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- W2027035921 abstract "The activity of a commercial Co-Mo oxide catalyst in the water-gas shift reaction was studied with transient response experiments in a gradientless spinning basket reactor operating at 350-400 °C and at atmospheric pressure. The Co-Mo oxide catalyzed the shift reaction at temperatures above 350°C, whereas the activity was low at 350 ° C. The transient response experiments showed that hydrogen was always formed faster from the surface than carbon dioxide. This principal effect was observed in transients obtained after different catalyst pretreatments with N2, with N2 and H2O as well as with N2, H2O and H2. Pretreatment with H2O enhanced the transient responses of both H2 and CO2. Separate chemisorption studies of H2, CO, and CO2 indicated that CO2 is a more abundant surface species than CO and H2. Based on the transient response experiments and the chemisorption studies a reaction mechanism was proposed, which involves water adsorption and decomposition steps, a reaction step between CO and surface hydroxyls giving H2 and adsorbed CO2, and finally, a CO2 desorption step. The surface reaction and CO2 desorption steps were assumed to be rate determining. The stationary kinetics were described with a rate equation based on the rate determining steps, and the behaviour of the transient responses was explained with the proposed surface reaction mechanism." @default.
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- W2027035921 date "1993-06-01" @default.
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- W2027035921 title "Water-gas shift reaction on a cobalt-molybdenum oxide catalyst" @default.
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- W2027035921 doi "https://doi.org/10.1016/0926-860x(93)80099-c" @default.
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