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- W2075831009 abstract "Abstract The thermally induced deactivation of a MoVWMn oxide acrolein oxidation catalyst was carried out under air-nitrogen-water vapor atmospheres at 410 °C. Catalyst activities were determined in separate experiments using acrolein-containing feed. The rate of deactivation was found to exhibit second-order dependence on catalyst activity. The presence of oxygen is necessary for deactivation to take place, and water vapor, even in very low concentrations, markedly accelerates the deactivation. The deactivation at 410 °C can be described by a rate law of the Langmuir-Hinshelwood form: − dϱ dt = [ K o p o 1 + K o p o ][k o + K w k w p w 1 + K w p w ]ϱ 2 where ϱ is the relative catalyst activity, K o and K w are the adsorption equilibrium constants for oxygen and water, respectively, and k o and k w are specific rate constants for the reaction in the absence and in the presence of water, respectively. Estimated values for these constants at 410 °C are K o = 37 atm −1 , K w = 250 atm −1 , k o = 0.13 hr −1 , and k w = 0.50 hr −1 . We conclude that the active site for acrolein oxidation on this catalyst includes an oxygen vacancy. The observed deactivation results from the filling of these vacancies, a process which is facilitated by the presence of surface hydroxyl groups." @default.
- W2075831009 created "2016-06-24" @default.
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- W2075831009 date "1982-08-01" @default.
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- W2075831009 title "Deactivation characteristics of an acrolein oxidation catalyst I. Kinetics of activity loss" @default.
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- W2075831009 doi "https://doi.org/10.1016/0021-9517(82)90268-8" @default.
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