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Ionic liquids tailored and confined by one-step assembly with mesoporous silica for boosting the catalytic conversion of CO2 into cyclic carbonates
Su, Q; Qi, YQ; Yao, XQ; Cheng, WG; Dong, L; Chen, SS; Zhang, SJ; Su, Qian; Qi, Yaqiong; Yao, Xiaoqian; Cheng, Weiguo; Dong, Li; Chen, Songsong; Zhang, Suojiang
2018
Source PublicationGREEN CHEMISTRY
ISSN1463-9262
Volume20Issue:14
Abstract

On the basis of economic and energy-saving criteria, the minimum effective dose of ionic liquids (ILs) for the catalytic conversion of CO2 into cyclic carbonates was first explored by confinement. With one-step assembly of mesoporous silica (mSiO(2)) by using a fixed amount of silicon source with varying amounts of ILs as templates, certain amounts of 1-ethyl-3-methyl imidazolium bromides (EmimBr) were tailored and confined in mSiO(2). The confined ILs (EmimBr@mSiO(2)) retained the advantages of homo- and heterogeneous catalysts, exhibiting higher performance than bulk EmimBr under identical reaction conditions. Amongst all the prepared materials, EmimBr@mSiO(2) with the lowest amount of EmimBr (6.9 wt%) exhibited the biggest improvement in catalytic activity, achieving a TOF of 112.6 h(-1) which is almost 1.7 times the bulk phase with good recyclability. The boosted catalytic activity could be attributed to the larger proportion of mesopores, the better dispersity of EmimBr (Si/Br = 25) and the synergistic effect from more exposed silanol groups (Si-OH/Br = 8) in the structure. The good recyclability was then explained by the XPS analysis and density functional theory (DFT) calculation, which confirmed that the compressing effect from Si-OH could enhance the cation and anion interaction to stabilize ILs in the space more firmly when less ILs were confined.

KeywordAtmospheric-pressure Kinetic Resolution Chemical Fixation Mild Conditions Epoxides Dioxide Nanoparticles Stability Framework Polymers
SubtypeArticle
DOI10.1039/c8gc01038b
WOS IDWOS:000438937500010
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/26732
Collection中国科学院过程工程研究所
Recommended Citation
GB/T 7714
Su, Q,Qi, YQ,Yao, XQ,et al. Ionic liquids tailored and confined by one-step assembly with mesoporous silica for boosting the catalytic conversion of CO2 into cyclic carbonates[J]. GREEN CHEMISTRY,2018,20(14).
APA Su, Q.,Qi, YQ.,Yao, XQ.,Cheng, WG.,Dong, L.,...&Zhang, Suojiang.(2018).Ionic liquids tailored and confined by one-step assembly with mesoporous silica for boosting the catalytic conversion of CO2 into cyclic carbonates.GREEN CHEMISTRY,20(14).
MLA Su, Q,et al."Ionic liquids tailored and confined by one-step assembly with mesoporous silica for boosting the catalytic conversion of CO2 into cyclic carbonates".GREEN CHEMISTRY 20.14(2018).
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