Browsing by Author "Leiva, K."

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    Determination of sunscreen compounds in water samples by silicone rod extraction
    (2013) Giordano Villatoro, Ady; Richter, Pablo; Leiva, K.; Ascar, Loreto
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    Mobility of nonsteroidal Anti-inflammatory drugs in soils with and without amendment of biosolid
    (2017) Ascar. L.; Ahumada, I.; Morales, N.; Garrido, T.; Giordano Villatoro, Ady; Leiva, K.
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    SUPPORT EFFECT ON CONVERSION OF QUINOLINE OVER ReS2 CATALYST
    (2016) Bassi, R.; Villarroel, M.; Gil-Llambias, F. J.; Baeza, P.; Garcia-Fierro, J. L.; Martinez, N.; Olivera, P.; Leiva, K.; Escalona, N.
    The conversion of quinoline over ReS2 supported on gamma-Al2O3, SiO2, ZrO2 and TiO2 catalysts in a batch reactor at 300 degrees C and 5 MPa of hydrogen pressure was studied. The catalysts were prepared by wet impregnation with a loading of 1.5 atoms of Re per nm(2) of support. The catalysts were characterized by N-2 adsorption, X-ray photoelectron spectroscopy (XPS) and X-ray powder diffraction (XRD). The Re(x)/supports catalysts displayed high activities for the conversion of quinoline, although negligible formation of N-free compounds (hydrodenitrogenation) were observed. The intrinsic activities of ReS2 were modified by the support decreased in the order: Re/TiO2 > Re/ZrO2 > Re/SiO2 > Re/g-Al2O3. The highest activity displayed by the Re/TiO2 catalyst was correlated with the Re dispersion and formation of ReS2 species. Meanwhile, the lower conversion of quinoline over the Re/ZrO2, Re/SiO2 and Re/g-Al2O3 catalysts was related to the combined effect of the textural properties of catalysts and the formation of ReS(2-x) species on the supports.