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

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WANG Da-Xiang ZHANG Ji-Yan ZHANG Liu Chemical Engineering Department
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Al2O3 METHANATION CATALYSTS; ADSORPTION AND ACTIVATION OF CARBON MONOXIDE ON SULFIDED Co/Mo; Ni;
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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.
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页码:19 / 29
页数:11
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