【摘要】 研究了三种氧化铝载体和一种ZnO/θ-Al2O3催化剂对全馏分FCC汽油的选择性加氢脱硫性能.结果表明,θ-Al2O3对于全馏分FCC汽油的加氢脱硫选择性因子高于γ-Al2O3和在900℃下焙烧过的γ-Al2O3.负载ZnO能进一步提高θ-Al2O3的加氢脱硫活性和选择性.通过吡啶吸附傅里叶变换红外光谱、氢气程序升温还原和X射线衍射表征发现,θ-Al2O3表面只有微弱的L酸性,其吡啶吸附红外光谱明显不同于其他氧化铝.负载ZnO导致θ-Al2O3载体中出现了尖晶石结构,并且使催化剂的高温H2还原峰位向低温方向移动.更多还原

【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),and X-ray diffraction 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.更多还原