POROUS HIERARCHICAL STRUCTURES OF TiO2 AND SBA-15 FOR REMOTION OF NOx and SOx PRECURSORS FROM FCC GASOLINE

Keywords:
NOx/SOx precursors; NOx Precursors adsorption; Hybrid TiO2 nanotubes, Hybrid metal SBA-15

Abstract:
A comparison study was made for the adsorptive properties of nanostructured TiO2 and the SBA-15 siliceous materials, which have been prepared and modified to obtain more useful materials, with the aim of using them as adsorbents for removing NOx and SOx precursors from FCC gasoline. Various metallic species were grafted during synthesis, thus producing two series, i.e., M-TiO2 and M-SBA-15 (M: Fe,Ag,Cu) with distinct metal contents(0- 5 %). The structural features were characterized by XRD and HRTEM methods, which confirmed the ordered pore structure of M-SBA-15 for all the metal concentrations and the crystalline structure, i.e., anatase-like scrolls, for the M-TiO2 materials. The pore sizes span in the range 8 - 10 nm for both series. The adsorption properties of both materials series for organonitrogen and organosulfur compounds from a FCC gasoline indicated a high adsorption capacity. The Fe-SBA-15 materials display an increasing adsorption capacity which is proportional to the Fe contents, especially for organonitrogen compounds, while this behavior is reversed for organosulfur species. The M-TiO2 show a more linear behavior with respect to the adsorption of organonitrigen compounds.

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Nanotech 2007 Conference Program Abstract