Analysis of Thermal Desorption Curves for Heterogeneous Surfaces. I. A Linear Variation of the Activation Energy of Desorption

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Abstract
This paper deals with the analysis of the desorption curves for heterogeneous surfaces, where the activation energy of desorption, Ed, linearly depends on surface coverage, θ, i.e., Ed=Ed0+α(1−θ) Computer simulation resulted in a characteristic change of curve shapes corresponding to the variation of desorption rate parameters, Ed0, A and α. By means of empirical parameters characterizing the peak shapes such as peak temperature, half width and symmetry factor, we were able to obtain a set convenient and valid equations for estimating the rate parameters. The curve fitting method was also investigated and found to be more precise, the equations obtained being very useful for giving an initial set of values for this method. The two methods were applied to the thermal desorption curves of CO2 on TiO2, and found to be useful and reliable.

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