Preparation Of Novel Nanocopper-load Composite Nanofibers And Their Applications In Catalyzing The Reaction Of Diphenyl Ether Synthesis

Due to their outstanding photics, electricity, catalysis, biology and mechanicalproperties, similar quality to noble metal nanopaticles, unique advantage in low-cost andlarge-tonnage, copper nanoparticles would be widely used in many fields.In this article，Cu/PAN nanofibers and Cu/CNFs were prepared by electropinningprocess, high-pressure hydrogenation method and calcination process, then compositenanofibers containing copper nanoparticles were used as catalysts for Ullmann typereaction for synthesis of diphenyl ether, major studies shown as follows.1. Cu/PAN nanofibers containing copper nanoparticles were prepared by combiningelectrospinning process with high-pressure hydrogenation method. Cu/PAN nanofiberswere finally characterized using scanning electron microscopy (SEM), energy dispersivespectroscopy (EDS), transmission electron microscope (TEM), Fourier transform infraredspectrum (FT-IR) and X-ray photoelectron spectroscopy (XPS). Results indicate that,copper nanoparticles prepared by high-pressure hydrogenation method could besmall-sized and well-dispersed on/in PAN nanofibers, on the other hand, the mainchemistry structure of PAN nanofiber itself was not influenced by high-pressurehydrogenation process, and the PAN nanofibers were used as stabilizing agent andcapping agent. Cu/PAN nanofibers with different molar ratio were used as catalysts forUllman type reaction, recycling capacity of catalysts were evaluated at the same time. Theresults of reactions showed that, Cu/PAN nanofibers with molar ratio is1/10were themost suitable catalyst for the reaction, the conversation for iodobenzene was89.32%, andthe selectivity of diphenyl ether was32.86%, and the catalyst was well recycled.2. Cu/CNFs were prepared by combination of electrospinning method, high-pressuremethod and calcine process. Cu/CNFs were characterized by a series of experimentalinstruments. The results showed that, copper nanoparticles with small size were welldispersed on/in the graphite network layers. The Cu/CNFs were finally used as catalystsfor Ullmann type reaction. Results showed that, Cu/CNFs with molar ratio is1/10werethe most suitable catalyst for the reaction, the conversation for iodobenzene was97.39%,and the selectivity of diphenyl ether was38.05%, and the catalyst was well recycled.The researching works of this paper would approach a novel method and a new idea for preparing copper nanoparticles catalysts, and on the other hand, this research wouldgive particular applications of composite nanofibers in the field of catalysis.