ADSORPTION AND ACTIVATION OF CARBON MONOXIDE ON SULFIDED Co/Mo/γ-Al2O3 METHANATION CATALYSTS

Four different types of Co/Mo/γ-AlOsulfided methanation cata-lysts containing promotors K,P,Mn and Ni respectively prepared by impregna-tion method have been carefully studied by means of in silu IR spectroscopy andXPS（X-ray photoelectron spectroscopy）.Reactant carbon monoxide was tak-en as the probe molecule.From carbon monoxide absorption IR spectra,it wasfound that carbon monoxide adsorption is a reversible chemisorption process atdifferent temperatures.The activation degree of carbon-oxygen bond bychemisorption depends strongly on temperature.Promotors potassium,man-ganese,phosphorus and nickel show an electronic effect on Co/Mo/γ- AlOcatalysts.Their promotion effects are in the order of CoMo-K（15）>CoMo-Mn（5）≈Ni（5）Mo>P（5）-CoMo.Prereduction or preoxidation of the sulfidedcatalysts resulted in loss of the characteristics of carbon monoxide IR band andmethanation activity as well.