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Four different types of Co/Mo/γ-Al_2O_3 sulfided 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- Al_2O_3catalysts.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.
Four different types of Co / Mo / γ-Al_2O_3 sulfided 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 and XPS (X-ray photoelectron spectroscopy ). Reactant carbon monoxide was tak-en as the probe molecule. Carbon monoxide absorption IR spectra, it was found that carbon monoxide adsorption is a reversible chemisorption process at different temperatures. The activation degree of carbon-oxygen bonds bychemisorption depends strongly on temperature. Promtors potassium, man-ganese, phosphorus and nickel show an electronic effect on Co / Mo / γ-Al 2 O 3 catalysts. Their promotion effects are in the order of CoMo-K (15)> CoMo- P (5) -CoMo.Prereduction or preoxidation of the sulfidedcatalysts resulted in loss of the characteristics of carbon monoxide IR band andmethanation activity as well.