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Bifunctional Catalysts Containing Zn(II) and Imidazolium Salt Ionic Liquids for Chemical Fixation of Carbon Dioxide
Author(s) -
Shang Hui,
Bai Shiyang,
Yao Jie,
Ma Shuangshuang,
Sun Jihong,
Su Hongjing,
Wu Xia
Publication year - 2021
Publication title -
chemistry – an asian journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.18
H-Index - 106
eISSN - 1861-471X
pISSN - 1861-4728
DOI - 10.1002/asia.202001287
Subject(s) - ionic liquid , bifunctional , catalysis , chemistry , inorganic chemistry , salt (chemistry) , carbon fixation , solvent , mesoporous material , organic chemistry , carbon dioxide
Zn(II) can efficiently promote the catalytic performance of imidazolium salt ionic liquids (imi‐ILs) for the chemical fixation of CO 2 into epoxides. To obtain sustainability, immobilized bifunctional catalysts containing both imi‐ILs and Zn(II) were prepared using bimodal mesoporous silica (BMMs) as carrier, through grafting of Zn(OAc) 2 and 1‐(trimethoxysilyl)propyl‐3‐methylimidazolium chloride (Si‐imi) separately in the nanopores. The catalysts, named as BMMs−Zn&ILs, were identified as efficient catalysts for cycloaddition reaction of CO 2 into epoxides under solvent‐free conditions. BMMs−Zn&ILs showed good catalytic activity, which increased with the increase of the molar ratio of Zn(II) to Si‐imi. As a comparison, different catalytic systems including homogeneous imi‐IL, BMMs‐ILs and BMMs−Zn were studied to demonstrate different cooperation behaviors. Furthermore, the kinetics studies of homogeneous and heterogeneous bifunctional catalysts were employed to confirm the differences, as well as to support the proposed cooperative catalysis mechanism in the nanopores.