Materiales

 

Síntesis y caracterización de nanoestructuras de óxidos de CoMoW parcialmente sulfuradas y su aplicación en la HDS de DBT

 

Synthesis and characterization of partially sulfided CoMoW oxides nanostructures and their application in the HDS of DBT

 

R. Huirache–Acuña¹*, M.G. Sánchez–Bautista², J. Lemus–Ruiz², C. Ornelas³, F. Paraguay–Delgado³ y E.M. Rivera–Muñoz⁴

 

¹ Facultad de Ingeniería Química, Universidad Michoacana de San Nicolás de Hidalgo Ciudad Universitaria, 58060, Morelia, Michoacán, México. *Autor para la correspondencia. E–mail: rafael_huirache@yahoo.it Tel. +52–443–322–35–00, ext. 4316, Fax +52–443–3–16–71–76.

² Instituto de Investigaciones Metalúrgicas, Universidad Michoacana de San Nicolás de Hidalgo Ciudad Universitaria, 58060, Morelia, Michoacán, México.

³ Centro de Investigación en Materiales Avanzados, S.C, CIMAV, Miguel de Cervantes 120, Complejo Industrial Chihuahua, Chih., 31109, México.

⁴ Centro de Física Aplicada y Tecnología Avanzada, Universidad Nacional Autónoma de México, A.P. 1–1010 Querétaro, Qro., Mexico, C.P. 76000, México.

 

Recibido 5 de Agosto 2009.
Aceptado 3 de Mayo 2010.

 

Resumen

En este trabajo, se presenta la síntesis y caracterización de nanoestructuras de óxidos de CoMoW parcialmente sulfuradas y su aplicación como catalizadores en la reacción de hidrodesulfurización (HDS) de dibenzotiofeno (DBT). Las nanoestructuras se obtuvieron a través de un método en dos etapas: hidrotérmico/reducción en fase gas. En la primera etapa (hidrotérmico) se obtiene el precursor en forma de óxidos de CoMoW. Subsecuentemente, se realizó la reducción y activación de los precursores en atmósfera de H₂S/H₂ a 500 °C (reducción en fase gas). Se analizó la morfología, estructura cristalina y propiedades texturales de los materiales mediante Microscopía Electrónica de Transmisión (MET), Difracción de Rayos X (DRX), área superficial especifica por el método BET, evaluando la actividad catalítica y la selectividad en la reacción de HDS de DBT.

Palabras clave: nanoestructuras, CoMoW, hidrodesulfurización, dibenzotiofeno.

 

Abstract

In this paper, the synthesis and characterization of CoMoW nanostructured oxides, partially sulfided, as well as its application as catalysts in the reaction of hydrodesulfurization (HDS) of dibenzothiophene (DBT) is presented. All nanostructures were obtained by a two–step hydrothermal/gas phase reduction. Firstly, CoMoW oxides precursors were prepared using a hydrothermal method. Subsequently, all precursors were reduced and activated under H₂S/H₂ at 500°C. Nanostructures were characterized by transmission electron microscopy (TEM), X–ray powder diffraction (XRD) and the specific surface areas of the materials were measured using the BET method. The catalytic activity and selectivity measurements in the HDS of DBT reaction were also presented.

Keywords: nanostructures, CoMoW, hydrodesulfurization, dibenzothiophene.

 

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Agradecimientos

Los autores agradecen a W. Antúnez, E. Torres y Dra. Beatriz Milán Malo por la asistencia técnica en Microscopía Electrónica de Trasmisión y Difracción de rayos X. Este trabajo fue apoyado por CONACYT, PAPIIT–DGAPA–UNAM IN113806.

 

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