Application of Statistical Rate Theory of Interfacial Transport to Study Solid Surface Heterogeneity from Controlled-rate Thermal Desorption |
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| Authors: | Villiéras F. Michot L. J. Gérard G. Cases J. M. Rudzinski W. |
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| Affiliation: | (1) Laboratoire Environnement et Minéralurgie, INPL et UMR 7569 du CNRS, Ecole Nationale Supérieure de Géologie, BP 40, 54 500 Vandoeuvre les Nancy, France;(2) Department of Theoretical Chemistry, Faculty of Chemistry, Maria Curie-Skłodowska University, Pl. Marii Curie-Skłodowskiej 3, Lublin, 20-031, Poland |
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| Abstract: | Controlled-rate thermodesorption (CRTD) spectra are obtained by adjusting the heating rate in such a way that the rate of desorption can be constant. A quantitative analysis of the obtained spectra is presented, based on application of the statistical rate theory of interfacial transport (SRTIT) to describe both adsorption and desorption kinetics. The SRTIT approach relates the rates of adsorption and desorption to the chemical potentials of the adsorbate in the gaseous and in the adsorbed phases. This quantitative analysis of the CRTD spectra yields the condensation approximation for the actual adsorption energy distribution. For the purpose of illustration, an analysis is made of water desorption from a synthetic apatite mineral under CRTD and classical TPD conditions. The influence of the adsorption and desorption rates is also discussed. This revised version was published online in July 2006 with corrections to the Cover Date. |
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| Keywords: | apatite CRTD spectra surface heterogeneity thermal desorption |
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