真空紫外線によるCO₂光還元法

抄録

It has been reported that CO₂ accounts for approximately 76% of the greenhouse gases responsible for climate change. To reduce CO₂ emissions, the development of CCU technology has been actively pursued. We have developed a new method of CO₂ decomposition by vacuum ultraviolet ray (VUV). An excimer lamp capable of emitting a single wavelength of VUV is installed in a VUV photoreactor, and a unique chemical reaction occurs when the VUV is irradiated onto the target gas. In this report, the CO₂ decomposition characteristics of VUV irradiation were investigated for the CO₂/N₂ system; a maximum CO₂ decomposition rate of 3.33 % was obtained in the CO₂/N₂ system using VUV at 172 nm, with an inlet CO₂ concentration of 100 % and a gas residence time of 1020 seconds. The CO₂ decomposition rate increased with increasing residence time and initial CO₂ conc., indicating that the CO₂ decomposition behavior changed depending on the VUV wavelength. The maximum CO₂ decomposition rate by VUV at 146 nm was 3.23%.