Abstract

COLIN-LUNA, J.A. et al. Effect of Si/Al ratio in deep hydrodesulfurization of Pt/Al-MCM41 catalyts. Rev. Mex. Ing. Quím [online]. 2013, vol.12, n.2, pp.271-282. ISSN 1665-2738.

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.