Zn改性KL分子筛的正戊烷探针反应研究

STUDY OF PROBE REACTION OF n-PENTANE CONVERSION CATALYZED BY Zn-MODIFIED KL ZEOLITE

通过浸渍法制备一系列负载Zn的Zn/KL分子筛,采用XRD、FT-IR等方法对Zn/KL分子筛进行表征。在微反固定床上以正戊烷的异构化和芳构化为探针反应,分别考察Zn负载量(w,下同)为0.5%,1.0%,3.0%的Zn/KL分子筛的催化性能。结果表明,在反应温度为460℃、常压、体积空速1.5h-1的条件下,Zn负载量为0.5%的Zn/KL分子筛的催化性能最好,异构化率为86.72%,芳构化率为12.19%。Zn负载量为0.5%的KL分子筛(0.5%Zn/KL)与Pt/KL及Pt/Al2O3的比较结果表明,0.5%Zn/KL的异构化性能最好,但芳构化性能弱于其它二者。

A series of Zn/KL zeolite catalysts were obtained by impregnation. The synthesized samples were characterized by X-ray powder diffraction （XRD） and infrared spectroscope （FT-IR）. The catalytic properties of Zn/KL with Zn content （mass fraction） of 0.5%, 1.0% and 3.0%, respectively, were tested on a fixed-bed microreactor using the n-pentane isomerization and aromatization as a probe reaction. The results show that at the reaction temperature of 460~C, the catalyst with Zn content of 0.5% has the best catalytic performance. The isomerization rate reaches 86.72% and aromatization rate 12.19%. And compared with Pt/KL and Pt/A1203, the Zn/KL catalyst with Zn content of 0.5% has the highest isomerization rate. However, its aromatization rate is lower than that of both Pt/L and Pt/Al2O3 catalysts.