Preparation of Bifunctional Metal-organic Framework Materials and Application in Catalytic Olefins Epoxidation

Metal organic framework materials(MOFs) are coordination polymers formed by coordination. Recent studies have found that MOFs are the kind of heterogeneous catalysts with excellent catalytic performance due to their stable active sites in many reactions. In this paper,the ZnCo-MOF bimetallic catalyst material were prepared by the synthetic method of rotational hydrothermal crystallization using ZnO as the zinc source. X-ray diffraction(XRD), Fourier transform infrared spectrum(FTIR),scanning electron microscopy(SEM)and X-ray photoelectron spectro- scopy(XPS)were used to represent the morphology,structure and composition of the catalyst. The prepared catalyst can obtain epoxide with high conversion and high selectivity without adding any initiator or co-reducing agent in the air epoxidation reaction of catalyzed diolefin by microwave heating. The ZnCo-MOF catalyst synthesized by rotational hydrothermal method(110 r/min)has the best activity in the catalytic epoxidation of alpha-pinene and alpha-methylstyrene, which can obtain 86.3% and 99.8%(molar fraction)conversion,respectively,and the selectivity of the correspon- ding epoxides reach 93.8% and 94.3%.