Chemoselective O- versus C-alkylation of substituted phenols with cyclohexene over mesoporous ZSM-5
作者:Hailian Jin、Mohd Bismillah Ansari、Sang-Eon Park
DOI:10.1016/j.apcata.2013.12.025
日期:2014.2
Chemoselective O- versus C-alkylation of substituted phenols such as phenol, p-cresol, and guaiacol with cyclohexene were investigated over various ZSM-5 catalysts with different degree of mesoporosity and external acidity such as mesoporous ZSM-5 synthesized by microwave induced assembly via electrostatic interaction between sulfonic acid, functionalized or non-functionalized ZSM-5 nanozeolites and
在各种介孔度和外部酸度不同的ZSM-5催化剂上(例如通过微波诱导组装的介孔ZSM-5),研究了取代的酚(例如苯酚,对甲酚和愈创木酚)与环己烯的化学选择性O-对C-烷基化反应。磺酸,功能化或非功能化ZSM-5纳米沸石与反阳离子表面活性剂以及具有或不具有磺酸功能化和表面活性剂的水热合成微孔ZSM-5之间的静电相互作用。O-和C-烷基化产物的选择性随介孔度的不同而变化。C的选择性烷基化产物随介孔体积和外部酸位的增加而增加,而邻烷基化产物则下降。在微波下通过磺酸功能化合成的介孔ZSM-5不仅显示出最高的介孔率和外部酸位,而且表现出最佳的催化活性和C-烷基化产物的选择性,而其他ZSM-5催化剂主要是由于生成了O-烷基化产物限制散装产品的扩散。