稀土改性MCM-41催化剂上庚烷临氢异构化反应影响因素研究  

STUDY ON THE FACTORS AFFECTING n-HEPTANE HYDROISOMERIZATION OVER RARE EARTH MODIFIED MCM-41 CATALYSTS

作　　者：汪颖军[1] 李丽蓉[1] 所艳华[1] 刘爱东[1] 

机构地区：[1]东北石油大学化学化工学院,黑龙江大庆163318

出　　处：《石油炼制与化工》2012年第6期62-66,共5页Petroleum Processing and Petrochemicals

基　　金：黑龙江省教育厅科技项目(12521063)

摘　　要：采用稀土改性MCM-41催化剂进行庚烷临氢异构化反应,通过正交实验,对影响庚烷转化率和选择性的因素进行了考察。结果表明:6个因素影响产物异构选择性的主次顺序为:反应温度>改性载体的稀土种类>氢气流速>催化剂中磷钼酸含量>催化剂中Ni含量>还原温度;6个因素影响庚烷转化率的主次顺序为:反应温度>催化剂中Ni含量>氢气流速>催化剂中磷钼酸含量>还原温度>改性载体的稀土种类。对正交实验结果进行优化,得到优化方案为:催化剂中Ni质量分数为5%、载体改性稀土为La、反应温度为300℃、还原温度为370℃、磷钼酸质量分数为20%、H2流速为120mL/min,在该条件下正庚烷转化率为13.5%、异构庚烷选择性为68%。Factors affecting the conversion and selectivity of n-heptane hydroisomerization over rare earth modified MCM-41 catalysts were investigated by orthogonal experimental design.Test results showed that the six factors affecting isoheptane selectivity were in the order of reaction temperaturerare earth type in modified supportH2 flow ratephosphomolybdic acid content in catalystNi content in catalystreduction temperature;factors affecting the conversion of n-heptane were in the order of reaction temperatureNi content in catalystH2 flow ratephosphomolybdic acid content in catalystreduction temperaturerare earth type in modified support.The orthogonal test results were further optimized as follows：using La-MCM-41 support,catalyst having Ni mass fraction of 5% and phosphomolybdic acid mass fraction of 20%,H2 flow rate of 120 mL/min,reaction temperature of 300 ℃ and reduction temperature of 370 ℃,under such conditions the conversion of n-heptane was 13.5%,and isoheptane selectivity reached 68%.

关 键 词：稀土 催化剂 磷钼酸 庚烷 临氢异构化 

分 类 号：O643.32[理学—物理化学]