Biviana Llano

Producción de Diésel Renovable a partir de Aceite de Higuerilla mediante Catalizadores de Níquel-Molibdeno Soportados sobre Alúmina

espanolSe sintetizaron dos catalizadores tipo Ni-Mo soportados sobre y-Al2O3, con diferentes contenidos masicos de los metales activos, y su actividad catalitica en el proceso de desoxigenacion de aceite de higuerilla fue evaluada y comparada con el desempeno obtenido con un catalizador comercial. Previo a las reacciones de desoxigenacion, los catalizadores fueron reducidos y sulfurados con H2S producido in-situ. Los catalizadores fueron caracterizados mediante DRX, adsorcion-desorcion de N2 a 77 K, XRF y TPR. Las pruebas cataliticas fueron llevadas a cabo en un reactor de alta presion (Parr, 500 mL), operando en modo semi-batch. El mayor rendimiento masico hacia diesel renovable (C9-C24) fue del 82.9% y se obtuvo con el catalizador sintetizado que contiene 4.5% NiO y 20% MoO3, evaluado a 350°C, 90 bares y una concentracion del 10%. Ademas, este catalizador, bajo estas condiciones, presento una conversion del 100% y las selectividades mas altas hacia C17 (54.4%) y C18 (20.9%), asi como una menor selectividad a craqueados (0.83%). EnglishCatalysts of Ni-Mo type with different content of active species (Ni,Mo) were synthesized and supported over y-alumina and their catalytic activity in the deoxygenation process of castor oil was evaluated and compared with that obtained with a commercial catalyst. Prior to deoxygenation reactions, the catalysts were reduced and sulfurated with H2S produced in-situ. The catalysts were characterized by XRD, N2 adsorption-desorption at 77K, XRF and TPR. The catalytic tests were carried out in a high-pressure reactor (Parr, 500 mL), operating in semi-batch mode. It was found that the highest mass yield to renewable diesel (C9-C24) was 82.9%, obtained with the synthesized catalyst containing 4.5% NiO and 20% MoO3 operating at 350 °C, 90 bars and 10% catalyst concentration. Besides, this catalysts exhibited 100% conversion and the highest selectivities to C17 (54.4%) and C18 (20.9%), as well as the lowest selectivity to cracked products (0.83%).

Tratamiento Fisicoquímico de las Aguas Residuales Generadas en el Proceso de Beneficio de Arcillas y Alternativas de Uso de los Lodos Generados en el Proceso

The physical-chemical treatment of wastewater from a local industry of benefit of clays by means of jar test for the removal of total suspended solids (TSS) and turbidity has been studied and analyzed. Also, the characterization of the raw material and the residual sludge used in the benefit process was done. The coagulants used were aluminum sulfate and an anionic polymer (A-100). Two pH levels (6 and 9) and two doses of coagulant (20 mg/L and 100 mg/L) were evaluated. The results showed that with a low coagulant concentration it is possible to obtain a high removal, close to 100%, of TSS and turbidity. The anionic polymer showed to be highly effective at concentration of 20 mg/L and pH=6. According to the results, several applications, where the sludge can be reused, were proposed.

Desarrollo de sistemas fotoactivos TIO2/fibra óptica

TiO2 films supported on optical fibers were obtained by two different methods: sol-gel combined with dip-coating and an alternative method from TiO2 P-25 aqueous suspensions. The fibers obtained were characterized by DRX, FTIR, BET, SEM and EDS. Results showed that with the sol-gel method uniform, stable and well supported films can be obtained. The coated fibers prepared from the TiO2 aqueous suspensions showed fractures and poor uniformity, as a result of the coating method. It should be expected that the characteristics of the obtained films induce photoactive properties in this kind of materials.