FCC汽油选择性HDS催化剂Co-Mo/镁铝尖晶石-Al2O3的研制

 采用镁铝尖晶石(MgAl2O4)对γ-Al2O3进行了改性，并以其为载体，以Co-Mo为活性组元，采用等体积浸渍法制备了一系列MgAl2O4含量不同的CO-MO / MgAl2O4-Al2O3催化剂。以FCC汽油为原料，在高压微反装置上对CO-MO / MgAl2O4-Al2O3催化剂的加氢脱硫活性进行了评价，计算了催化剂的HDS选择性因子。采用低温N2吸附、XRD、NH3-TPD、Py-IR及TPR手段对镁铝尖晶石改性后载体和相应催化剂进行了表征。结果表明，CO-MO / MgAl2O4-Al2O3催化剂具有较高的HDS活性和较大的HDS选择性因子。镁铝尖晶石的加入减弱了载体的酸性，减弱了金属与载体的相互作用，提高了催化活性，降低了反应温度，从而使催化剂的HDS选择性因子提高。在MgAl2O4-Al2O3载体中镁铝尖晶石质量分数为50%时，其所制备的CO-MO / MgAl2O4-Al2O3的HDS选择性因子达到最大值。

PREPARATION SELECTIVE HYDRODESULFURIZATION CATALYST Co-Mo/MgAl2O4-Al2O3 FOR FCC GASOLINE

The γ-Al2O3 was modified by magnesium-aluminum spinel(MgAl2O4), and a series of modified γ-Al2O3 supported Co-Mo catalysts(CO-MO/MgAl2O4-Al2O3)were prepared by impregnation method. The HDS performances of CO-MO/MgAl2O4-Al2O3 were evaluated in a high-pressure micro-reactor system, by using catalytic cracking gasoline as feedstock, and the HDS selectivity factor was calculated. The modified supports and catalysts were characterized by methods of N2 adsorption-desorption, XRD, NH3-TPD, Py-IR and TPR. The results indicated that CO-MO/MgAl2O4-Al2O3 showed high HDS activity and alkene saturation selectivity. The addition of MgAl2O4 in supported CO-MO catalyst could decrease the acidity of supports and also reduce the reduction temperatures, which were beneficial for increasing HDS activity and HDS selectivity factor. When the optimum mass fraction of magnesium-aluminum spinel addition was 50% in MgAl2O4-Al2O3 support of CO-MO/MgAl2O4-Al2O3, the HDS selectivity factor reached its maximum value.