Transient and resonant behavior for no reduction by CO over a Pt/Al2O3 catalyst during forced composition cycling

Authors

  • Ramakant R. Sadhankar,

    1. Department of Chemical Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada
    Current affiliation:
    1. Atomic Energy of Canada Ltd., Chemical Engineering Branch, Chalk River Laboratories, Chalk River, ON, Canada KOJ 1J0
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  • David T. Lynch

    Corresponding author
    1. Department of Chemical Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada
    • Department of Chemical Engineering, University of Alberta, Edmonton, AB T6G 2G6, Canada
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Abstract

The reduction of NO by CO over a Pt/Al2O3 catalyst has been investigated using the technique of forced concentration cycling in an isothermal recycle reactor at 485 K. Time-average conversions exhibit resonant behavior with increasing frequency. Maximum time-average NO conversion of 78%, compared with the steady-state conversion of 3.8%, was attained during out-of-phase feed concentration cycling. The effect of the phase angle between the NO and CO feed cycles has been examined. Higher conversions are obtained by decreasing the NO phase lead below 180°. The convergence to cycle-invariance was slow for high frequency cycling.

Abstract

On a étudié la réduction du NO par le CO sur un catalyseur Pt/Al2O3 à l'aide d'une technique de cyclage forcé de la concentration dans un réacteur de recyclage isotherme à 485 K. Les conversions moyennes dans le temps montrent un comportement de résonance avec l'augmentation de la fréquence. Lors du recyclage de la concentration d'alimentation en opposition de phase, on a obtenu une conversion maximale du NO moyennée dans le temps de 78%, comparativement à une conversion de 3,8% en régime permanent. L'effet de l'angle de phase entre les cycles d'alimentation du NO et du CO a été étudié. On peut améliorer les conversions en diminuant l'avance de phase du NO en-dessous de 180°. La convergence vers l'invariance de cycle est lente pour le cyclage à haute fréquence.

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