Characterization of various surface Co-sites on reduced Co-Mo/Al_2O_3 and Ru-Co-Mo/Al_2O_3 catalysts using IR and MS spectroscopies

An investigation on adsorption of NO on reduced Co-Mo/Al_2O_3 and Ru-Co-Mo/Al_2O_3catalysts has been performed using FT-IR and MS spectroscopies. IR spectra of NO adsorptionshowed two bands at 1895 and 1800 cm_(-1), and NO--TPD profiles gave rise to several peaks at 353, 423and 473 K, which are assigned to various Co-sites on the surface. Compared with Co-Mo/Al_2O_3,the adsorption rate, binding energy, and amount of NO adsorbed on Ru-Co-Mo/Al_2O_3 are veryhigh.