Hidrogenación de naftaleno utilizando catalizadores NiMo/Al2O3—SiO2(x): Estudio cinético
Hydrogenation of naphthalene using NiMo/Al2O3—SiO2(x) catalysts: Kinetic study
F. Sánchez–Minero1,3*, J. Ramírez1,2, R. Cuevas–García1 y J. Ríos–Castillo3
1 UNICAT, Departamento de Ingeniería Química, Facultad de Química, UNAM, Cd. Universitaria, México O45IO, D. F., México.
2 Instituto Mexicano del Petróleo, Eje central Lázaro Cárdenas 152, México 07730, México D. F.
]]> 3 DIQP, ESIQIE, Instituto Politécnico Nacional, Zacatenco, México 07738, D.F., México. *Autor para la correspondencia. E–mail: jfsmpipen@hotmail.com Tel. 57296000 Ext. 55394.
Recibido 25 de Noviembre 2009.
Aceptado 17 de Mayo 2010.
Resumen
Dos catalizadores NiMo/Al2O3 —SiO2(x) con diferente contenido de SiO2 en el soporte (0 y 10 % en peso) fueron evaluados en la hidrogenación de naftaleno. Los productos de la reacción (tetralina y decalinas) fueron analizados para establecer un esquema simplificado de reacción. Después, fue realizado un estudio cinético utilizando ecuaciones del tipo Langmuir–Hinshelwood (L–H). Primeramente, se obtuvieron las ecuaciones L–H que presentan un mejor ajuste con los datos experimentales. Luego, fueron estimados los parámetros cinéticos (constantes aparentes de velocidad de reacción y adsorción). Para ello, se utilizó la minimización de Powell. Los resultados muestran que el catalizador con sílice alcanza una mayor actividad. Esto puede deberse a que presenta un valor de Ea inferior al desplegado por el catalizador sin sílice, lo cual esta relacionado con la dificultad para transformar el naftaleno en productos.
Palabras clave: hidrogenación, naftaleno, catalizadores, ecuaciones L–H, estudio cinético.
Abstract
]]> Two NiMo/Al2O3 —SiO2(x) catalysts with different content of SiO2 in the support (0 and 10 wt %) were evaluated in the hydrogenation of naphthalene. The reaction products (tetralin and decalines) were analyzed to establish a simplified reaction scheme. After that, a kinetic study using Langmuir–Hinshelwood (L–H) type equations was carried out. Firstly, L–H equations that present a best fit with the experimental data were obtained. Then, kinetic parameters (apparent constants of reaction rate and adsorption) were estimated. For it, the Powell's minimization was used. Results show that catalyst with silica reaches a higher activity. This is due to its low value of Ea compared with the displayed by catalyst without silica, which this one related to the difficulty to transform the naphthalene into products.Keywords: hydrogenation, naphthalene, catalysts, L–H equations, kinetic study.
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