Journal
CATALYSIS LETTERS
Volume 141, Issue 2, Pages 339-346Publisher
SPRINGER
DOI: 10.1007/s10562-010-0498-6
Keywords
Ionic liquid; Bi-functional; One-step synthesis; Dimethyl carbonate; Carbon dioxide
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Funding
- National Natural Science Foundation of China [20533080]
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One kind of novel ionic liquids (ILs) with a tertiary amino moiety and a quaternary ammonium group were synthesized and identified by FT-IR, H-1 and C-13 NMR. The elemental chemical state and basicity of ILs were determined by XPS and Hammett indicator method, respectively. Then the catalytic performance of these bifunctional catalysts was investigated in one-step synthesis of dimethyl carbonate (DMC) from ethylene oxide (EO), carbon dioxide and methanol. The best catalytic performance with 99% EO conversion and a maximum of 74% DMC selectivity was obtained using [N-111,N-6N11]I as catalyst under optimized reaction conditions. And the catalyst could be reused for several times. Normally, stronger basicity could be obtained by altering the anions with different nucleophilicity in ILs and a better catalytic activity could be achieved correspondingly. A mechanism that both the ring opening of epoxide through nucleophilic attacks and the transesterification play an important role in the reaction was proposed based on experimental results.
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