Catalysis Letters, Vol.149, No.8, 2089-2097, 2019
A Novel and Green In Situ Strategy for the Synthesis of Metallophthalocyanines on Chitosan and Investigation Their Catalytic Activity in the CO2 Fixation
In this work, a novel and green strategy for the in situ synthesis of metallophthalocyanines on chitosan (MPcs@CS; M=Cu, Ni, Co) in deep eutectic solvents (DESs) at 120 degrees C has been reported. The chemical and structural properties of the MPcs@CS were determined by scanning electron microscopy (SEM), energy-dispersive X-ray(EDS), X-ray powder diffraction (XRD), Fourier transformation infrared spectroscopy(FT-IR), thermogravimetric analysis(TGA) and flame atomic absorption spectroscopies(FAAS). This new MPcs@CS is a highly efficient, active and reusable catalyst for the synthesis of cyclic carbonates from promoting the reaction of CO2 with epoxides under mild reaction conditions (at 80 degrees C and 1atm CO2 pressure) with good to excellent yield of products. The order of catalytic activity is CuPc@CS, CoPc@CS and NiPc@CS from the conversion, temperature and time point of view, respectively. [GRAPHICS] .
Keywords:Chitosan;Metallophthalocyanine;CO2 fixation;Heterogeneous catalyst;Deep eutectic solvent;Cyclic carbonate