Hydrodesulfurization of dibenzothiophene and hydrogenation of phenanthrene of alumina-supported Pt and Pd catalysts

摘要

Hydrodesulfurization (HDS) reactions of dibenzothiophene (DBT) and hydrogenation (HYD) of phenanthrene (PHE)were carried out over several alumina-supported noble metal catalysts at temperatures between 200 deg C and 400 deg C and under 50 kg/cm~2 pressure. A dual noble metal catalyst, Pt(2)-Pd(10), showed similar HDS results and better HYD promotion compared with a conventional Co-Mo catalyst. Further, ~(35)S radioisotope tracer method showed that almost no labile sulfur was accumulated on Pt/Al_2O_3 catalyst in the HDS of DBT or HYD of PHE, although this catalyst showed an HDS activity comparable to that of the Co-Mo catalyst. This indicated that the mechanism of DBT HDS on noble catalysts was different from that on the conventional Mo-based catalyst.