Korean Journal of Chemical Engineering

, Volume 21, Issue 5, pp 976–982 | Cite as

Reduction of nitrogen oxides by ozonization-catalysis hybrid process

  • Young Sun Mok
  • In-Sik Nam


Treatment of nitrogen oxides (NOx) by using a hybrid process consisting of ozonization and catalysis was investigated. The ozonization method may be an alternative for the oxidation of NO to NO2. It was found that nitric oxide (NO) was easily oxidized to nitrogen dioxide (NO2) in the ozonization chamber without using any hydrocarbon additive. In a temperature range of 443 to 503 K, the decomposition of ozone into molecular oxygen was not significant, and one mole of ozone approximately reacted with one mole of NO. A kinetic study revealed that the oxidation of NO to NO2 by ozone was very fast, almost completed in a few tens of milliseconds. When the amount of ozone added was less than stoichiometric ratio with respect to the initial concentration of NO, negligible NO3 and N2O5 were formed. The oxidation of a part of NO to NO2 in the ozonization chamber enhanced the selective reduction of NOx to N2 by a catalyst (V2O5/TiO2), indicating that the mixture of NO and NO2 reacts faster than NO.

Key words

Nitrogen Oxides Ozonization Catalysis Hybrid Process 


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  1. Bröer, S. and Hammer, T., “Selective Catalytic Reduction of Nitrogen Oxides by Combining a Non-Thermal Plasma and a V2O5-WO3/TiO2 Catalyst,”Appl. Catal. B: Environ.,28, 101 (2000).CrossRefGoogle Scholar
  2. Choo, S. T., Nam, I.-S., Ham, S. W. and Lee, J. B., “Effect of Calcination Temperature on the Characteristics of SO4 2-/TiO2 Catalysts for the Reduction of NO by NH3,”Korean J. Chem. Eng.,20, 273 (2003).CrossRefGoogle Scholar
  3. Hoard, J., “Plasma-Catalysis for Diesel Exhaust Treatment: Current State of Art,”Society of Automotive Engineers Technical Paper series, Paper number 01FL-63 (2001).Google Scholar
  4. Kim, B. S., Lee, S. H., Park, Y. T., Ham, S. W., Chae, H. J. and Nam, I.-S., “Selective Catalytic Reduction of NOx by Propene over Copper-Exchanged Pillared Clays,”Korean J. Chem. Eng.,18, 704 (2001).CrossRefGoogle Scholar
  5. Koebel, M. and Elsener, M., “Selective Catalytic Reduction of NO over Commercial DeNOx-Catalysts: Experimental Determination of Kinetic and Thermodynamic Parameters,”Chem. Eng. Sci.,53, 657 (1998).CrossRefGoogle Scholar
  6. Koebel, M., Elsener, M. and Kleemann, M., “Urea-SCR: A Promising Technique, to Reduce NOx Emissions from Automotive Diesel Engines,”Catal. Today,59, 335 (2000).CrossRefGoogle Scholar
  7. Kogelschatz, U., “Advanced Ozone Generation,” Process Technologies for Water Treatment, Plenum Press, New York, 87 (1988).Google Scholar
  8. Kogelschatz, U., “Dielectric Barrier Discharges: Their History, Discharge Physics, and Industrial Applications,”Plasma Chem. Plasma Proc.,23(1), 1 (2003).CrossRefGoogle Scholar
  9. Lee, H. T. and Rhee, H. K., “Steam Tolerance of Fe/ZSM-5 Catalyst for the Selective Catalytic Reduction of NOx,”Korean J. Chem. Eng.,19, 574 (2002).CrossRefGoogle Scholar
  10. Manley, T. C., “The Electrical Characteristics of the Ozone Discharge,”Trans. Electrochem. Soc.,84, 83 (1943).Google Scholar
  11. Miessner, H., Francke, K.-P., Rudolph, R. and Hammer, T., “NOx Removal in Excess Oxygen by Plasma-Enhanced Selective Catalytic Reduction,”Catal. Today,75, 325 (2002).CrossRefGoogle Scholar
  12. Mok, Y. S., Ham, S. W. and Nam, I.-S., “Mathematical Analysis of Positive Pulsed Corona Discharge Process Employed for Removal of Nitrogen Oxides,”IEEE Trans. Plasma Sci.,26(5), 1566 (1998).CrossRefGoogle Scholar
  13. Mok, Y. S., Koh, D. J., Kim, K. T. and Nam, I.-S., “Nonthermal Plasma-Enhanced Catalytic Removal of Nitrogen Oxides over V2O5/TiO2 and Cr2O3/TiO2,”Ind. Eng. Chem. Res.,42(13), 2960 (2003).CrossRefGoogle Scholar
  14. Mok, Y. S., Dors, M. and Mizerazcyk, J., “Effect of Reaction Temperature on NOx Removal and Formation of Ammonium Nitrate in Non-thermal Plasma Process Combined with Selective Catalytic Reduction,”IEEE Trans. Plasma Sci.,32(2), 799 (2004).CrossRefGoogle Scholar
  15. Pârvulescu, V. I., Grange, P. and Delmon, B., “Catalytic Removal of NO,”Catal. Today,46, 233 (1998).CrossRefGoogle Scholar
  16. Penetrante, B. M., Brusasco, R. M., Merritt, B. T. and Vogtlin, G. E., “Environmental Applications of Low-Temperature Plasmas,”Pure Appl. Chem.,71, 1829 (1999).Google Scholar
  17. Praserthdam, P., Chaisuk, C. and Mongkhonsi, T., “The Nature of Surface Species on Modified Pt-Based Catalysts for the SCR of NO by C3H6 under Lean-Burn Condition,”Korean J. Chem. Eng.,20, 32 (2003).CrossRefGoogle Scholar
  18. Yoon, S., Panov, A. G., Tonkyn, R. G., Ebeling, A. C., Barlow, S. E. and Balmer, M. L., “An Examination of the Role of Plasma Treatment for Lean NOx Reduction over Sodium Zeolite Y. and Gamma Alumina Part 1. Plasma Assisted NOx Reduction over NaY. and Al2O3,”Catal. Today,72, 243 (2002).CrossRefGoogle Scholar

Copyright information

© Korean Institute of Chemical Engineering 2004

Authors and Affiliations

  1. 1.Department of Chemical EngineeringCheju National UniversityJejuSouth Korea
  2. 2.Department of Chemical EngineeringPohang University of Science and TechnologyPohangSouth Korea

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