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采用水热合成法制备了不同硅铝比的中孔分子筛A l-MCM-41,将其应用于高密度聚乙烯(HDPE)和聚丙烯(PP)的催化裂解反应。通过改变硅铝比、反应温度和催化剂用量,对A l-MCM-41催化HDPE和PP裂解反应的规律进行了探讨,研究表明,HDPE裂解反应受硅铝比的影响较大;而对于PP裂解反应,硅铝比在一定范围内对催化剂活性的影响不明显。另外,与热裂解和HZSM-5小孔分子筛的催化裂解结果进行了比较,结果证明A l-MCM-41具有较高的催化活性和较高的液体产物收率,尤其适合于空间位阻较大的PP的催化裂解反应。
Mesoporous molecular sieves A l-MCM-41 with different Si / Al ratios were prepared by hydrothermal synthesis and applied to the catalytic cracking of HDPE and PP. By changing the ratio of Si to Al, the reaction temperature and the amount of catalyst, the cracking of HDPE and PP catalyzed by Al-MCM-41 was studied. The results showed that the HDPE cracking reaction was greatly affected by the Si / Al ratio. Reaction, silica-alumina ratio within a certain range of catalyst activity is not obvious. In addition, compared with the results of thermal cracking and HZSM-5 zeolites, the results show that Al-MCM-41 has high catalytic activity and high yield of liquid products, especially for steric hindrance Large PP catalytic cracking reaction.