The Effect of Zeolite Structure on the Activity and Selectivity in p-Xylene Alkylation with Isopropyl Alcohol
The Effect of Zeolite Structure on the Activity and Selectivity in p-Xylene Alkylation with Isopropyl Alcohol
复制标题
沸石结构对二甲苯异丙醇烷基化反应活性和选择性的影响
DOI：
10.1007/s10562-009-0039-3
复制
发表时间：
2009
影响因子：
2.8
通讯作者：
J. Čejka
中科院分区：
文献类型：
--
作者：
Z. Musilová;M. Kubů;A. Burton;S. Zones;M. Bejblová;J. Čejka
考察了新型分子筛SSZ-33和SSZ-35在对二甲苯与异丙醇烷基化反应中，沸石结构和孔道尺寸对对二甲苯转化率和1-异丙基-2，5-二甲基苯选择性的影响。并与贝塔沸石、丝光沸石、ZSM-11和ZSM-5沸石的催化性能进行了比较。结果表明，除SSZ-35分子筛具有一维10环孔道体系外，对二甲苯转化率随沸石分子筛孔道体系的孔径和连通性的增加而增加。SSZ-35沸石分子筛具有一维10环孔道体系，该体系周期性地向18环外接的宽浅空腔开放。在150℃反应温度下，SSZ-35沸石的转化率最高，1-异丙基-2，5-二甲基苯的选择性也最高。分子模拟证实，18环笼子的尺寸对该烷基化产物的形成是最佳的。
The effect of zeolite architecture and channel dimensionality onp-xylene conversion and selectivity to 1-isopropyl-2,5-dimethyl-benzene was investigated in p-xylene alkylation with isopropyl alcohol over novel zeolites SSZ-33 and SSZ-35. Catalytic behavior of these zeolites was compared with those of zeolites Beta, mordenite, ZSM-11 and ZSM-5. It was found that p-xylene conversion increases with increasing pore size and connectivity of the channel system of individual zeolites with the exception of SSZ-35, which possesses a system of one-dimensional 10-ring channels that periodically open into wide, shallow cavities circumscribed by 18-rings. SSZ-35 exhibited the highest conversion among all zeolites at the reaction temperature of 150 °C and also the highest selectivity to 1-isopropyl-2,5-dimethyl-benzene. Molecular modeling confirmed the dimensions of the 18-ring cages are optimal for the formation of this alkylation product.