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Efecto del hidroperóxido de cumeno sobre la desulfuración oxidativa

 

Cumena hidroperoxide effect on the oxidative desulfurization

 

M.A. Alvarez-Amparán y L. Cedeño-Caero*

 

UNICAT, Dpto. de Ingeniería Química, Fac. de Química, UNAM, 04510, México D.F.* Autor para la correspondencia. E-mail: caero@unam.mx Tel. (5255)-5622-5369, Fax 56-22-53-66.

 

Recibido 27 de mayo de 2014.
Aceptado 14 de agosto de 2014.

 

Resumen

Catalizadores con diferente contenido teórico de molibdeno (0.8, 1.0, 1.7 y 2.5 átomos de Mo/nm²) fueron preparados por impregnación húmeda con soluciones acuosas de ácido oxálico y heptamolibdato de amonio (pH=0) sobre γ -alúmina, para evaluar el desempeño del hidroperóxido de cumeno (HPC) como agente oxidante en el proceso de desulfuración oxidativa (ODS). Los catalizadores fueron caracterizados por difracción de rayos X (DRX), microscopía electrónica de barrido (SEM-EDX) y reducción a temperatura programada (TPR). La actividad catalítica se analizó en términos de los productos de oxidación de DBT y sus alquil-substituidos (4-MDBT y 4,6-DMDB T). Los resultados mostraron que el HPC exhibe alta reactividad en el proceso de ODS y que la actividad es debida a dos contribuciones: la reacción catalítica heterogénea y la reacción homogénea no catalítica, siendo esta última importante.

Palabras clave: hidroperóxido de cumeno, óxido de molibdeno, desulfuración oxidativa, dibenzotiofenos.

 

Abstract

Supported molybdenum catalysis were prepared by wet impregnation of acidic solutions of oxalic acid and ammonium heptamolibdate at pH=0 on y-alumina, with theoretical metal loadings of: 0.8, 1.0, 1.7 and 2.5 Mo atoms/nm². The catalysts were used in the oxidative desulfurization (ODS) process in order to evaluate the catalytic performance of cumene hidroperoxide (CHP) as oxidant agent. The catalysts were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM-EDX) and temperature-programmed reduction (TPR). Catalytic activity results were discussed in terms of the oxidant products of DBT and its alkyl-substitued (4-MDBT and 4,6-DMDBT). Results showed high reactivity of CHP as oxidant in the ODS process and that activity is due to two contributions: the heterogeneous catalytic reaction and the homogeneous non-catalytic reaction, the last one being important.

Keywords: cumene hidroperoxide, molybdenum oxide, oxidative desulfurization, dibenzothiophenes.

 

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Agradecimientos

Los autores agradecen a la DGAPA-UNAM (IN-115514) por el apoyo económico. Se agradece al Consejo Nacional de Ciencia y Tecnología la beca de doctorado para M.A. Alvarez A. A C. Salcedo (DRX) e I. Puente (SEM-EDX) por la asistencia técnica.

 

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