La对CoMo/γ-Al_2O_3催化剂选择性加氢脱硫性能的影响

EFFECT OF La ON SELECTIVE HYDRODESULFURIZATION PERFORMANCE OF CoMo/γ-Al_2O_3 CATALYST

制备了CoMo/La_2O_3-Al_2O_3选择性加氢脱硫催化剂,通过BET,XRD,H2-TPR,XPS,TEM对催化剂进行了表征,并在固定床连续微型反应装置上考察了La_2O_3含量对催化剂活性的影响。结果表明:La的引入可以改善活性组分与载体间的相互作用,有利于金属活性组分的还原,提高了Mo的硫化程度,增加了CoMoS活性相的数量;当La_2O_3质量分数为1.0%时,催化剂有最佳的选择性加氢脱硫活性,在处理FCC汽油重馏分(>65℃馏分)时可将其硫质量分数降至11.2μg/g,RON损失1.1个单位;与碱洗轻馏分调合后,产品硫质量分数为9.0μg/g,RON损失0.8个单位。

The CoMo/γ-Al2O3 selective hydrodesulfurization catalysts were prepared and char- acterized 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 cat- alyst with 1.0 % La2 03 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.