摘要
利用介质阻挡放电产生低温等离子体转化C3H6/NO/N2气氛中NO,结合发射光谱诊断法研究了碳氢化合物C3H6对NO转化的影响。研究结果表明,随着放电功率的升高,NO转化率先升高后逐渐趋于平缓,NO2浓度持续降低,N2O浓度呈先升高后降低趋势,NO主要被还原为N2;相同放电功率下,随着C3H6初始浓度升高,NOx转化率和N2O浓度升高、NO2浓度降低;添加C3H6会降低N2第二正带系和NO-γ带的发射光谱强度,产生CN自由基的激发跃迁谱线,影响NO的化学反应机制,同时生成了棕黄色的聚合物。
The low temperature plasma i.e. non-thermal plasma （NTP） produced by dielectric barrier discharge was employed to decompose NOx in C3H6/NO/N2 mixture. How to make this process higher conversion efficiency with lower energy cost is a topic of the present study. In order to study the effect of hydrocarbon on NO conversion in diesel exhaust, in experimental study C3H6/NO/N2 mixture was treated by NTP and an optical emission spectroscopy diagnosis technology adopted to obtain the information about radicals and excimer in the discharge space produced by NTP. The results indicate that with increase of discharge power, NO conversion efficiency increases sharply first and then slows down to a constant value, and NO2 concentration gradually decreases while N2O concentration grows up first and then goes down. NO in the mixture is mainly reduced to N2. At the same discharge power, with increase of C3H6 initial concentration NOx conversion efficiency and N20 concentration increases while NOz concentration decreases. The addition of C3H6 can make the spectral intensity of NO-7 band and N2 second positive band decreases, while do CN radical to stimulate the transition spectral line, which can affect NO conversion mechanism, and so the formation of yellow polymer.
出处
《化工学报》
EI
CAS
CSCD
北大核心
2014年第3期1056-1061,共6页
CIESC Journal
基金
国家自然科学基金项目(51176067)
教育部博士点基金(20103227110014)
江苏省自然科学基金项目(BK2010330)
江苏省高校优势学科建设工程项目~~
