Rich −NH2 Mesoporous g‐C3N4 Nanosheets Efficient for Cycloaddition of CO2 to Epoxides without Solvent and Co‐Catalyst. Issue 15 (21st April 2021)

• Record Type: Journal Article
• Authors: Wang, Hefang; Liu, Guanghui; Hao, Xiaojun; Li, Manhua; Yang, Lijia; Sun, Peidong; Zhang, Huixin
• Is Part Of: ChemistrySelect. Volume 6:Issue 15(2021)
• Page Start: 3712
• Page End: 3721
• Publication Date: 2021-04-21
• Subjects: cycloaddition -- graphitic carbon nitride -- heterogeneous catalysis -- nanostructures -- rich −NH2 groups -- thermal exfoliation; Chemistry -- Periodicals; 540.5
• DOI: 10.1002/slct.202100308
• Languages: English
• ISSNs: 2365-6549

Abstract

Abstract: Graphitic carbon nitride (g‐C3 N4 ) with N‐containing groups is an attractive catalyst for various CO2 ‐activating reactions. Herein, a rich −NH2 mesoporous g‐C3 N4 nanosheets catalyst was successfully prepared by thermal exfoliation from bulk g‐C3 N4 with porous structure using urea and melamine as precursors. With urea as precursor and bubble template, the nanosheets after thermal exfoliation showed large surface area (236.4 m 2 g −1 ), rich mesopores and −NH2 groups, which are base sites of cycloaddition of CO2 to epoxides. The obtained catalyst showed high catalytic performance for CO2 cycloaddition without solvent and co‐catalyst. Propylene oxide (PO) and CO2 cycloaddition to propylene carbonate (PC) was used as probe reaction to evaluate the catalytic performance. Under the optimal reaction conditions (130 °C, 2.5 MPa, 20 h), the conversion of PO was 97.8 % and selectivity to PC was 98.1 %. In addition, the obtained catalyst showed good suitability for various substrates in CO2 cycloaddition and stability. Abstract : A rich −NH2 mesoporous g‐C3 N4 nanosheet catalyst was successfully prepared by thermal exfoliation from bulk porous g‐C3 N4 using urea and melamine as precursors. The obtained nanosheets with large surface area, rich mesopores and −NH2 groups showed high catalytic performance for CO2 cycloaddition without solvent and co‐catalyst.