Desarrollo, Producción e Innovación en la Investigación científica

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Author: search.filters.author.Ledesma, BrendaSubject: search.filters.subject.SBA-16

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    Sulfur elimination by ODSwith titanium-modified SBA-16.
    (Univesidsad Tecnológica Nacional., 2015) Rivoira , Lorena Paola; Vallés , Verónica Alejandra; Ledesma, Brenda Cecilia; Martínez , María Laura; Anunziata , Oscar Alfredo; Beltramone , Andrea Raquel; Anunziata , Oscar Alfredo; Martínez , María Laura; Ledesma, Brenda; Vallés , Verónica Alejandra
    Nanostructured carbon CMK-3 and mesoporous silica SBA-15 modified with Fe by using different sources of Fe, were used in the oxidative desulfurization (ODS) of dibenzothiophene (DBT) as a model sulfur compound. Fe-CMK-3 and Fe-SBA-15 were prepared by wetness impregnation using FeCl3.6H2O and FeNO3.9H2O as different sources of Fe. A solution of FeCl3.6H2O/ FeNO3.9H2O in ethanol was mixed with the corresponding material solution (CMK-3 or SBA-15) at room temperature. The solution was placed in a rotary evaporator to remove excess of ethanol at about 333 K and 60 rpm. Afterwards, the sample was dried at 373 K for 18 h and was thermally treated in a dynamic inert (N2) atmosphere. The percentage of Fe has been 2 wt.% with respect to carbon in the final FeCl3-CMK-3 and FeNO3-CMK-3 material. Four samples modified with Fe have been prepared and were characterized by XRD, FTIR, XPS, BET, TEM and SEM. These studies indicated that it was possible to obtain a CMK-3 replica successfully from SBA-15, using sucrose as a carbon precursor. Wide angle XRD pattern of the sample modified with FeCl3.6H2O implies the formation of the magnetite phase in the silica channels. The nanomaterial area is significantly smaller with the incorporation of the metal, SBA-15 and CMK-3`s characteristic structure is maintained after the metal is within the host, in agreement with the XRD studies. The catalytic activity was improved when the nanoporous materials were modified with Fe. The nanoporous carbon modified with FeCl3.6H2O was the most active catalyst for ODS of DBT, using hydrogen peroxide (H2O2) as oxidant and acetonitrile as solvent. 100% of DBT elimination was attained at a short time in mild conditions.
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    Hidrogenación de tetralin utilizando Ir/Ti02/SBA-16.
    (Univesidsad Tecnológica Nacional, 2012) Valles , Verónica; Ponte , María; Ledesma, Brenda; Anunziata, Oscar; Beltramone, Andrea
    Factores tales como, el efecto del soporte y la dispersión del metal, han sido estudiados en conexión con el proceso de HDT (hidrotratamiento catalítico) [1-2] y los resultados obtenidos sugieren que el Ir podría ser una especie catalítica activa para la transformación de aromáticos a compuestos saturados y eficiente para eliminar azufre y nitrógeno, como sitio activo o como promotor de los catalizadores convencionales. Por lo tanto el principal objetivo de este trabajo, que es desarrollar un catalizador en base a Ir/ soporte mesoporoso, modificado con TiO2 activo para la hidrogenación de tetralín y resistente a compuestos con azufre, en condiciones de reacción menos severas que las industriales utilizando un reactor batch. En este trabajo se estudió la actividad catalítica de Ir/TiO2/SBA-16 modificado con 1 % de Ir, en la hidrogenación de tetralin a decalin en presencia de 100 ppm de S como dibenzotiofeno, en un reactor Parr a 250°C y 15 atm.
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    Hydrogenation of tetralin over Ir-TI02/SBA-16
    (Universidad Tecnológica Nacional, 2013) Ledesma, Brenda; Valles , Verónica; Martínez , Maria Laura; Anunziata, Oscar Alfredo; Beltramone , Andrea Raquel
    A titanium modified catalyst based on noble metal has been prepared with the main aim of obtaining thiotolerant catalysts to be used in second stage processes of mild-hydrotreating. We study the catalytic properties of 1 wt% Ir-containing mesoporous materials modified with TiO2 in the hydrogenation of tetralin to decalin in the presence of 100 ppm of dibenzotiophene at 250°C and 15 atm of pressure of hydrogen, using a Parr reactor. Titanium oxide was added via post synthesis with the purpose of improve iridium dispersion. Ir/mesoporous materials were prepared by wetness impregnation. The catalyst synthesized by us had good activity measured in tetralin hydrogenation at mild conditions. The preliminary results show these materials as a promising catalyts for HDS/HDN reactions.