M. Egorova, R. Prins
2004
Citations
1
Influential Citations
97
Citations
Quality indicators
Journal
Journal of Catalysis
Abstract
Abstract The influence of 2-methylpyridine and 2-methylpiperidine on the hydrodesulfurization of dibenzothiophene (DBT) and the effect of DBT on the hydrodenitrogenation of 2-methylpyridine and 2-methylpiperidine were studied over a sulfided NiMo/Al 2 O 3 catalyst at 5 MPa, 35 kPa H 2 S, and 300 and 340 °C. Both N-containing molecules strongly suppressed the hydrogenation pathway of the hydrodesulfurization of DBT and inhibited the direct desulfurization route at both reaction temperatures. The inhibitory effect on the direct desulfurization was stronger for 2-methylpyridine than for 2-methylpiperidine. H 2 S promoted the hydrogenation of 2-methylpyridine up to 10 kPa and inhibited it at higher partial pressures. H 2 S had a positive influence on the hydrodenitrogenation conversions of 2-methylpiperidine and 2-methylpyridine. DBT had a negative effect on the hydrogenation of 2-methylpyridine, but did not influence the CN bond cleavage of 2-methylpiperidine. Therefore, CN and CS bond breaking takes place at different active sites, whereas the hydrogenation sites for N- and S-containing molecules may be the same.