含Mg加氢异构脱蜡催化剂临氢异构性能研究

以制备的H-ZSM-23分子筛为载体，采用等体积共浸渍的方法制备加氢异构催化剂Pt/ZSM-23，Pt-Mg/ZSM-23-1%，Pt-Mg/ZSM-23-2%，研究Mg的引入对催化剂酸性质的影响，并以惠州加氢裂化尾油为原料，对Pt/ZSM-23和Pt-Mg/ZSM-23-2%的临氢异构性能进行研究。研究结果表明：Mg的引入可极大降低催化剂的中强酸含量，催化剂选择性提高；将Pt/ZSM-23和Pt-Mg/ZSM-23-2%按体积比1∶1级配装填，在反应温度为325 ℃、反应压力为13 MPa、氢油体积比为500、液时体积空速为1.1 h－1的条件下，基础油收率由75.0%提高至79.0%；1 000 h长周期运行期间催化剂性能稳定，150N润滑油基础油的倾点为－18 ℃、收率为48.0%，高于常规工业装置的46.0%，基础油总收率为79.3%，催化剂加氢异构性能优异，具备良好的工业化应用前景。

STUDY ON PERFORMANCE OF MAGNESIUM-PROMOTED HYDROISODEWAXING CATALYST

Pt/ZSM-23, Pt-Mg/ZSM-23-1% and Pt-Mg/ZSM-23-2% hydroisomerization catalysts were prepared by loading Pt and Mg on H-ZSM-23 molecular sieve by incipient co-impregnation method. The influences of magnesium on the acidity and hydroisomerization of catalysts were studied using hydrocracking tail oil as feed from Huizhou Petrochemical Company. The results showed that the introduction of the magnesium promoter resulted in the decrease of medium-strong acids, while increases their selectivities. The layered Pt/ZSM-23 and Pt-Mg/ZSM-23-2% (volume ratio of 1:1) catalyst system showed a higher yield (from 75.0% to 79.0%) and selectivity at conditions of 325 ℃, hydrogen pressure of 13 MPa, the hydrogen to oil ratio 500 and the LHSV 1.1 h-1. After 1000 h running, the catalyst exhibited a stable hydroisomerization performance. The pour point of 150N base oil is-18 ℃, the yield of 150N and total lube base oil is 48.0% and 79.3% respectively. The results indicate the good hydroisomerization performance and good industrialization prospect.