Simultaneous hydrodesulfurization and hydrodenitrogenation of model compounds over nickel-molybdenum/.gamma.-alumina catalysts

Hydrodenitrogenation of quinoline and its intermediates over sulfided NiW/γ‐Al2O3 in the absence and presence of H2S

“…The PCH/PB ratio increased from 1 to 2.15 with the increasing H 2 S concentration, indicating that H 2 S inhibits the pathway of OPA hydrogenolysis and promotes C-N bond cleavage to PCHA in the THQ5-DHQ pathway. The results are in agreement with those reported in references [15][16][17]. This can be indicated that H 2 S retards the rate determining of THQ1-OPA and promotes the rate determining reaction of DHQ-PCHA [9] .…”

Hydrodenitrogenation of 2-methylpyridine and its intermediates 2-methylpiperidine and tetrahydro-methylpyridine over sulfided NiMo/γ-Al2O3

“…It is generally accepted that the first step in the HDN of nitrogen-containing aromatic molecules is hydrogenation of the heterocyclic ring, and that C-N bond cleavage occurs thereafter [4][5][6][7][8][9]. This can be explained in part by the fact that the aromatic C=N bond is stronger than the aliphatic C-N bond.…”

Hydrodeoxygenation of benzofuran over sulfided and reduced Ni–Mo/γ-Al2O3 catalysts: Effect of H2S

“…Alumina-supported catalysts with 15%MoO 3 [18,19] involved impregnation carried out at a pH of 8 and a temperature of 60 • C. The slurry was then dried at 60 • C under vacuum followed by drying in a drying oven over night at 110 • C. The resulting powder was calcined for 4 h at 500 • C under a continuous flow of pure oxygen. The surface area of oxidic samples 184 m 2 /g, was measured using BET method with a Micromeritics ASAP2010 automatically controlled instrument, using nitrogen as adsorbent at liquid nitrogen temperature (−196 • C).…”