Chinese Journal of Catalysis ›› 2024, Vol. 66: 152-167.DOI: 10.1016/S1872-2067(24)60117-8

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Constructing mesoporous CeO2 single-crystal particles in ionic liquids for enhancing the conversion of CO2 and alcohols to carbonates

Jielin Huanga,b, Jie Wanga,b, Haonan Duanb, Songsong Chena,b, Junping Zhangb,c, Li Dongb,c,*(), Xiangping Zhangb,*()   

  1. aSchool of Chemical Engineering, University of Chinese Academy of Sciences, Beijing 100049, China
    bBeijing Key Laboratory of Ionic Liquids Clean Process, CAS Key Laboratory of Green Process and Engineering, State Key Laboratory of Mesoscience and Engineering, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
    cLongzihu New Energy Laboratory, Zhengzhou Institute of Emerging Industrial Technology, Henan University, Zhengzhou 450000, Henan, China
  • Received:2024-05-10 Accepted:2024-08-12 Online:2024-11-18 Published:2024-11-10
  • Contact: *E-mail: ldong@ipe.ac.cn (L. Dong),xpzhang@ipe.ac.cn (X. Zhang).
  • Supported by:
    Clean Combustion and Low-carbon Utilization of Coal, Strategic Priority Research Program of the Chinese Academy of Sciences(XDA29030202);National Natural Science Foundation of China(22178356);Key-Area Research and Development Program of Guangdong Province(2020B0101370002)

Abstract:

Catalysts for CO2 value-added conversion have been extensively explored, but there is still a lack of systematic design for catalysts that achieve efficient CO2 conversion under mild conditions. Herein, we explored a mesoporous CeO2 single-crystal formed with the regulation of ionic liquids, which catalyzed the effective carbonylation reaction with CO2 under mild reaction conditions. By altering the synthetic environment, a series of uniform mesoporous CeO2 particles with atomically aligned single-crystal frameworks were constructed, which have different surface physicochemical properties and primary aggregation degree. The prepared mesoporous CeO2 single-crystal achieved efficient activation of CO2 and alcohols at 0.5 MPa CO2 and 100 °C, and the CeO2-IL-M catalyst shows optimal catalytic performance in the synthesis of ethylene carbonate with 46.22 mmol g-1 h-1, which was 50.6 times as high as that of the CeO2 obtained without ionic liquids. Subsequently, the catalytic pathway and mechanism of carbonylation reaction with CO2 on mesoporous CeO2 single-crystal were studied via React-IR spectra and C18O2 labeling experiments. The research provides a new strategy for controllable nanoscale assembly of mesoporous single-crystal materials and expands the application range of single-crystal materials, aiming to develop novel catalytic materials to meet industrial needs.

Key words: Cerium dioxide, Ionic liquid, Single-crystal material, Surface oxygen vacancy, Carbonylation reaction