Experimental study on the separability of reaction-deactivation kinetics: Thermal desorption of alcohols from fresh and Na-poisoned γ–Al2O3

Authors

  • Pio Forzatti,

    Corresponding author
    1. Dipartimento di Chimica Industriale ed Ingegneria Chimica del, Politecnico Piazza Leonardo da Vinci, 32 I-20133 Milan, Italy
    • Dipartimento di Chimica Industriale ed Ingegneria Chimica del, Politecnico Piazza Leonardo da Vinci, 32 I-20133 Milan, Italy
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  • Massimo Borghesi,

    1. Dipartimento di Chimica Industriale ed Ingegneria Chimica del, Politecnico Piazza Leonardo da Vinci, 32 I-20133 Milan, Italy
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  • Italo Pasquon,

    1. Dipartimento di Chimica Industriale ed Ingegneria Chimica del, Politecnico Piazza Leonardo da Vinci, 32 I-20133 Milan, Italy
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  • Enrico Tronconi

    1. Dipartimento di Chimica Industriale ed Ingegneria Chimica del, Politecnico Piazza Leonardo da Vinci, 32 I-20133 Milan, Italy
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Abstract

Temperature programmed desorption (TPD) of methanol and ethanol from fresh and Na-poisoned γ–Al2O3 has been employed to investigate experimentally the separability of reaction-deactivation kinetics. The analysis of the TPD spectra has provided both an energetic characterization of the nonhomogeneous catalytic surface and the kinetic parameters of the desorption reaction, and has allowed quantitative discussion of the separability of the expression for the rate of desorption. The results obtained have been related to the chemical causes of nonseparability of reaction-deactivation kinetics; they also demonstrate the influence of catalyst decay on selectivity. For the systems considered, it appears that the assumption of separable deactivation kinetics is generally not a satisfactory approximation.

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