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晶化时间对zsm-5/mcm-48复合分子筛结构及mtg反应性能的影响

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Keywords: zsm-5/mcm-48,晶化时间,mtg,汽油,芳烃

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Abstract:

?采用两步晶化法制备zsm-5/mcm-48微介孔复合分子筛,通过调变前驱体溶胶的晶化时间获得不同结构的zsm-5/mcm-48基分子筛催化剂。采用xrd、n2-吸附、sem、tem、ft-ir和py-ftir等手段进行表征,结果表明,前驱体溶胶的晶化时间对zsm-5/mcm-48复合分子筛的结构和表面酸性产生重要的影响,而特定结构的复合分子筛基催化剂可以显著改变甲醇制汽油(mtg)反应的产物分布,与zsm-5基催化剂相比显著降低了油品中芳烃和均四甲苯的含量。阐明了其催化作用机制是由于介孔结构的mcm-48对微孔结构的zsm-5界面或表面的修饰作用。

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