大孔Mo-Ni/Al_2O_3催化剂的催化裂化柴油加氢性能研究

采用三次纳米自组装合成法,制备了一种以二次纳米自组装Al2O3为主体的大孔主客体催化剂FA-40,具有0.78 cm3·g-1的孔容、114 m2·g-1的比表面积、27 nm的平均孔径、6.0 nm和40 nm的双峰孔结构、孔分布在10~100 nm高度集中、低堆积密度为0.56 g·cm-3、活性金属含量高达35.70%。XRD和TEM分析结果显示,活性金属以直径小于2 nm的微晶态纳米粒子形式均匀分散于主体表面。采用劣质催化裂化柴油进行20 h加氢实验评价,反应趋于稳定时,FA-40的脱硫、脱氮及芳烃饱和率分别达到94.4%、95.5%和67.9%,与F-5相比分别提高了20%、80%和140%。300 h的长周期加氢实验表明,FA-40具有良好的加氢性能。

Study on the Hydrogenation Performance of Macropore Mo-Ni/Al2O3 Catalyst for FCC Diesel

The big pore host-guest catalysis material FA-40 was prepared with the secondary nano-assembly Al2O₃ support by third nano-assembly technique which has a pore volume of 0.78 cm³·g^-1, a specific surface area of 114 m2·g^-1, average pore diameter of 27 nm, a structure of double peak pore of 6.0 nm and 40 nm, high concentration pore size distribution of 10~100 nm, a low stacking density of 0.56 g·cm^-3 and a concentration of metal as high as 35.70%. The results of the XRDand TEMshowed that the active metal uniformly dispersed and existed in form of the microcrystal nano bulk phase which has < 2 nm diameter on the guest surface. Using the poor quality FCCdiesel as stock feed, Hydrogenation performance of the different catalysts has been evaluated after 20 h the hydrogenation treating. The results showed that the conversion in desulfurization, denitrification and aromatics saturation for FA-40 were 94.4%, 95.5%, 67.9% and 77.6%, 52.3%, 28.7%. Compared with F-5, increased by about 20%, 80% and 140%, respectively. Stability experiments for a long period of 300 h have been shown that FA-40 was better catalyst for hydrogenation performance.