Investigate Selective Catalytic Oxidation Of Ag₂O/SiO₂ Complex Nanocatalsts Prepared By Atomizing-combustion Method

The objective of this disquisition is to synthesize Ag2O/SiO₂ complex nanocatalysts by Atomizing-combustion method and investigate their use in transforming gaseous cyclohexane into cyclohexane or oxide cyclohexene by selective catalytic oxidation. The target reaction was systemtically researched in preparation catalyst, activation catalyst, characterization catalyst and tests for catalyst preparation methods, the component of catalysts and the conditions of catalysis reactions.Atomizing-combustion method is a new technology for synthesis complex nanocatalysts. For the value of the research of method, the nanocatalysts were characterized by Differential Scanning Calorimetry-Thermogravimetry (DSC-TG), X-ray Diffraction (XRD), Transmission Electron Microscope(TEM) and Fourier transform infrared (FT-IR). The results showed that the nanocatalysts were prepared by super-high reaction base-liquid had stronger ability of oxide cyclohexene than the nanocatalysts were prepared by normal reaction base-liquid. The surface structure model of nanocatalysts was deduced from these characterization facts. Based on the surface structure model of nanocatalysts, the active sites suffering active oxygen of the complex nanocatalysts surface were analyzed. The variation rule was deduced that the offering active oxygen abilities of nanocatalysts increase in nonlincarity with the decrease of nanocatalyst content.The results of catalytic activity tests showed that the supplying oxygen and dehydrogenation of nanocatalysts prepared by normal consistency reaction liquid was very strong; and the epoxidation composite of nanocatalysts prepared by high consistency reaction liquid was very strong.