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摘要本论文中，采用简单的水热合成法和热处理方法，通过简单调控反应物的配比，成功制备了α-MnO2/NixCo1-xOy壳核结构，并分析了这种材料作为催化剂对臭氧催化分解的影响。利用扫描电镜，X射线衍射法，透射电子显微镜和X射线光电子能谱分析这些表征手段测试了α-MnO2/NixCo1-xOy壳核结构材料的原料成分和形貌。结果表明：材料具有高分散性的多层核壳纳米结构，表面形貌均匀，孔隙结构丰富，获得了较大比表面积。进一步将制备出的材料用于臭氧的催化分解实验中，通过测试发现，当镍、钴比为0.75:0.25时，即X=0.75时，α-MnO2/NixCo1-xOy壳核结构的催化性能是最好的，当反应时间为15分钟，流速控制在20min/ml时，分解率达到了45%，加热后重复使用，仍能保持45%左右的催化效率。这说明样品作为催化剂不仅可以达到很好的催化效果，而且有良好的重复使用性，经济又环保。此类材料为催化剂材料的制备提供了新的设计思路和研究方法。70194
毕业论文关键词： MnO2纳米线；壳核异质结构；催化剂；α-MnO2/NixCo1-xOy
Abstract In this paper, using a simple hydrothermal method and heat treatment method, through a simple regulation of the ratio of reactants, α-MnO2/NixCo1-xOy core-shell structure were successfully prepared, and analyzed the influence of this material as a catalyst for catalytic decomposition of ozone. Scanning Electron Microscopy, X-ray diffraction, Transmission Electron Microscope and X-ray photoelectron spectroscopy were used to characterize the composition and morphology of the α-MnO2/NixCo1-xOy core-shell structure materials. The results show that the multilayer core-shell nanostructure with high dispersibility has uniform surface morphology, rich pore structure and large specific surface area. The prepared materials for catalytic ozone decomposition experiment, through the test found that when nickel and cobalt is 0.75:0.25, namely X=0.75, catalytic properties ofα-MnO2/NixCo1-xOy core-shell structure is the best, when the reaction time is 15 minutes, at a flow rate of 20min/ml, the decomposition rate reached 45%, repeated use after hearting, can still maintain the catalytic efficiency of about 45%. This shows that the sample can not only be used as catalyst, but also has good catalytic effect, good repetition, economic and environmental protection. These materials provide new design ideas and research methods for the preparation of catalyst materials.
Keywords: MnO2 nanometer; core-shell structure; catalyst; α-MnO2/NixCo1-xOy
目录
1绪论 1
1.1 臭氧 1
1.1.1 臭氧的研究现状 1
1.1.2 臭氧的危害 1
1.1.3 臭氧的消除及机理 1
1.2臭氧分解催化剂材料及研究发展 2
1.2.1 MnO2基材料 2
1.2.2 TiO2基异制结构材料