Abstract:

The CoMo/La2O3-Al2O3 selective hydrodesulfurization catalysts were prepared and characterized by BET, XRD, H2-TPR, XPS and TEM. Then the HDS performance of the catalysts was evaluated in a continuous flow fixed-bed micro-reactor. The results show that the addition of suitable content La can weaken the interaction between support and active component, facilitate the reduction of active component and the sulfidation of Mo, and is beneficial to the formation of CoMoS phase. The catalyst with 1.0% La2O3 shows the optimal selective HDS activity. With an FCC gasoline as the feed, the sulfur content in the heavy fractions (>65 ℃) can be reduced to 11.2 μg/g from 120.8 μg/g and the research octane number (RON) loss is 1.1. After blending with caustic-treated light fraction, the sulfur content in product gasoline is 9.0 μg/g and the RON loss is 0.8.

Key words: selective hydrodesulfurization, catalyst, support, lanthanum