Characterization of Rh, Mo and Rh-Mo particles formed on TiO2(110) surface: A TDS, AES and RAIRS study

► HT CO-desorption from TiO2 + Rh + COsat corresponds to C+O reaction on the titania support. ► Lack of CO2 suggests that O atoms arising from CO bind to reduced centers of titania. ► Preformed Mo particles increase the dispersion of rhodium deposit. ► Extended CO dissociation on Mo-Rh particles stems mainly from reaction with Mo. ► The Mo2C formed is a possible source of enhanced catalytic activity of Mo-Rh clusters.