Abstract: Mesoporous ZrO2/Ti-MCM-41 materials were synthesized under hydrothermal conditions，and characterized with XRD，FT-IR，UV-Vis and nitrogen adsorption-desorption. The results showed that the obtained materials were mesoporous molecular sieves with long-range order. The crystallinity of ZrO2/Ti-MCM-41 became poor with the increase of ZrO2. ZrO2/Ti-MCM-41 was used as catalyst in the pyrolysis of PP. The influences of reaction conditions，such as n(Si)∶n(Ti)，content of ZrO2，temperature，dosage of catalyst and reaction time on the pyrolysis results were examined. Under the optimum conditions of n(Si)∶n(Ti)=40，mass percentage of ZrO2 18%，temperature 400℃，m(catalyst)∶m(PP)=0.02 and reaction time 0.5 h，the conversion was 91.2% and the yield of liquid products was 83.6%. Compared with the results obtained by thermal pyrolysis and catalytic pyrolysis on HZSM-5，ZrO2/Ti-MCM-41 was of better catalytic activity and higher yield of liquid products，and was especially suitable for the pyrolysis of sterically hindered polymers，such as PP.

摘要： 采用水热合成法制备了中孔分子筛ZrO2/Ti-MCM-41，通过XRD、N2吸附-脱附、FT-IR、UV-Vis对其进行表征，表明其具有中孔结构，并且随着ZrO2含量的增加，ZrO2/Ti-MCM-41孔道的长程有序性和结晶度有所减弱，直至失去中孔结构。将其应用于聚丙烯(PP)的催化裂解反应，通过考察硅钛比、负载量、反应温度、催化剂用量和反应时间，对ZrO2/Ti-MCM-41催化裂解PP反应的规律进行了研究。结果表明，n(Si)∶n(Ti)=40，ZrO2负载质量分数为18%的ZrO2/Ti-MCM-41，在反应温度400 ℃，m(ZrO2/Ti-MCM-41)∶m(PP) =0.02，反应时间30 min的条件下，PP的转化率可达91.2%，液体产物的收率为83.6%，该结果优于热裂解及传统的HZSM-5小孔分子筛催化剂的催化裂解结果。