Abstract— Anatase TiO2 nanoparticles and TiO2 nanotubes were used as adsorbents to determine their selective adsorption properties on liquid-phase pure S- or N-organic compounds (dibenzothiophene (DBT), 4,6- dimethyl DBT (4,6-DMDBT), pyrrole and quinoline), representatives of those contained in Diesel fuels. As well, model Diesel blends, added with these compounds, and were tested in order to emulate a real Diesel composition. Adsorption isotherms were determined at room temperature in the case of the pure compounds and were fitted to either Langmuir or Tempkin models. In all cases, TiO2 nanotubes showed a higher adsorption performance, either at breakthrough or saturation capacity. For instance, at breakthrough adsorption, TiO2 nanotubes adsorbed 230 and 41 times more DBT and 4,6-DMDBT, respectively, than those in TiO2 nanoparticles. As well, at breakthrough point, TiO2 nanotubes adsorbed 22 and 7.8 times more pyrrole and quinoline, respectively, than those in TiO2 nanoparticles. Saturation adsorption capacity of TiO2 nanotubes is 1.7-1.8 times higher for S-compounds and, 1.4-1.9 times higher for N-compounds than that of TiO2 nanoparticles. In a model Diesel blend, selectively N-compounds were lowered considerably, 50 and 81% for quinoline and pyrrole, respectively, while S-compounds remained almost unchanged. These results confirm that TiO2 nanotubes have a strong preference for N-compounds when exposed to Diesel blends having competing S-compounds.
Keywords— Adsorption of organo-nitrogen, organo-sulphur, Sulphur, Titania Nanotube, adsorption properties, Liquid-phase.
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