Selective Adsorption of Organosulfur Compounds From Logistic Fuels by Mixed Oxide Supported Silver Adsorbent

Adsorption of organosulfur compounds from logistic fuels is a viable approach for producing ultra clean fuels for fuel cell application. Silver sorbent supported on titania has superior sulfur adsorption capacity from liquid fuels at ambient conditions. Silver in oxidized and dispersed form removes sulfur from fuel down to ppmw level without requiring any activation stage. This paper discusses the performance of silver supported onto TiO₂-SiO₂ and TiO₂-Al₂O₃ mixed oxide for desulfurizing jet fuel JP5 (1172ppmw sulfur content). Mixed oxide support of TiO₂- SiO₂ and TiO₂- Al₂O₃ provides room for higher loading of oxidized and dispersed Ag incorporation. 12%Ag loaded on TiO₂- Al₂O₃ mixed oxide support had equilibrium saturation capacity of 9.61 mg of S/g sorbent for desulfurizing JP5. Silver dispersion was measured by O₂ chemisorption and its oxidation state was measured by TPR. From analyzing the sorbents, it was observed that Al2O3 and SiO2 provide high surface area support while TiO2 facilitates Ag to disperse onto support surface. 100% of the sulfur capacity of the sorbent against JP5 was retained after multi-cycle regeneration of the sorbent in air at temperatures ranging from 230-450°C.

From analyzing the sorbents, it was observed that Al2O3 and SiO2 provide high surface area support while TiO2 facilitates Ag to disperse onto support surface.

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See more of this Session: Adsorbent Materials
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