Composite Ionic Liquids Immobilized on MCM-22 as Efficient Catalysts for the Cycloaddition Reaction with CO2 and Propylene Oxide

Composite Ionic Liquids Immobilized on MCM-22 as Efficient Catalysts for the Cycloaddition... catalytic activity in the field of catalytic conversion of CO . Unfortunately, ILs catalysts can be only used in ket- tle catalysis as homogeneous systems, which suffered from the difficulty in product purification and catalysts recycling so affect their industrial application. In this work, a series of composite ILs were prepared by functionalized imida- zolium ILs and lewis acid (ZnBr ). Then composite ILs immobilized on molecular sieve (MCM-22) with chemical bonding to obtain heterogeneous catalysts applied in the reaction of propylene oxide and carbon dioxide to synthe- size propylene carbonate. The effects of catalytic tempera- ture, pressure and cycle times on the conversion and yield were studied. The results showed that the optimal catalyst was MCM-22-[CeMIM]Cl/(ZnBr ) , when the catalytic 2 2 temperature is 120 °C, the pressure is 2.5 MPa and the dos- age of catalyst is 2.0%, the conversion rate is 100%, and selectivity is 97.4%. Keywords Ionic liquids · Immobilization · Cycloaddition · Heterogeneous catalysis · CO fixation 1 Introduction Carbon dioxide (CO ) is the main reason causing global “greenhouse effect”, at the same time, it is important to fix CO in chemical industry owing to its being abundant, cheap, non-toxic and renewable [1, 2]. Therefore, many attempts Catalysis Letters Springer Journals

Composite Ionic Liquids Immobilized on MCM-22 as Efficient Catalysts for the Cycloaddition Reaction with CO2 and Propylene Oxide

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Copyright © 2017 by Springer Science+Business Media, LLC
Chemistry; Catalysis; Industrial Chemistry/Chemical Engineering; Organometallic Chemistry; Physical Chemistry
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