不同ZSM-5分子筛对增产低碳烯烃的性能对比及改性研究

低硅择形分子筛在增产液化气和丙烯方面优于高硅择形分子筛,但加入低硅择形分子筛助剂后汽油收率降低幅度较大。改性后ZSM-5分子筛制备的催化剂与未改性ZSM-5分子筛制备的催化剂相比,液化气和丙烯产率均有明显提高,重油产率明显降低,转化率升高,总液收基本不变,汽油中烯烃含量有所降低,芳烃含量提高。

Performance comparison of and modification research on ZSM-5 molecular sieves for improving output of low-carbon olefins

The performance of shape-selective molecular sieve catalyst with low silicon content such as improving output of liquefied petroleum gas and propylene were better than that of shape-selective catalysts with high silicon content,but the yield of gasoline decreased significantly if the additive with low silicon content was added.Compared with the catalyst prepared by using the original ZSM-5 molecular sieve,the properties of the catalyst prepared with modified ZSM-5 molecular sieve were enhanced,and the yield of liquefied petroleum gas and propylene and the conversion were obviously increased,and heavy oil yield was reduced remarkably;the content of aromatic compounds in gasoline was increased and the content of olefin was slightly decreased,while the total liquid yield was kept unchanged.