925银电极上同步电化学还原NO2-与CO2合成尿素

引言煤炭、石油等化石燃料燃烧的同时会产生大量氮氧化物(NOx)和二氧化碳(CO2),导致地球的生态系统遭受严重破坏1]。NOx是导致酸雨、光化学烟雾的主要污染物,而CO2是主要的温室气体。目前国内外使用比较广泛的NOx废气处理方法可分为干法和湿法两大类,其中干法可以分为选择性催

Electrochemical synthesis of urea by simultaneous reduction of nitrite and carbon dioxide at 925 Ag electrode

The electrochemical synthesis of urea by simultaneous reduction of nitrite and CO₂ was performed in 0.02 mol·L^-1 NaNO₂ and 0.2 mol·L^-1 NaHCO₃ aqueous solutions at 925 Ag electrode in laboratory-scale experiments.The effect of several parameters, including electrolysis potential, temperature, and CO₂ pressure, on urea formation was investigated.At the temperature of 293 K,CO₂ pressure of 0.7 MPa, the electrolytic potential of -0.6 V, the current efficiency of urea formation reached 37%.Under the conditions of temperature of 273 K and electrolytic potential of -1.7 V, the current efficiency reached 26% under normal ambient pressure.Based on the relationship of current efficiency and formation of CO, NH₃ and urea, a tentative reaction pathway was proposed.