Ponente
Descripción
BIMETALLIC Cu2+-Zn2+ SYSTEM ON CLINOPTILOLITE: ION-EXCHANGE SELECTIVITY AND CATALYTIC ACTIVITY IN NO-REDUCTION.
Inocente Rodríguez-Iznaga1, Vitalii Petranovskii2, Felipe F. Castillon Barrasa2, Fernando Chávez Rivas3 and Rodolfo F. Espinosa4.
1Instituto de Ciencia y Tecnología de los Materiales (IMRE) - Universidad de La Habana, Cuba.
2Departamento de Nanocatálisis, Centro de Nanociencias y Nanotecnología (CNyN) – Universidad Nacional Autónoma de México, Ensenada, B.C. México.
3Escuela Superior de Física y Matemáticas, Instituto Politécnico Nacional (IPN) D.F., México.
4Departamento de Física, Universidad Tecnológica de la Habana “José Antonio Echevarría” (Cujae) Cuba.
E-mail:inocente@imre.uh.cu
RESUMEN:
Zeolites modified with cations and nanospecies of zinc and copper are of interest for the development of new materials with important properties such as biocide, catalytic and others. Their application fields are broad, including the catalytic reduction of noxious-gases such as NOx emitted from mobile and stationary stations with hurtful incidences due to acid-rain and smog formation, which affect the environment. Commonly, modification methods include ion exchange as one of their steps. Furthermore, materials are usually prepared with a single type of metal. However, the use of multimetallic systems can lead to improvements in both the properties of the resulting materials and the methods used for its preparation. This work is aimed to study the ion-exchange of bimetallic Cu2+-Zn2+ system in natural clinoptilolite (CLI). Besides this, the catalytic potential of mono- and bi-metallic materials in NO-reduction with CO/C3H6 was evaluated. The bimetallic materials were prepared by successive ion-exchanges; its characterization was carried out by X–ray diffraction, UV-Vis Diffuse Reflectance Spectroscopy and other techniques. The obtained results showed a higher selectivity of CLI toward Cu2+ cations with respect to Zn2+. The species with the highest catalytic activity correspond to copper. The presence of zinc enhanced this activity in the bimetallic systems compared to an only copper monometallic, which was associated with an effect of zinc on the copper active species to promote electrons transfer for NO reduction.
Palabras clave: Clinoptilolite Zeolite, Ion-exchange, Copper – Zinc, NO-reduction, bimetal system
