HomeM. Elena Meza-de la Rosa

Papers by Author: M. Elena Meza-de la Rosa

Paper TitlePage

Structure Sensitivity of Sol-Gel Alkali Tantalates, ATaO₃ (A= Li, Na and K): Acetone Gas Phase Condensation

Authors: Leticia M. Torres-Martínez, M. Elena Meza-de la Rosa, Lorena L. Garza-Tovar, Isaías Juárez-Ramírez, Francisco Tzompantzi, Gloria Del Angel, Juan M. Padilla, Ricardo Gómez

Abstract: Perovskite-type compounds such as alkali tantalates, ATaO3 (A = Li, Na and K), prepared by the sol-gel method are reported as heterogeneous basic catalysts for the acetone aldol condensation. It has been proposed that the activity order and the selectivity patterns (LiTaO3 > > KTaO3 > NaTaO3) depend on the octahedral arrangements of the TaO6 tantalates.

Photocatalytic Activity of Doped NaTaO₃ and NaNbO₃ : (Y, La, Nd, Sm) Sol Gel on Degradation of Rhodamine B by UV Irradiation

Authors: Leticia M. Torres-Martínez, Lorena L. Garza-Tovar, M. Elena Meza-de la Rosa, A. Martínez-de la Cruz, Arquímedes Cruz-López

Abstract: The catalytic photodegradation of Rhodamine B with UV irradiation over NaMO3 (M= Ta and Nb) doped with Y2O3, La2O3, Nd2O3 and Sm2O3 has been studied in our laboratories. All catalysts were characterized by different techniques such as X-ray powder diffraction (XRD) and thermal analysis (DTA/TGA). Surface characterization of the solids was carried out from adsorption isotherms and infrared spectroscopy (FTIR). The band gap energy (Eg) of materials ranged from 4.1 to 2.9 eV. For comparative purpose the materials studied as catalysts were also synthesized by classical solid state reaction.

103