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Tunable imidazolium ionic liquids as efficient catalysts for conversion of urea into cyclic carbonates
Deng, Lili1,2; Su, Qian2,5; Tan, Xin2; Wang, Yichao2,4; Dong, Li2,5; He, Hongyan2,3; Li, Zengxi1,2; Cheng, Weiguo2,5
2022-02-01
Source PublicationMOLECULAR CATALYSIS
ISSN2468-8231
Volume519Pages:11
AbstractSynthesis of cyclic carbonates from cheap and reusable urea is of great importance, but it is still an immense challenge to obtain highly efficient catalysts using relatively less metal-containing catalysts for this route due to conventional metal salt catalysts with established structure. Herein, a series of eco-friendly ionic liquids (ILs) with different cationic structures were adopted as efficient catalysts for the reaction of urea alcoholysis. By regulating the cation chain lengths, different lewis acid centers of imidazolium-based ILs with chain lengths from C-2 to C-16 were constructed. The IL with a moderate side chain (OmimCl/ZnCl2) exhibited better catalytic performance and the yield of ethylene carbonate (EC) could reach 96% percent with less metal-containing catalyst at lower diols/urea molar ratio conditions. Through exploring the structure-activity relationships of cationic structure and anionic speciation, it was illustrated that the inductive effect of cation in ILs had important influences on the synthesis of [Zn2Cl5]-. Additionally, the appearance of the [Zn2Cl5]-, which has been proved with pyridine spectroscopic could strengthen the lewis acidity of ILs to obtain high catalytic activity, this could avoid excessive metal-containing in ILs. Based on the experimental results and DFT calculations, an IL anion cation synergistic catalytic mechanism has been proposed. Thus, the use of ILs opens up a new green avenue and provides a preliminary basis of CO2 utilization.
KeywordIonic liquids Urea alcoholysis Anionic speciation Synergistic catalysis
DOI10.1016/j.mcat.2022.112153
Language英语
WOS KeywordPROPYLENE CARBONATE ; DIMETHYL CARBONATE ; ETHYLENE-GLYCOL ; OXIDATIVE DESULFURIZATION ; GLYCEROL CARBONATE ; OXIDE ; TRANSESTERIFICATION ; CYCLOHEXENE ; PERFORMANCE ; SPECIATION
Funding ProjectMajor Program of National Natural Science Foundation of China[21890762] ; National Natural Science Foundation of China[22078329] ; National Natural Science Foundation of China[22178338] ; National Natural Science Foundation of China[21890763] ; National Natural Science Foundation of China[21908226] ; National Natural Science Foundation of China[22008242] ; National Natural Science Foundation of China[21922813] ; National Key R&D Program of China[2020YFA0710204] ; DNL Cooperation Fund, CAS[DNL180202] ; "Transformational Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences[XDA 21030500] ; Guangdong Provincial Key Research and Development Program[2020B0101370002]
WOS Research AreaChemistry
WOS SubjectChemistry, Physical
Funding OrganizationMajor Program of National Natural Science Foundation of China ; National Natural Science Foundation of China ; National Key R&D Program of China ; DNL Cooperation Fund, CAS ; "Transformational Technologies for Clean Energy and Demonstration", Strategic Priority Research Program of the Chinese Academy of Sciences ; Guangdong Provincial Key Research and Development Program
WOS IDWOS:000783581300001
PublisherELSEVIER
Citation statistics
Document Type期刊论文
Identifierhttp://ir.ipe.ac.cn/handle/122111/52849
Collection中国科学院过程工程研究所
Corresponding AuthorLi, Zengxi; Cheng, Weiguo
Affiliation1.Univ Chinese Acad Sci, Sch Chem Sci, Beijing 100049, Peoples R China
2.Chinese Acad Sci, Inst Proc Engn, Beijing Key Lab Ion Liquids Clean Proc, CAS Key Lab Green Proc & Engn, Beijing 100190, Peoples R China
3.Dalian Natl Lab Clean Energy, Dalian 116023, Liaoning, Peoples R China
4.Zhengzhou Univ, Sch Chem Engn, Zhengzhou 450001, Peoples R China
5.Adv Energy Sci & Technol Guangdong Lab, Huizhou 516003, Peoples R China
Recommended Citation
GB/T 7714
Deng, Lili,Su, Qian,Tan, Xin,et al. Tunable imidazolium ionic liquids as efficient catalysts for conversion of urea into cyclic carbonates[J]. MOLECULAR CATALYSIS,2022,519:11.
APA Deng, Lili.,Su, Qian.,Tan, Xin.,Wang, Yichao.,Dong, Li.,...&Cheng, Weiguo.(2022).Tunable imidazolium ionic liquids as efficient catalysts for conversion of urea into cyclic carbonates.MOLECULAR CATALYSIS,519,11.
MLA Deng, Lili,et al."Tunable imidazolium ionic liquids as efficient catalysts for conversion of urea into cyclic carbonates".MOLECULAR CATALYSIS 519(2022):11.
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