Lucio-Ortiz C.J.,Autonomous University of Nuevo León |
De La Rosa J.R.,Autonomous University of Nuevo León |
Ramirez A.H.,Autonomous University of Nuevo León |
De Los Reyes Heredia J.A.,Metropolitan Autonomous University |
And 3 more authors.
Journal of Sol-Gel Science and Technology | Year: 2011
Two mesoporous alumina samples were synthesized using the sol-gel method, and these samples were tested as catalysts in trichloroethylene combustion reaction. One alumina sample was doped with Fe to study the influence of a small amount of this agent on the characteristics and properties of alumina as a catalyst. Both catalysts (pure alumina and alumina doped with Fe) were thoroughly characterized by different techniques, such as DTA/TGA, FT-IR, XRD, SEM and TEM, and the porous characterization was conducted using a N2 physisorption technique. The doping agent presented a particular influence on the morphology and textural porosity in the alumina catalyst and therefore, it exhibited different catalytic behavior than the pure alumina catalyst. For both catalysts, the crystalline phase of γ-alumina was reported using XRD technique, and the crystallite size ranged from 7.8 to 12.8 nm. Using TEM images, the alumina catalyst doped with Fe revealed to contain a mixture of three types of iron oxide (maghemite, magnetite and hematite), mainly as roughly spherical nanoparticles. For both alumina catalysts, trichloroethylene catalytic combustion was conducted on a packed bed reactor in air at a temperature range of 50 to 600 °C. The alumina catalyst doped with Fe showed a higher catalytic activity than pure alumina, mainly due to the presence of micropores and grain morphology of flat faces. © Springer Science+Business Media, LLC 2011.
Cordova M.O.N.,National Autonomous University of Mexico |
Flores Ramirez C.I.,National Autonomous University of Mexico |
Bejarano B.V.,National Autonomous University of Mexico |
Arroyo Razo G.A.,National Autonomous University of Mexico |
And 3 more authors.
International Journal of Molecular Sciences | Year: 2011
In this work, the results of a study comparing the use of irradiation from different regions of the infrared spectrum for the promotion of several organic reactions, are presented and discussed. This use of eco-conditions provides a green approach to chemical synthesis. A set of ten different organic reactions were evaluated, including the Knoevenagel, Hantzsch, Biginelli and Meldrum reactions. It is important to highlight the use of a commercial device that produces infrared irradiation in the near infrared region and its distribution by convection providing heating uniformity, significantly reducing reaction times, achieving good yields and proceeding in the absence of solvent. It is also worth noting that a variety of different reactions may be performed at the same time. Finally, the products obtained were identified using TLC, together with corresponding MS-data, complementarily in comparison of NMR 1H and 13C data with literature information. © 2011 by the authors; licensee MDPI, Basel, Switzerland.