UTN- FRC -Producción Académica de Investigación y Desarrollo - Artículos

Permanent URI for this collectionhttp://48.217.138.120/handle/20.500.12272/2453

Browse

Author: search.filters.author.Juárez, Juliana MaríaSubject: search.filters.subject.CMK-1

Search Results

Now showing 1 - 2 of 2
  • Thumbnail Image
    Item
    Preparation and characterization of activated CMK-1 with Zn and Ni species applied in hydrogen storage
    (Wiley Online Library, 2015) Juárez, Juliana María; Gómez Costa, Marcos Bruno; Anunziata, Oscar Alfredo
    The aim of this work is to prepare CMK-1 modified with Zn and Ni in order to improve its capacity in hydrogen stor- age. The approach that we have followed includes synthesis of nanostructures with the experimental study of its ad- sorption capacity and storage properties. We have shown that CMK-1 ordered porous carbon modified with metals is a promising material for hydrogen storage. The incorporation of metals was performed by wetness impregnation. The samples were characterized by X-ray diffraction, Fourier transform infrared spectroscopy, scanning electron micro- scope, transmission electron microscopy, X-ray photoelectron spectroscopy, and Brunauer–Emmett–Teller methods. The CMK 1 modified with Zn showed the highest H2 uptake at 77 K and at low and high pressure (1.5 and 4.4 wt.% at 1 and 10 bar, respectively). The introduction of Ni into CMK-1 does not increase hydrogen storage capacity at low pres- sure. However, at a higher pressure (10 bars), Ni-CMK-1 displays improved results in hydrogen uptake compared with those of CMK-1 pristine, 2.4 and 2.1 wt.%, respectively.. Copyright © 2015 John Wiley & Sons, Ltd.
  • Thumbnail Image
    Item
    Iron-modified mesoporous materials as catalysts for ODS of sulfur compounds
    (2020) Rivoira, Lorena Paola; Juárez, Juliana María; Martínez, María Laura; Beltramone, Andrea Raquel
    Fe-modified mesoporous catalysts were used in the ODS of DBTs using H2O2 as oXidant and acetonitrile as solvent. SBA-15, MCM-48, CMK-3 and CMK-1 were used as supports. Iron was incorporated using iron nitrate by wetness impregnation. The catalysts were characterized by XRD, N2 isotherms, TEM, XPS and ICP. We developed catalysts with high specific surface area, pore volume and narrow mesopore size distribution and highly dis- persed Fe- species. The catalysts were tested in the o Xidative desulfurization of different sulfur compounds as benzothiophene, dibenzothiopene and 4,6-dimethyl dibenzothiopene. The catalyst prepared using CMK-3 as support was the most active for the ODS reaction. The good activity was related with the high dispersion of the iron oXides, mainly in the magnetite phase. Temperature, hydrogen peroXide and sulfur initial concentration were studied using Fe-CMK-3 in the oXidation of DBT. The optimal operation conditions were determined. Fe- CMK-3 is an active and stable catalyst to be applied in the industrial process of ODS.