TG study on the reaction of γ-Al2O3 by CCl4. Part I. Kinetic model for the chlorination process

I. S. Pap, I. Bertóti, Gy Mink

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Abstract

Thermogravimetric (TG) measurements were carried out to study the chlorination of γ-alumina by gaseous CCl4 in the temperature range 650-1123 K at 102-104 Pa CCl4 partial pressure. Experimental results indicate that the reaction involves two main steps: the substitution of oxygen atoms on the surface by chlorine leading to a mass gain and the volatilization of the main gaseous product, aluminium chloride, with a mass loss of the sample. These processes take place simultaneously during the course of the reaction. A kinetic model is proposed to describe these two steps providing a simple method for linearization of the initial part of the isothermal TG curves. Temperature and partial pressure dependence of the reaction rate and of the steady-state surface coverage are discussed on the basis of the proposed kinetic model. Activation energies and reaction orders are calculated for these two steps.

Original languageEnglish
Pages (from-to)69-81
Number of pages13
JournalThermochimica Acta
Volume79
Issue numberC
DOIs
Publication statusPublished - Sep 1 1984

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ASJC Scopus subject areas

  • Instrumentation
  • Condensed Matter Physics
  • Physical and Theoretical Chemistry

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