate Ti4+ sites (Ti-5c) as the O-v concentration changes, suggesting that the surface defects may have crucial influence on the absorption of species on different sites of R-TiO2(110).