Plasma Chemistry and Plasma Processing

, Volume 19, Issue 3, pp 421–443

Oxidation and Reduction Processes During NOx Removal with Corona-Induced Nonthermal Plasma

Authors

  • K. Yan
    • Department of Electrical and Electronic EngineeringOita University
    • Department of Applied PhysicsBeijing Institute of Technology
  • S. Kanazawa
    • Department of Electrical and Electronic EngineeringOita University
  • T. Ohkubo
    • Department of Electrical and Electronic EngineeringOita University
  • Y. Nomoto
    • Department of Electrical and Electronic EngineeringOita University
Article

DOI: 10.1023/A:1021824504271

Cite this article as:
Yan, K., Kanazawa, S., Ohkubo, T. et al. Plasma Chemistry and Plasma Processing (1999) 19: 421. doi:10.1023/A:1021824504271

Abstract

In this paper, the NO-to-NO2conversion in various gaseous mixtures is experimentally investigated. Streamer coronas are produced with a dc-superimposed high-frequency ac power supply (10–60 kHz). According to NOxremoval experiments in N2+NOxand N2+O2+NOxgaseous mixtures, it is supposed that the reverse reaction NO2+O→NO+O2may not only limit NO2production in N2+NOxmixtures, but also increase the energy cost for NO removal. Oxygen could significantly suppress reduction reactions and enhance oxidation processes. The reduction reactions, such as N+NO→N2+O, induce negligible NO removal provided the O2concentration is larger than 3.6%. With adding H2O into the reactor, the produced NO2per unit removed NO can be significantly reduced due to NO2oxidation. NH3injection could also significantly decrease the produced NO2via NH and NH2- related reduction reactions. Almost 100% of NO2can be removed in gaseous mixtures of N2+O2+H2O+NO2with negligible NO production.

Streamer coronaNOx removalnonthermal plasmaoxidationreduction

Copyright information

© Plenum Publishing Corporation 1999