Structure Design And Performance Control Of Nickel And Iron Based Photothermal Catalysts For Fischer-Tropsch Synthesis To Light Olefins

Energy issue has been a worldwide concerning problem for a long time.Sharp decrease of fossil resource recent years contributes to energy crisis.Environment pollution aggravation is also attributed to large scale utilization of fossil resource.Thereby,utilization of novel energy resources or exploration of new technic with low cost and pollution draw great attention.Light olefin,produced through traditional thermal catalysis pathway under high temperature and pressure,is widely used and highly regarded as an important chemical feedstock.Traditional production method causes giant assumption of energy resources and aggravation of environment pollution.Concerning about the great reserve of coal in China,exploitation of novel solar utilization technic and conversion of coal into light olefins are of great significance.Due to unique two-dimensional structure of layered double hydroxide and high dispersion of supported metal catalysts,both are promising in catalysis field.Thus,dominant research in this paper are as follows:NiMn-precursor and NiMn-LDH were both synthesized by co-precipitated double drop method and subsequently controllably reduced to Ni/MnO catalysts.Structure of catalysts were characterized by XRD,TEM,XAFS and so on.The enrichment of electron occurred on metallic Ni supported on MnO was shown subsequently.Combined with DTF calculation,the unsaturated hydrocarbons intermediate products were easier to desorbed from catalysts which contributed to higher selectivity of light olefins.ZnFe-LDH was synthesized by double drop method and subsequently controllably reduced to Fe/ZnO heterostructure catalysts,and Fe₂O₃ with various morphology were synthesized by hydrothermal method.Structure of catalysts were characterized by XRD,TEM,XAFS and so on,which proved the heterostructure catalysts was capable of activating CO,and the morphology of Fe₂O₃ influenced the activity of CO hydrogenation.