The kinetics of hydrodenitrogenation (HDN) was systematically studied in
an isothermally high-throughput reactor over three kinds of catalysts
(CoMo, NiMo, NiMoW) to produce clean diesel meeting latest national
standard of China. The influences of reaction temperature, reaction
pressure, volume ratio of H2 to oil and space time on
hydrodenitrogenation were investigated to obtain kinetic parameters.
Two-lump kinetic model considering the influence of self-inhibition was
selected for the HDN reaction of diesel oil after the comparison with
one-lump kinetic model. 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 the
simulation of catalyst stacking system. And the concentration of
nitrogen-containing compounds was predicted for the catalyst gradation
model of different loading sequences.