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Catalytic hydroprocessing of simulated coal tars

1989; Elsevier BV; Volume: 54; Issue: 1 Linguagem: Inglês

10.1016/s0166-9834(00)82357-x

1873-3867

J.L. Lemberton, M. Touzeyidio, M. Guisnet,

Catalysis and Hydrodesulfurization Studies

The conversion of tars from coal pyrolysis into light aromatics, such as BTX (benzene-toluene-xylenes) and naphthalene, requires the hydrocracking of heavy polyaromatics in the presence of nitrogen- and oxygen-containing compounds. The hydroconversion of phenanthrene, which occurs through bifunctional catalysis, was chosen as a model reaction. It was carried out over a sulphided Ni-Mo/Al2O3 catalyst in the presence of carbazole and 1-naphthol. Carbazole poisons slightly through coking both the hydrogenating and the acid sites of the catalyst. 1-Naphthol has a more significant deactivating effect: the hydrogenating sites of the catalyst are poisoned by the water eliminated from 1-naphthol and the acid sites by coke generated by 1-naphthol. Lastly, the hydrogenating activity of the catalyst is not substantially affected in the presence of carbazole and 1-naphthol, but its cracking activity is much reduced, making it impossible for the catalyst to achieve the hydrocracking of phenanthrene into light aromatics.