Abstract
In this paper, SBA-15 mesoporous silica based adsorbents were synthesized for the desulfurization of flue gas streams, by several methods (wet impregnation, incipient wetness impregnation and ion exchange). The influence of the drying and calcination conditions on the porous texture and the dispersion of the active phase (CuO), as well as the efficiency of the adsorbents for SOx trapping, were studied. Depending on the synthesis conditions, copper species are present as large CuO particles (1 μm) and/or as homogeneously dispersed species, undetectable by XRD/TEM. The SOx adsorption efficiency seems to be closely related to the undetected copper species. Différents adsorbants ont été synthétisés à partir de silice mésoporeuse SBA-15 pour la désulfuration d’effluents gazeux. Trois méthodes d’imprégnation (voie humide, à sec et échange ionique) ont été testées. L’influence des conditions de séchage et de calcination sur la texture poreuse, la dispersion de la phase active (CuO), ainsi que l’efficacité des matériaux pour la chimisorption des SOx ont été étudiées. En fonction des conditions de synthèse, le cuivre est présent sous forme de grosses (1 μm) particules de CuO et/ou d’espèces uniformément dispersées et non détectées par DRX/MET. L’efficacité des adsorbants semble étroitement liée aux espèces cuivriques non détectées.
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