文献类型：期刊文献

英文题名：Br?sted acidic pyridinium-based ILs catalyzed the selective dimerization of isobutene: Performance and in-situ NMR study

作者：Yu, Xiaojia[1,2]; Liu, Ying[1]; Wang, Hui[1]; Cheng, Weiguo[1]; Wu, Youqing[2]; Zhang, Suojiang[1]

机构：[1] CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Multiphase Complex System, Beijing Key Laboratory of Ionic Liquids Clean Process, Institute of Process Engineering, Chinese Academy of Sciences, Beijing, 100190, China; [2] Department of Chemical Engineering for Energy Resources, East China University of Science and Technology, Shanghai, 200237, China

年份：2020

卷号：482

外文期刊名：Molecular Catalysis

收录：EI(收录号：20194807737862)

语种：英文

外文关键词：Butenes - Catalysis - Catalyst activity - Nuclear magnetic resonance spectroscopy - Oligomers

摘要：Br?sted acidic pyridinium-based ILs of [NS][CF3SO3] and [NS][HSO4] have been synthesized for oligomerization of isobutene with the excellent conversion of 92.8% and the good selective dimerization at the temperature of below 100 °C. Hydroxyl-containing materials, especially ethanol, could facilitate catalytic activities to excellent conversions of isobutene and 84.2% selectivity of diisobutene. [NS][CF3SO3] could be recovered by a simple liquid-to-liquid separation and reused more than ten times without obvious loss of catalytic activities. The formation process of oligomers has been examined by in-situ NMR spectroscopy, and a step-by-step generation process of carbonium ions varying from C4+, C8+ to C12+ was proposed. The work behaves the significance of constructing a better catalysis system for highly selective dimerization of isobutene, and potential being scaled-up for industrialization. ? 2019 Elsevier B.V.