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Calorimetric Study of the Adsorption of Air Pollutants On Alumina-Supported Tin and Gallium Oxides

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The differential enthalpies of adsorption of air pollutants such as S02, N02, NO on alumina-supported tin and gallium oxides were measured by calorimetry coupled with isothermal volumetry. Whatever the amount of tin or gallium on alumina, the enthalpies of adsorption of S02 at low coverage were Of the same order of magnitude or up to 50 kJ/mol lower than those of the support. The amount of SO2 adsorbed decreased with increasing SnO2 loading and increased with increasing Ga2O3 loading on the alumina. The differential enthalpies of adsorption of NO2 are close to those on the support whatever the amount of tin or gallium (around 120-130 kJ/mol). NO is only reversibly adsorbed on the samples. The calorimetric data of ammonia adsorption are given for comparison.

Affiliations: 1: Institut de Recherches sur la Catalyse, CNRS, 2 avenue Einstein, 69626 Villeurbanne Cedex, France


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