Citation: Guoqin Wang, Heyuan Song, Ruiyun Li, Zhen Li, Jing Chen. Olefin oligomerization via new and efficient Brönsted acidic ionic liquid catalyst systems[J]. Chinese Journal of Catalysis, ;2018, 39(6): 1110-1120. doi: 10.1016/S1872-2067(18)63071-2 shu

Olefin oligomerization via new and efficient Brönsted acidic ionic liquid catalyst systems

Guoqin Wang ^a,b, ,
Heyuan Song ^a,b ,
Ruiyun Li ^a,b ,
Zhen Li ^a ,
Jing Chen ^a

a State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, Gansu, China;
b University of Chinese Academy of Sciences, Beijing 100049, China

Received Date: 28 December 2017
Revised Date: 11 April 2018

Fund Project: This work was supported by the National Natural Science Foundation of China (21473225).

Olefin oligomerization reaction catalyzed by new catalyst systems (a Brönsted-acidic ionic liquid as the main catalyst and tricaprylylmethylammonium chloride as the co-catalyst) has been investigated. The synthesized Brönsted acidic ionic liquids were characterized by Fourier transform infrared spectroscopy (FT-IR), ultraviolet-visible spectroscopy (UV), ¹H nuclear magnetic resonance (NMR), and ¹³C NMR to analyze their structures and acidities. The influence of different ionic liquids, ionic liquid loading, different co-catalysts, catalyst ratios (mole ratio of ionic liquid to co-catalyst), reaction time, pressure, temperature, solvent, source of reactants, and the recycling of catalyst systems was studied. Among the synthesized ionic liquids, 1-(4-sulfonic acid)butyl-3-hexylimidazolium hydrogen sulfate ([HIMBs]HSO₄) exhibited the best catalytic activity under the tested reaction conditions. The conversion of isobutene and selectivity of trimers were 83.21% and 35.80%, respectively, at the optimum reaction conditions. Furthermore, the catalyst system can be easily separated and reused; a feasible reaction mechanism is proposed on the basis of the distribution of experimental products.
- Brönsted acidic ionic liquid,
- Olefin,
- Oligomerization,
- Catalysis,
- Co-catalyst
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