β和Y型分子筛催化单环烷基环烷烃反应规律

Reaction law of single-cycloalkyl-naphthene catalyzed byβand Y zeolite

以十氢萘为模型化合物,采用固定床催化裂化微反装置,研究环烷基环烷烃在β和DASY(0.0)(Y型)两种分子筛及其不同配合方式的催化裂化反应规律;通过PONA分析和GC-MS表征检测十氢萘裂化产物组成;并对不同分子筛催化的反应路径进行剖析。实验结果表明,两种分子筛催化单环烷基环烷烃时,均在主要发生一个环烷环开环或异构化反应的同时,导致相邻环烷环发生芳化反应生成烷基苯或环烷基苯类;虽然β分子筛催化十氢萘反应的转化率略低,但对环烷环的开环裂化选择性明显高于DASY(0.0)分子筛,且由于β分子筛具有较低的氢转移活性,低碳烯烃产率较高;采用按照一定方式配合的两种分子筛,对于提高单环烷基环烷烃的转化率及低碳烯烃产率具有一定的协同作用。

Taking decalin as a model compound,the reaction law of cycloalkyl cycloalkanes catalytic cracking onβand DASY(0.0)(Y type)zeolites as well as on their different combination modes was studied using a fixed bed catalytic cracking microreactor.The products were characterized by PONA analysis and GC-MS.The reaction pathways over different zeolites were analyzed.The experimental results suggest that,for monocyclic alkyl cycloalkane,the ring opening or isomerization of one cycloalkane ring mainly occurred both on these two types of zeolites,which led to the aromatization of adjacent cycloalkane rings to produce alkylbenzene or cycloalkyl benzene;Although the conversion of decalin is lower onβzeolite,the ring opening cracking selectivity of cycloalkane rings performs much better than that on DASY(0.0)zeolite.Besides,βzeolite shows lower hydrogen transfer activity,leading to a high yield of low-carbon olefins;Therefore,combining these two types of zeolites in a certain way can perform a synergistic effect on improving the conversion of cycloalkylnaphthene and the yield of light olefins.