Research Of Nano-catalysts Materials: Design, Preparation And Application

Nano-catalyst, which showed highly efficient the reduction or oxidation properties, was widely used in the catalysis or photocatalysis areas. Compared to the commercial catalyst, nano-catalyst possessed higher activity, selectivity, and more excellent catalytic performance. The partical size, mophology and surface properties of the nano-catalyst played the key role of the activity and selectivity. The properties of the nano-catalyst were affected by the preparation conditions, such as regant concentration, duration time, temperature, solvent ratio, surfactant, etc. Recently, lots of reasearch work on the preparation and application of nano-catalyst has been reported. However, the applications of nano-catalyst are still a challenge to the scientists.Herein we report on the synthesis of nano-ZnO and Cu catalysts with controllable particle size, morphology and surface properites through a simple green, cheap and easy for industrial way. The surface modifications to the nano-ZnO and Cu catalysts were researched separatly in order to design an optimized catalyst structure.The main content and innovations are summarized as follows. 1,Nano-ZnO with different morphologies and particle sizes can be successfully synthesized using a simple hydrothermal method. The effects of the reagent concentration, hydrothermal temperaure, duration time, slurry pH value and solvents ratio to the nano-ZnO morphologies and particle sizes were studied. Sphere-like, rod-like and flower-like nano-ZnO catalysts were obtained by changing the different hydrothermal reagents. The morphologies and particle sizes of the photocatalysts could be contralable synthesized by adjusting the reagents concentration, hydrothermal temperaure, duration time, slurry pH value and solvents ratio. This simple preparation method with the inexpensive raw materials is easy to control which could be potential enlarged in industry.2,The photocatalytic activities of differenct samples in the water solution were researched using Rhodamine B as the degradation target. The effects of products morphology, partical size, surface modification and system conditions to the photocatalytic properties were also studied. The optimized method for increase the photocatalytic efficiency was found. The results showed that as-prepared nano-ZnO catalysts all posessed good photocatalytic properties. Decreasing of particle size, increasing of specific surface area and low temperatur calcining will lead to the increase of the photocatalytic properties. The degradation speed of the whole photocatalytic system will be increaed by adjusting the concentration of the catalysts and the pH value of the slurry. 3,Novel nano core/shell strctured ZnO@SiO2 and ZnO@@SiO2 photocatalytic particles were successfully designed and synthesized. The photocatalytic propereties were researched. The results showed that the core/shell strctured ZnO@SiO2 and ZnO@@SiO2 photocatalytic particles have potential application in catalysts area, which proved the advantage in the photocatalytic application area and the correctness of our design.4,Nano Cu catalysts can be successfully synthesized using liquid phase reduction method. The effects of the reagents concentration, system temperature, duration time, solvents ratio and surfactants to the Cu particles were studied in our research work. The well-dispersed nano Cu catalyst particles with contralable mophology and particle size can be obtained by the simple method, which could be potential, applied in industry area.5,A novel nano core/shell strctured Cu@C photocatalytic particles were successfully designed and synthesized. The photocatalytic propereties were reseached. The results showed that the core/shell strctured Cu@C photocatalytic particles have potential application in catalysts area, which proved the advatage in the Benzene hydroxylation catalytic application area and the correctness of our design.6,Based on the lab-preparations of the two kinds of catalysts, the whole synthesis systems were enlarged throughout tube-in-tube microreactor and the rotating packed bed combining with liquid phase reduction method. The tube-in-tube microreactor and the rotating packed bed can significantly improve the dispersity of the particles.