新型光化学反应器及二氧化碳光解反应研究

研究设计了可产生波长小于200 nm真空紫外光的光化学反应器,首次利用该波段的光在该反应器中进行了CO2光解反应的研究。用氮气为发光介质对其进行光强标定,实验表明主要产生120、149、174 nm波长的光(N原子谱线);实验条件下CO2光解后生成产物CO,结果表明光源电流一定时产生CO的量与光源工作气体的压力有关,在CO2和N2反应物系中,光源内发光介质N2的压力在2 500 Pa左右时CO的产率最大,而在该反应物系中加入甲烷后,CO的产率明显增大。

Study on a new vacuum ultraviolet photochemical reactor and photodissociative reaction of carbon dioxide

A vacuum ultraviolet(VUV)photochemical reactor has been designed to produce a spectrum of mainly less than 200 nm in wavelength range.For the first time the carbon dioxide photodissociative reaction has been studied in the photochemical reactor.The atomic spectral intensity of the VUV light source was measured by a prior-calibrated VUV spectral detecting system with N_2 as luminescence gas.It was found the main atomic lines wavelengths were 120 nm,149 nm and 174 nm.The results showed that the carbon dioxide was photolyzed into CO and the yield depended on luminescence gas pressure of the VUV light source under constant electric current.The maximal CO yield was obtained under about 2.5 kPa of the luminescence gas pressure based on the carbon dioxide and N_2 system.After adding CH_4 into this system,CO yield was improved obviously while no maximal value of CO yield was found in the experiment.