Browsing by Autor "Gabriel Camargo"

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Design of an adsorbent employing activated carbon fiber to remove lead
(São Paulo State University, 2007) C. Cárdenas-López; Gabriel Camargo; Liliana Giraldo; Juan Carlos Moreno‐Piraján
Zorflex® activated carbon fibers (ACF), reference FM100 198B, are used beforeand after an oxidizing procedure with H 3 PO 4 to study the adsorption of Pb 2+ . The point ofzero charge was determined for the modified and unmodified fiber giving values of 2.3 and4.3, respectively. After oxidizing the ACF, the fiber showed to have a greater Pb 2+ adsorptioncapacity in comparison with the unmodified fiber, which is related with the acid sites increase,where lead was mainly adsorbed. Determination of the BET area was carried out by nitrogenphysisorption at 77K. ACFs presented superficial areas between 1000 and 1500 m 2 /g showingmostly, a microporous structure. The preliminary design of an adsorbent using the modifiedfiber is presented where the fiber superior physicochemical properties over the unmodifiedone are observed.
Determinación del efecto de la preparación y distribución de paladio soportado en Gamma Alúmina en una reacción de oxidación parcial de un alcohol
(Universidad Internacional de La Rioja, 2009) Diana C. Botía; Gabriel Camargo; Juan Carlos Moreno‐Piraján
This work analyzes the effect of the time of impregnatingand previous state of the support in the distribution ofPd/ -Al O prepared by impregnation method varying 2 3time between 1 and 5 hours and considering twoprevious states (wet and dry). The characterization of thesupport and the catalysts and after using them in a PBRfor the partial oxidation of the Isopropanol to atemperature of 180°C and two time factors W/F (15 y 8 AOgcat/mol/h) was made by means of techniques like X-RayDiffraction (XRD), superficial area by BET method,Scanning Electron Microscopy (SEM), among others. Theproducts of the reaction were quantified by means of GasChromatography. Uniform and Egg shell distributionswere obtained, uniform catalysts activated by reductionand calcination were used.
Zeolite Production from Fly Ashes of the Martín Corral Thermoelectric
(Wiley, 2014) Elizabeth D. Isaacs; Gabriel Camargo; Liliana Giraldo; Juan Carlos Moreno‐Piraján
Fly ashes are the mineral residues derived from coal combustion in thermoelectric plants. They are composed of a silica and aluminum reactive matrix that turns the ashes into raw material to elaborate zeolites. Zeolite synthesis is carried out in alkaline media where the structure of the fly ash compounds is reorganized based on the hydrothermal conditions (temperature pressure, pH, time) to spark the growth of crystals whose final product is the zeolitic material. In this study, the production of type A zeolites from fly ashes is explored. This raw material was characterized by doing XRD, TGA and BET tests on the surface area; similarly, the effect of washing on the fly ash properties was evaluated; once this stage was finished, a simple experimental setup for zeolite synthesis was used to establish the minimum temperature (90°), pH (10) and reaction time (<3 HOURS). Finally, the obtained material was subject to XRD and textural analysis.