脉冲电晕放电低温等离子体分解NH_3的动力学及机理研究

Chemical kinetics and mechanism of ammonia decomposition with pulsed corona discharge non-thermal plasma

探讨了脉冲电晕放电低温等离子体分解NH_3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NH_3气体的处理效果。实验结果表明:低温等离子体分解NH_3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);NH_3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NH_4NO_3和NH_4NO_2两种方式;该联合工艺不仅可去除NH_4NO_3、NH_4NO_2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NH_3。

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.