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120 mL/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 w-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 temperature＞ rare earth type in modified support＞H2 flow rate＞phosphomolybdic acid content in catalyst＞Ni content in catalyst＞ reduction temperature; factors affecting the conversion of n-heptane were in the order of reaction temperature＞Ni content in catalyst＞H2 flow rate＞phosphomolybdic acid content in catalyst!＞re-duction temperature＞rare 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 phosphomolyb-dic acid mass fraction of 20%, H2flow 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%.
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