摘要随着社会的发展，人们逐渐意识到环境保护的重要性，“温室效应”现象，已经引起人们的高度关注。但是能源短缺也是一个重要问题。这两者的本质就是碳的转化，我们可不可以将其形成一个可循环的系统或者体系。通过观察生活中植物的光合作用，发现植物可以利用太阳能和叶绿体，可以将二氧化碳转化为碳水化合物，从而实现碳的循环利用。理想状态下模拟植物的光合作用，在光照下，利用类似“叶绿体”的光催化剂将二氧化碳转化成碳氢燃料。从而实现既减少二氧化碳（CO2）的排放，又缓解能源减少现状的理想效果。

因此，此类光催化剂是打破现在这个恶性循环的关键。本文是对氧化铈（CeO2）/氧化铁（Fe2O3）纳米异质结作为催化剂催化二氧化碳催化制备相关清洁能源进行研究，也探讨了制备和选择催化剂方法方式。74681

铈离子迁移率、氧化铈与晶格氧能改变4价铈离子的相对稳定性，常被用作一种很好的添加剂氧化物催化剂。本文采用将铁元素掺杂到氧化铈和氧化铁的合成物中的溶胶凝胶法制备纳米粉体。对原本具有催化性能的催化进行特殊成分改性研究，通过掺杂金属离子掺入修饰， 使其改变了普通催化剂的内部结构，以便产生理想的光催化活性变化的效果。

通过XRD（X-射线衍射）、TEM（透射电子显微镜分析）、GC（气相色谱分析）等方法方式对催化剂的晶型，考察了孔径、比表面积、体相性质和催化效果。分析了催化剂结构与催化性能的关系。结果显示，掺入不同含量的铁元素，其催化性能和催化剂结构是不同的。

毕业论文关键字：CeO2；Fe2O3；异质结；还原二氧化碳

abstract With the developing of society, people have come to realize the importance of environmental protection, especially “greenhouse effect”, which has aroused great concern to the whole global。 But energy shortage is also another serious issue。 The essence of both is the transformation of carbon, and whether it can be a recyclable system of not。 Over the observation on photosynthesis of plant, we can found that the carbon recycling can be implemented by transformation from carbon dioxide into carbohydrate with the utilizing of solar and chloroplast for plants。 A simulated experiment, which should be effected by light-like catalysts as "chloroplasts" with lamp lighting, can convert carbon dioxide to hydrocarbon fuel in such ideal situations。 As a result, the ideal goal of decreasing the emission of Carbon dioxide and the remission of energy reduction over the simulated photosynthesis of planting has been achieved。

Thus, these type of photocatalyst is the key to breaking such vicious cycle。 The article is concentrated on researching catalyst cerium oxide/(FeO2) / iron oxide (Fe2O3) nano-heterojunction which is functioned on carbon dioxide to related clean fuels preparation。 Meanwhile, the choice of catalyst and the fuel preparation method is also mentioned。

Cerium ion is often used as an excellent catalyst for oxide catalysts because of its changing of relative stability for tetravalent cerium ions by its mobility, cerium oxide and lattice oxygen。 This paper is taking the method of sol-gel to prepare the nano-powder by mixing iron with the composition of cerium oxide and iron oxide。 Moreover, paper is covering the studying of modification of special element for catalyst with catalytic performance by adding metal ion to changing the common catalyst internal structure, hereby; the desired effect of light catalytic activity changing is achieved。。

By means of X-ray diffraction (XRD), transmission electron microscopy (TEM) and gas chromatography (GC), we are concentrating on the relevant acquaintance of catalyst crystal morphology pore size, specific surface area, bulk properties and catalytic effect。 And the relationship between the catalyst structure and the catalytic performance was also analyzed。 Given the above, the catalytic performance and catalyst structure is different by mixing different content of iron。