The Properties Of Photocatalytic SrFeO_3-x In Reduction Of HCO₃^- To CH₃OH

The exhaustion and the long-term use of fossil fuels brought out problems of carbon emissions and environmental pollution, which have become the chronic problems trapping the current economy. The key point lies in how to use the existing petrochemical energy efficiently and reduce carbon emissions. More than 60% of the carbon emissions come from automobile exhaustion of which effective control is the core of the solution. It is of high significance to collect the CO2 emissions and convert it into hydrocarbon fuels for automotive cycle-using under a closed circumstance.This paper involves that SrFeO3-x turn CO2’s secondary product HCO3 to methanol, of which the purpose is to explore photocatalytic issues of CO2 converting to hydrocarbon fuels in the sunlight or indoor lighting conditions. This enables energy recycling and mitigates environmental pollution and energy shortages. The first is the brief introduction about the status-quo and processing methods of CO2. The second reviewed photocatalytic CO2 to hydrocarbon fuel transfer system. The third studied photocatalytic HCO3 reaction system, designed and built a photocatalytic reaction and test system. The last made the SrFeO3.x and studied photocatalytic HCO3 to CH3OH. It contains the following three items:1. The nanometer perovskite type SrFeO3-x is prepared by mechanical alloying method and studied with microscopic properties(XRD, TEM) and thermal stability(DTA/TGA).2. Research the photocatalytic properties of SrFeO3-x turning HCO3 to others with fluorescent light illumination. Respectively, the catalytic efficiency was studied with the amount of the catalyst (0g,0.013g,0.025g,0.05g), concentration (0.01 mol/L, 0.02mol/L,0.05mol/L,0.1 mol/L,0.2mol/L,0.5mol/L,1 mol/L) and the reaction time (3h,6h,9h,12h). Simultaneously, compared with counterpart SrTiO3.3. The samples are tested by gas chromatography. The results show that the best catalytic rate is 8.934μmol/(gcat·h). The reaction conditions are 0.013g of SrFeO3-x 120h-milling powder,5mL of 0.1 M NaHCO3 solution,12 hours of reaction time with 40W-fluorescent at room temperature. A foreign research report showed Pt/NaNbO3 catalytic rate was 4.9 μmol/(gcat·h) with 300 W xenon lamp. The advantage of SrFeO3-x photocatalysis is the application of visible light, which laid the foundation for the future of converting CO2 into hydrocarbon fuel with natural light.