Ingeniero Químico

Evaluación de catalizadores Sn-MCM-41 en la producción de nopol

In this contribution the activity of Sn-MCM-41 materials obtained by hydrothermal synthesis and by chemical vapor deposition (CVD) of Sn on MCM41 with several tin precursors is shown. Sn loading and hexagonal channel ordering were obtained by atomic absorption and X ray diffraction, respectively. High activity for nopol was considerable over those materials containing Sn loadings as low as 0.08%

ESTERIFICACIÓN DE LOS ÁCIDOS GRASOS LIBRES (FFA) DEL ACEITE CRUDO DE PALMA. CALENTAMIENTO CONVENCIONAL VS MICROONDAS

In contrast with conventional heating on the esterification reaction of the crude palm oil free fatty acids (FFA), the main effects of the microwave radiation are described. This reaction being carried out to decrease the palm oil acidity value from 13 to 1%, in order to prevent the formation of soap and emulsions that decrease the yield of the transesterification reaction for biodiesel production. The utilization of resins as heterogeneous catalyst as a viable technical, economic and environmental viable alternative is presented. The use of microwaves favors the reaction by located dielectric warming effects of the alcohol and the catalyst

Modificación de placas de concreto con tio2 para la degradación fotocatalítica de contaminantes líquidos

Concrete plates were impregnated with TiO2 using two methods of support: painting coating and deposition of a mixture of gray cement and TiO2, Degussa P-25. The first method was the application of TiO2 sol-gel formed from tetraetilortosilicato, isopropanol, water and hydrochlorate acid. The physicochemical properties of the new materials were determined using Scanning Electronic Microscopy, Infrared Spectroscopy- Attenuated Total Reflectance, abrasive, erosive and photochemical tests. The obtained films were stable, consistent, with a good distribution of the semiconductor and with a photochemical activity superior to common concrete.

Impregnación de TIO2 sobre borosilicato por el método sol-gel usando inmersión a velocidad controlada

TiO2 was supported on borosilicate glass producing resistant, uniform and photoactive films. The support matrix, composed by silica, was synthesized by sol-gel method, in which the TiO2 was dispersed at high speeds. Tubes of borosilicate glass, previously treaty with HCl, were submerged in the sol at controlled speed; finally, the supported materials were thermal treated to 100°C during 4 hours. The films were characterized using UV-Vis spectroscopy, SEM and EDX while the Film photoactivity was evaluated in the degradation of 4-chlorophenol, using HPLC and UV-Vis spectroscopy to follow the reaction. Results showed a 4-chlorophenol degradation of 90% with kinetic of order 1 and hydroxiquinone and benzonquinone as photodegradation by-products.