Journal
JOURNAL OF CO2 UTILIZATION
Volume 48, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.jcou.2021.101519
Keywords
CO2 transformation; Ionic liquid; Metalloporphyrin; Cyclic carbonate
Funding
- National Natural Science Foundation of China [21774101, 21902145]
- Scientific Research Foundation of Zhejiang Sci-Tech University [18062303-Y]
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The introduction of electron-donating and electron-withdrawing functional groups can affect the catalytic activity, while the length of alkyl group in the cocatalyst significantly impacts the catalytic efficiency.
Synergistic effect between different functional groups is of significant influence on the activity of catalysts, especially for bi- or multi-component catalysts. Herein, a binary catalyst composing of metalloporphyrin (MPP) and phosphonium ionic liquid (PIL) is developed. The influence of substitution groups in both MPP and PIL on the cycloaddition addition of carbon dioxide and epoxides was comprehensively studied. The results demonstrated that the introduction of both electron-donating and electron-withdrawing functional groups in 5,10,15,20-tetraphenylporphyrin (TPP) framework was unfavorable to CO2 transformation. Moreover, PIL cocatalyst with longer alkyl group could enhance the catalytic activity obviously. When Co3+ was used as the metal active center, the binary catalyst system (TPP/Ph(3)PHexBr) could endow cyclic carbonate with a quantitative yield under the ambient condition of 50 degrees C and 1 atm CO2 pressure. The turnover frequency (TOF) value could also be as high as 191.3 h(-1). Our founding thus provides an insight into the design of binary catalysts for efficient transformation of CO2.
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