FT-IR spectroscopy is employed to investigate the methane dissociation and methane partial oxidation over the Rh/SiO 2 catalyst. When CH 4 is adsorbed onto the catalyst surface, it dissociates into adsorbed CH x (x=1～3) and atomic hydrogen on Rh surface. Atomic hydrogen can diffuse from Rh surface to SiO 2 surface where a proton exchange reaction of H with the surface Si-OH occurs, or it reacts with the lattice oxygen of SiO 2 to form new Si-OH.
The catalytic activity of the industrial catalyst A 110 3 after modification with Mn 2+ was found to be increased to about 17.4%. The ammonia synthesis was carried out under conditions of 2 1 MPa, 14400 h -1 and 300 ℃. The increase in activity is explained in terms of the weakness of Fe NN or Fe—N bond based on the XPS and TPD MS results.
