An intermittent temperature-programmed desorption method for studying kinetics of desorption from heterogeneous surfaces
| Autor: | François Gaillard, M. Abdat, Alain Perrard, J.P. Joly |
|---|---|
| Přispěvatelé: | Institut de recherches sur la catalyse (IRC), Centre National de la Recherche Scientifique (CNRS), IRCELYON, ProductionsScientifiques |
| Jazyk: | angličtina |
| Rok vydání: | 2004 |
| Předmět: |
Thermal desorption spectroscopy
Kinetics Oxide Analytical chemistry [CHIM.CATA] Chemical Sciences/Catalysis General Physics and Astronomy 02 engineering and technology Surfaces and Interfaces General Chemistry Activation energy [CHIM.CATA]Chemical Sciences/Catalysis 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Molecular sieve 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films chemistry.chemical_compound chemistry Desorption 0210 nano-technology Zeolite Analytical thermal desorption |
| Zdroj: | Applied Surface Science Applied Surface Science, Elsevier, 2004, 238, pp.91-96 |
| ISSN: | 0169-4332 |
| Popis: | Reported results show the interest of an intermittent temperature-programmed desorption (ITPD) technique for gaining information on thermodynamics and desorption kinetics of small molecules from the surface of dispersed solids. This technique is a differential form of TPD where a saw-tooth heating program is used to generate a sequence of interrupted desorptions. Two examples are described and discussed in terms of heat of desorption, activation energy of desorption and frequency factors. We first considered ammonia desorption from two different zeolites, that is H-ZSM5 and H-Ω, in order to get information on their surface acidity. Secondly, oxygen desorption from SnO 2 was investigated in order to get quantitative data on O 2 /SnO 2 interaction, this oxide being used in sensors of reducing gases in the atmosphere. |
| Databáze: | OpenAIRE |
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