本文用常温合成方法合成了不同硅铝比的Al-MCM-48,并研究了硅铝比不同对Al-MCM-48催化裂解高密度聚乙烯(HDPE)的影响.发现Al-MCM-48存在的催化裂解可以提高HDPE的转化率和液体收率;硅铝比的变化对转化率和液体收率有较明显的影响,转化率和液体收率随硅铝比的增加而增加,当硅铝比达到100时达最大值,然后液体收率和转化率开始逐步下降;液体产物中的烯烃的含量随硅铝比的增加而增加;重复实验表明Al-MCM-48具有较好的稳定性,不易结焦.%Al-MCM-48 catalysts with different Si/Al molar ratio were prepared by ambience temperature synthesis technology in this paper,and the effect of Si/Al molar ratio on the catalytic pyrolysis of HDPE over Al-MCM-48 catalysts was investigated.It was found that the presence of Al-MCM-48 catalysts increase the conversion of HDPE and the yield of liquid products.The variation of Si/Al molar ratio affected the yield of liquids and the conversion of materials,obviously.Initially,the liquids yield and conversion increased with increasing Si/Al molar ratio,reached the maximum values at a Si/Al ratio of 100,and then decreased gradually with further increase of Si/Al ratio.The content of olefins in the liquid products increased with increasing Si/Al molar ratio.Repeated experiments showed that the catalysts Al-MCM-48 exhibited good stability,thus the coke formation might be non-obvious.
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