脉冲电晕放电低温等离子体分解NH3的力学及机理研究

摘要

Chemical kinetics and mechanism of ammonia decomposition with pulsed corona discharge non-thermal plasma was studied.The treatment effects of ammonia-containing gas by the combination process of non-thermal plasma decomposition-water absorption were investigated.The experimental results showed that:The decomposition process was fitted by the pseudo first-order kinetics model with the equation of kt=ln (ρ0/ρt)=-ln (1-D),in which k=0.007 9P-0.190 3 (P≥ 24.08);Ammonia was removed by direct decomposition with high energy electrons or by reaction with intermediates to form NH4NO3 and NH4NO2;Not only water-soluble products,such as NH4NO3 and NH4NO2,could be removed by the combination process,but also water-soluble ammonia could be further decomposed with · OH generated by O3 in water.%探讨了脉冲电晕放电低温等离子体分解NH3的反应动力学及机理.采用比色法和离子色谱法分析了反应产物.考察了低温等离子体分解—水吸收联合工艺对含NH3气体的处理效果.实验结果表明:低温等离子体分解NH3符合准一级动力学经验模型kt=ln (ρ0/ρt)=-ln(1-D),其中k=0.007 9P-0.190 3 (P≥24.08);NH3的去除主要通过高能电子作用直接分解或与中间产物反应生成NH4NO3和NH4NO2两种方式;该联合工艺不仅可去除NH4NO3、NH4NO2等水溶性降解产物,同时臭氧遇水生成的·OH还可进一步分解水溶液中溶解性NH3.