Co-Mo/meso-Al_2O_3蜡油加氢处理催化剂的制备

PREPARATION OF Co-Mo/MESO-Al_2O_3 CATALYST FOR VACUUM DISTILLATE OIL HYDROTREATING

以Pluronic P123作结构导向剂,通过酸碱中和法制备氧化铝作载体,分别采用共浸渍法及分步浸渍法制备Co-Mo型蜡油加氢处理催化剂,其中MoO3的负载量为20.0%(w),CoO的负载量为7.81%(w)。样品的表征分析结果表明:与商用氧化铝相比,自制氧化铝具有部分有序的介孔结构、较高的比表面积及孔体积、较大的孔径及较高的结晶度;与分步浸渍法相比,共浸渍法制备的催化剂具有更大的比表面积以及更多的酸性位,且这两种催化剂中的活性组分都均匀地分散在载体上。在实验室固定床微反上对催化剂进行加氢处理性能评价,结果表明,以自制氧化铝为载体、采用共浸渍法制备的催化剂具有良好的加氢脱硫及脱氮活性。在反应温度380℃、反应压力15 MPa、体积空速0.6h-1、氢油体积比1 000∶1的条件下,催化剂的加氢脱硫率可达到99.75%,加氢脱氮率为99.86%,产品中的硫质量分数为9.4μg/g,氮质量分数为1.1μg/g,满足后续工艺的要求。

Alumina carrier was prepared by neutralization of Al(NO3)3 and NaAlO2 using surfactant Pluronic P123 as a structure guiding agent,and Co-Mo/Al_2O_3 hydrotreating catalysts with 20.0%(w)MoO3 and 7.81%(w)CoO were prepared by stepwise impregnation and co-impregnation with alumina carrier,respectively.The characterization results showed that compared with commercial alumina carrier,the self-prepared alumina has partially ordered mesoporous structure,excellent specific surface area,pore volume and pore size and high crystallinity.The co-impregnated catalyst has a higher specific surface area,more acid sites than the stepwise impregnation one.The active components Co,Mo are uniformly dispersed on the carrier for both carriers.The catalytic performance of the catalysts was evaluated in a high-pressure fixed bed reactor,and the results showed that the co-impregnation catalyst has high hydrodesulfurization and denitrification activity.At 380℃,15 MPa,space velocity of 0.6 h-1 and hydrogen to oil volume ratio of 1 000∶1,the HDS and HDN of the co-impregnation catalyst is 99.75% and99.86%,respectively,and the sulfur and nitrogen in the product are 9.4μg/g and 1.1μg/g,respectively.The hydrotreated oils can fulfill the requirement for isodewaxing.