Abstract
The kinetics of hydrodenitrogenation (HDN) was studied in an
isothermally high-throughput reactor over three kinds of catalysts
(CoMo, NiMo, NiMoW) to produce ultra-low sulfur diesel. The influences
of reaction temperature, reaction pressure, volume ratio of H2 to oil
and space time were systematically investigated to obtain kinetic
parameters. By analyzing the reaction mechanism, two-lump kinetic model
considering the influence of self-inhibition was proposed for the HDN
reaction of diesel oil, and Levenberg-Marquard optimization method was
used to estimate the model parameters. The model could well predict the
evolution of nitrogen-containing compounds concentration along the axial
length of reactor. Based on the two-lump kinetic model, the simulation
on the HDN activity of various catalyst stacking schemes is close to the
experimental data, which proves the model is applicable for catalyst
stacking system. And the concentration of nitrogen-containing compounds
was predicted for the catalyst gradation model of different loading
sequences.