介质阻挡放电降解苯乙烯的研究

Studies on the obstruction of styrene degradation by dielectric barrier discharge.

研究了介质阻挡放电(DBD)常压下降解流动态苯乙烯时，不同电压、流速，初始浓度及湿度下苯乙烯的降解情况．结果表明，DBD降解苯乙烯15～20min即可达稳定，产物主要为CO、CO2和H2O；电压4800V时有少量带苯环的气态及固态物质产生，且随电压的升高而减少，到7500V时红外光谱已无法检测到；高电压下放电可以取得90％左右的降解率，产生带苯环的气态物质和结焦物质较少．流速在1．5cm／s，浓度为3000mg／m^3,相对湿度为20％左右时，降解效果最好．

The degradation state of styrene under different voltage, velocity of flow, original concentration and humidity was studied mainly when the dynamic styrene was degraded under general pressure of dielectric barrier discharge (DBD). The results showed that the degradation of styrene by DBD could be stable within 15~20min, and the main products were CO2, CO and H2O. Little amounts of gas and solid matter with phenyl were produced under the voltage of 4800V and these amount decreased with increasing of the voltage. At the voltage of 7500V, no matter was found in FT-IR spectra. Under high voltage, the discharge state was better with the degradation rate up to about 90%; and the produced matter with phenyl and coked matter were less. The degradation efficiency was the best with velocity of flow at 1.5cm/s, concentration of 3000mg/m3 and relative humidity of 20%.