Design And Catalytic Performance Of Cerium-based Nanomaterials

In recent years,CeO₂nanomaterials have been widely used in many fields because of their unique physical and chemical structures and properties,and play an increasingly important role.CeO₂nanomaterials with different morphologies have different properties and different preparation methods.Different preparation methods have different advantages and disadvantages.Hydrothermal method is the most commonly used preparation method in the laboratory at present.With the application research of composite nano materials,more and more attention has been paid to CeO₂nano composite materials.The application of CeO₂nano composite materials has more practical value.In order to improve the application value of CeO₂nanomaterials,it is a hot topic in the synthesis,morphology control and application performance.In this paper,a variety of Ce based catalysts have been synthesized by hydrothermal method,and applied to a variety of catalytic reactions to study the influence of catalytic performance of Ce based catalysts.The specific research contents are as follows:?1?Using cerium nitrate as cerium source,nano CeO₂Catalysts with microsphere,rod,shuttle and cauliflower shapes were prepared by hydrothermal method.The catalyst was characterized and its photocatalytic performance was evaluated.The results show that the change of morphology is mainly influenced by morphology control agent and precipitant;The photocatalytic activity is related to the structure and surface area of the catalyst;The order of degradation rate of fuchsin base solution was cauliflower shape>rod shape>microsphere Shape>shuttle shape.?2?A series of spherical CeO₂/SiO₂composite oxides with different CeO₂/SiO₂mass ratios were prepared by co-precipitation method,and the catalytic performance of NH₃-SCR was evaluated.The results show that the structure of CeO₂/SiO₂with different proportion influences each other.When all the catalysts were at 350?,the no conversion reached the maximum.When the mass ratio of CeO₂/SiO₂is 0.5:1,CeO₂/SiO₂composite catalyst shows excellent NH₃-SCR catalytic performance.?3?Using CeO₂and CeO₂/SiO₂as carrier materials,Pt,Pd,Ru precious metal catalysts with different loadings were prepared by equal volume impregnation method,using fructose as raw material,DMSO as solvent,oxygen pressure 2MPa,160?After 4 hours of reaction,a one-pot one-step method using a precious metal catalyst catalyzes the synthesis of2,5-furandicarboxylic acid from fructose.The research results show that the yield of 2,5-furandicarboxylic acid synthesized by Ru-Ce catalyst with a loading of 0.3%is the best.Therefore,using fructose as the starting material to synthesize 2,5-furandicarboxylic acid,0.3wt%Ru-CeO₂catalyst should be selected for experiment.