Generation of Strong Basic Sites on Polyacrylonitrile Fiber as Catalysts for Oxidation of Methylene Compounds.

Heterogeneous solid base catalysts have attracted widespread attention for various reactions from the perspective of green and economy chemistry due to their advantages such as low corrosiveness, high reaction efficiency, and easy separation. The unique properties of polyacrylonitrile fibers (PANF) such as good mechanical strength and a surface rich in cyanine and economy make them suitable catalytic supports. Herein, potassium oxide was introduced into PANF by redox strategy. Characterization using XRD, FT-IR, solid-state 13C NMR, XPS, SEM, CO2-TPD, etc. confirmed the successful preparation of this heterogeneous base catalyst and the participation of PANF in the redox process of KNO3 to promote the decomposition of KNO3. The acquired catalyst showed obvious activity for the oxidation of methylene compounds and the yield of fluorenones can reach 100% at 100 °C. This strategy provides a new development path for the application of PANF and the synthesis of heterogeneous bases. [ABSTRACT FROM AUTHOR]