Experimental study on the characteristics of NO oxidation-reduction by using dielectric barrier discharge plasma

摘要

The NO reduction and NO oxidation are two main NO removal pathways in the process of NO removal by using non-thermal plasma. Being the product of NO reduction, N_2 needs no more dealing with and this means the NO reduction pathway can simplify and shorten the NO removal process. The NO removal experimental system by using the dielectric barrier discharge plasma was established, and the effects of some factors including some electrical parameters on these two NO removal pathways were obtained and discussed. The experimental results show that the process of NO reduction will be suppressed and that of NO oxidation will then be enhanced while increasing O_2 concentration in N_2/NO/O_2 plasma system; that NO will be almost entirely removed through the NO reduction pathway other than the NO oxidation pathway in N_2/NO system without O_2 even if the NO initial concentration is increased; that the both pathways will be suppressed while increasing the discharge electric voltage in N_2/NO/O_2 system with a fixed O_2 concentration; that the NO removal efficiency will be increased at first and then be decreased while increasing the discharge frequency in N_2/NO/O_2 system with a fixed O_2 concentration.