Temperature programmed desorption: experimental aspect

This paper presents a quantitative analysis of the effects of heating rate and pumping speed on the shape of the peak, measuring sensibility, and kinetic desorption parameters for a single peak thermal desorption process. The results presented here show that improper settings for the rate of heating...

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Bibliographic Details
Published in:Surface science 1995-11, Vol.341 (1), p.196-201
Main Authors: García, V.J., Briceño-Valero, J.M., Mora, A.E.
Format: Article
Language:English
Subjects:
Chemistry
Exact sciences and technology
General and physical chemistry
Solid-gas interface
Surface physical chemistry
Thermal desorption
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Summary:This paper presents a quantitative analysis of the effects of heating rate and pumping speed on the shape of the peak, measuring sensibility, and kinetic desorption parameters for a single peak thermal desorption process. The results presented here show that improper settings for the rate of heating (β) and the pumping time (τ) can lead to a bad kinetic model. We have discussed thoroughly the role that these variables play in desorption phenomena, and at the same time suggest a way of optimizing them in order to obtain a good representation of the discussed phenomena for a particular system. It has been demonstrated that a product of the heating rate and pumping time equal to 1 leads to the best quality thermal desorption spectrum.
ISSN:0039-6028
1879-2758
DOI:10.1016/0039-6028(95)00651-6