多级孔Hβ沸石对NiWP/Hβ-Al_2O_3催化剂柴油加氢性能的影响

采用碱处理法制备多级孔Hβ沸石,以不同比例与Al_2O_3混合,得到由Hβ沸石与Al_2O_3组成的混合载体,再采用等体积浸渍法制备了NiWP/Hβ-Al_2O_3系列催化剂。通过XRD、BET和NH3-TPD等手段对载体及催化剂进行了表征,以催化裂化柴油(FCC)为原料,在小型固定床反应器上,研究了多级孔Hβ沸石对NiWP/Hβ-Al_2O_3催化剂加氢反应性能的影响。结果表明,载体中加入质量分数为15%Hβ沸石,NiWP/Hβ-Al_2O_3催化剂柴油加氢性能最好;在该催化剂上,360℃、8.0 MPa、体积空速为1.0 h~(-1)和氢油体积比800的操作条件下,脱硫率达到99.77%,催化裂化柴油的密度由0.927 g/cm~3下降到0.837 g/cm~3,十六烷值由13.78提高到55.39。

Influence of hierarchically mesoporous Hβ zeolite on the performance of NiWP/Hβ-Al2O3 catalysts in diesel oil hydro-upgrading

Hβ-Al₂O₃ composite supports were prepared through mechanically mixing Al₂O₃ with hierarchically mesoporous Hβ zeolite obtained by desilication with NaOH solution; bifunctional NiWP/Hβ-Al₂O₃ catalysts were then obtained by impregnation method. The composite supports and NiWP/Hβ-Al₂O₃ catalysts were characterized by XRD, BET and NH₃-TPD; the effect of Hβ addition on the catalytic performance of NiWP/Hβ-Al₂O₃ in diesel oil hydro-upgrading was investigated in a fixed bed reactor with fluid catalytic cracking (FCC) diesel as the feed. The results showed that by adding 15% Hβ in the Hβ-Al₂O₃ composite support, NiWP/Hβ-Al₂O₃ catalyst performs best in diesel oil hydro-upgrading; under 360 ℃, 8 MPa, volume space velocity of 1.0 h^-1 and volumetric hydrogen/oil ratio of 800, the desulfurization degree reaches 99.77%, the density of FCC diesel oil is decreased from 0.927 to 0.837 g/cm³, while the cetane value is increased from 13.78 to 55.39.