催化裂化汽油在磷改性Ni/ZSM-5催化剂上的降烯烃工艺研究

采用浸渍法制备了Ni/ZSM-5和NiP/ZSM-5催化剂，其中Ni、P分别为HZSM-5质量的3％和0.5％。以锦州石化公司重油FCC汽油为原料，考察了助剂P加入前后催化剂的降烯烃反应性能。结果表明, NiP/ZSM-5催化剂具有较好的加氢降烯烃、异构化和芳构化活性，液体收率较高；考察了工艺条件对NiP/ZSM-5催化剂降烯烃反应的影响。在温度310 ℃、液时质量空速3 h^－1、氢油体积比300和反应压力2.5 MPa的最佳反应条件下，FCC汽油烯烃转化率、液体收率、产品中异构烷烃和芳烃的质量分数分别为72.9％、82.1％、45.84％和30.44％，而产品辛烷值不降低，达到了既降烯烃又不损失辛烷值的预期目的。

Development of an olefin-reducing technology for FCC gasoline over Ni/ZSM-5 modified by phosphorus

Ni/ZSM-5 and NiP/ZSM-5 catalysts were prepared by impregnation, with massfraction of nickel and phosphorus in the catalysts of 3% and 0.5%, respectively.A comparison test was carried out with and without doping of phosphorus into Ni/ZSM-5 for olefin-reducing of heavy oil FCC gasoline . The test results showed that NiP/ZSM-5 exhibited high activity for olefin-reducing, isomerization and aromatization with high liquid yield. Olefin conversion of 72.9%, liquid yield of 82.1%, mass fraction of isoparaffins of 45.84% and mass fraction of aromatics of30.44% in the product were obtained, respectively, under optimum reaction condition, i. e., 310 ℃, WHSV = 3.0 h^－1, hydrogen-to-oil volumetric ratio = 300 and 2.5 MPa, without loss of octane number.