Core-Shell ZIF-67@CeO2 Nanosphere as Efficient Acid-Base Catalyst for the Cycloaddition of CO2 and Epoxides

作者：Hu, Lihua; Mo, Xiaohong; Chen, Li; Wu, Yuehang; Liu, Feng; Yin, Kangling; Fan, Taotao; Yan, Zongcheng^*

来源：ChemistrySelect, 2022, 7(20): e202200823.

DOI：10.1002/slct.202200823

• Metal-organic frameworks
• Acidity
• Carbon dioxide fixation

Controllable deposition of nanosphere with zeolitic imidazolate frameworks (ZIFs) is an efficient method to achieve unique properties and create new types of multifunctional ZIF core-shell materials with enhanced properties. Core-shell ZIF-67@CeO2 nanosphere was designed with ZIF-67 nanoparticles as seed for the deposition of CeO2 nanocrystals. The as-prepared ZIF-67@CeO2 nanosphere can catalyze CO2 cycloaddition reaction with significant activity. The synergistic acid-base catalytic sites of ZIF-67@CeO2 nanosphere were investigated through TPD analysis. These sites can effectively coordinate and activate the substrate molecules, thereby enhancing catalytic efficiency for CO2 cycloaddition reaction. The ZIF-67@CeO2 nanosphere showed almost 100.00 % conversion of styrene oxide and 100.00 % selectivity of desired cyclic carbonate (120 degrees C, 7.5 bar, and 8 h). In addition, ZIF-67@CeO2 showed a negligible decrease in the catalytic activity even after being reused for four cycles.

• 单位
  广西大学