Efecto de la relación Si/Al en la hidrodesulfuración profunda de catalizadores Pt/Al-MCM41

Effect of Si/Al ratio in deep hydrodesulfurization of Pt/Al-MCM41 catalyts

J.A. Colín-Luna¹*, A.K. Medina-Mendoza¹, J.A. De los Reyes², J. Escobar³, J. A. Montoya de la Fuente y R. Suárez P.⁴

¹ UAM-A, Av. San Pablo 180, Reynosa, Tamps., 02200, México D.F. *Autor para la correspondencia. E-mail: jacl@correo.azc.uam.mx Tel. 01-55-53189044, Fax 5394 7378.

³ IMP, Lázaro Cárdenas 152, San Bartolo Atepehuacan, 07730, México D.F.

⁴ IER-UNAM, Priva da Xochicalco s/n, Temixco Morelos, 62580.

Recibido 20 de febrero de 2012
Aceptado 23 de abril de 2013

Resumen

En el presente trabajo se prepararon catalizadores de Pt (1% peso, humedad incipiente) soportados sobre sílice mesoporosa MCM-41 modificadas con Al empleando el método del injerto químico a relaciones másicas de Al₂O₃/SiO₂ = 10, 25 y 40. Dichos materiales se caracterizaron y ensayaron en la HDS de dibenzotiofeno y 4,6-dimetildibenzotiofeno como moléculas modelo en un reactor por lotes a condiciones cercanas a las industriales (320°C y 5.5 MPa). Los catalizadores de Pt presentaron una buena actividad frente al catalizador de referencia Pt/Al₂O₃ de acuerdo al siguiente orden Pt/Al(40)MCM41 > Pt/Al(10)MCM41 ≈ Pt/Al(25)MCM41 > Pt/Al₂O₃ » Pt/MCM41 y selectividad hacia productos de una desulfuración directa. La HDS del 4,6-DMDBT mostro que el catalizador de Pt soportado en la MCM41 modificado con Al a una relación SiO₂/Al₂O₃ igual a 40 mantiene su mejor actividad que el soportado en Al₂O₃. Estos resultados muestran un efecto importante del Al en la HDS de moléculas altamente refractarias.

Palabras clave: hidrodesulfuración profunda, DBT, MCM-41, injerto químico, Pt/AlMCM-41.

Abstract

In this work Pt catalysts (1 wt.%) were prepared by incipient wetness impregnation employing a series of mesoporous Al-modified MCM-41 at Al₂O₃/SiO₂ mass ratios equal to 10, 25 y 40 by means of chemical grafting method. Such materials were characterized and tested in the HDS of ditenzothiophene (DBT) and 4,6 dimethyldibenzothiophene (4,6-DMDBT) as model molecules in a batch reactor to similar industrial conditions (320 °C and 5.5 MPa). These Pt catalysts exhibited higher activity than Pt/Al₂O₃ used as a reference. The order of activities was: Pt/Al(40)MCM41 > Pt/Al(10)MCM41 ≈ Pt/Al(25)MCM41 > Pt/Al₂O₃ » Pt/MCM41 and selectivity was mainly to desulfurization products. The most active catalyst was tested in the HDS of 4,6-DMDBT and the resulte showed an important effect for Al in the HDS of highly refractory molecules.

Keywords: deep hydrodesulfurization, DBT, MCM-41, grafting method, Pt/MCM-41.

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Agradecimientos

Uno de los autores (A.K. Medina-Mendoza) agradece al CONACYT por la beca de posgrado 202774.

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