The activity of Rh supported on the ceria doped titania was investigated by FTIR technique using CO and NO adsorption. The addition of ceria does not lead to new adsorbed species: however the difficult reduction at 500 K of chloride ions of impregnated Rh salt and the persistence of Rh 1 + sites until 773 K are the fingerprints of the effects of ceria addition which favours the rhodium dispersion. At 773 K the reduced catalyst becomes conductive and loss its IR transparency, that is recovered at RT by adsorption of O 2 and NO: the latter is easily dissociated already at RT and reacts with CO producing a full conversion to N 2 and CO 2 at 473 K. In absence of oxygen, propane is partially oxidised at 573 K to CO and CO 2 species, whereas NO is reduced to N 2 and NH x surface groups.