The Activity And CO₂ Absorption Decomposition Rule Of Iron Oxide Affected By Preparation Technology

At the present time,with the increment of the greenhouse gases,the greenhouse effect brings lots of environment problems to the world.For reducing the extra carbon dioxide,the most effective method is to convert carbon dioxide to other resources,such as water gas,and methyl alcohol.However,because of the stability,the carbon dioxide is not easy to be decomposed.Therefore,the primary problem of utilizing carbon dioxide is the absorption and activation.The active metallic oxide is good at absorbing and activating CO₂.According to this research,by hydrogen reduction,the Fe₂O₃ and Fe3O4 powders will be activated and produce the oxygen vacancy.And these powders can absorb and activate the carbon dioxide.Different temperature of the hydrogen reduction can affect the effect of the reaction between CO₂ and Fe₂O₃ and Fe3O4 powders.With the increment of the temperature of hydrogen reduction,parts of Fe₂O₃ and Fe3O4 powders will be converted to the ?-Fe.By reacting with carbon dioxide,these powders can reduce the pressure of the CO₂.From the analysis of thermodynamic,stoichiometric Fe₂O₃ and Fe3O4 cannot decompose CO₂.However,the oxygen vacancy and the activated ?-Fe promote the reaction by reducing the activation energy of reactions from thermodynamics.Therefore,adsorption and decomposition of CO₂ are produced by both oxygen vacancy and the activated ?-Fe.By magnetron sputtering,the iron oxide film was produced on the monocrystalline silicon piece.Through 320? hydrogen reduction and reacting with CO₂,the contact angle of the iron oxide film changed,showing the ability of the sputtered film to decompose CO₂ gas.