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- W2032606227 abstract "The chemisorption of oxygen on an industrial vanadium pentoxide/potassium sulphate catalyst has been studied in the temperature range 300-353°C by a gravimetric technique. Agreement of equilibrium data with the Langmuir and Freudlich equations is not entirely satisfactory. The kinetic measurements suggest that at least two mechanisms are involved in oxygen chemisorption under certain conditions. At low coverage Langmuir or Elovich kinetics are followed reasonably closely although a pressure dependence is apparent suggesting dissociation into oxygen atoms before a final chemisorbed state is reached. Diffusion is suggested as the possible ratedetermining process at higher coverage. Langmuir analysis of the kinetics as equilibrium is approached shows that an unexpected pressure dependence also exists in this region. On a étudié par voie gravimétrique, à une échelle de températures comprises entre 300 et 353°C, la chemisorption de l'oxygène sur un catalyseur industriel formé de pentoxyde de vanadium et de sulfate de potassium. La concordance entre les résultats d'équilibre et les équations de Langmuir et de Freundlich n'est pas complètement satisfaisante. Les mesures cinétiques semblent indiquer qu'au moins deux mécanismes entrent en jeu dans la chemisorption de l'oxygène dans certaines conditions. Pour un champ d'application faible, la chemisoroption se fait d'une manière assez rapprochée de la cinétique de Langmuir ou d'Elovich, quoiqu'elle indique une dépendance de la pression qui laisse croire qu'il se produit une dissociation en atonies d'oxygène avant que l'état final de la chemisorption ne soit atteint. Il y a lieu de croire que la diffusion détermine la vitesse de la chemisorption dans le cas d'un champ d'application plus considérable. L'analyse de la cinétique indique qu'il existe aussi dans ce secteur une dépendance imprévue de la pression." @default.
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- W2032606227 title "Kinetics and thermodynamics of oxygen chemisorption on an industrial vanadium oxide catalyst" @default.
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- W2032606227 doi "https://doi.org/10.1002/cjce.5450510617" @default.
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