Abstract: The selective hydrodesulfurization performance of three kinds of aluminas and the ZnO/θ-Al2O3 catalyst was studied with full-range FCC gasoline as the feedstock. The selective factor of θ-Al2O3 for the hydrodesulfurization of the full-range fluidized catalytic cracking gasoline is much higher than those of γ-Al2O3 and γ-Al2O3 calcined at 900 ℃. Impregnation of θ-Al2O3 with ZnO can further enhance the hydrodesulfurization activity and selectivity of θ-Al2O3. The characterization results of pyridine adsorption Fourier transform infrared spectroscopy (FT-IR), H2 temperature-programmed reduction (H2-TPR), andX-raydiffraction indicate that there is only weak Lewis acidity on the surface of θ-Al2O3, and the FT-IR spectrum of pyridine adsorption on θ-Al2O3 is quite different from the other two aluminas. The loading of ZnO onto the surface of θ-Al2O3 results in the formation of Zn(AlO2)2 spinel structure and the shift of the high-temperature H2-TPR peak of the catalyst toward lower temperature.

Key words: full-range FCC gasoline, selective hydrodesulfurization, zinc oxide, alumina, Lewis acid