Abstract:

The effect of ammonia on poly-aromatic selective hydrogenation saturation was studied with Ni-Mo-W/γ-Al2O3 and Co-Mo/γ-Al2O3 catalysts using LCO as a feed. The results indicate that the introduction of NH3 reduces slightly the saturation rate of poly-aromatics, and affects the mono-aromatics selectivities on different types of catalysts. At the same saturation rate of poly-aromatics, the ammonia addition increases the mono-aromatic selectivity for Ni-Mo-W catalyst, but no effect on HDN reaction is found; while for Co-Mo/γ-Al2O3 catalyst, no influence on the mono-aromatic selectivity is observed but significant inhibition of HDN reaction when increasing NH3 concentration. It is concluded that adding NH3 can improve selectivity for mono-aromatic on Ni-Mo-W/γ-Al2O3 catalyst.

Key words: FCC light cycle oil, selectivity, hydrogenation catalyst, hydrogenation saturation