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Control of NO x emissions from diesel engine by selective catalytic reduction (SCR) with urea

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Abstract

Among the catalysts screened, Cu-ion exchanged ZSM5 zeolite exhibited the highest NO removal activity, particularly at low reaction temperatures below 200 °C, maintaining a wide operating temperature window. The hydrothermal stability of the CuZSM5 catalyst can be improved by the optimization of metal content of the catalyst. Through the variation of reactor operating conditions, NO conversion of better than 90% could be achieved with a minimum NH3 slip. The decomposition of urea was also examined and a kinetic model for both thermal and catalytic decomposition of urea was developed. Urea-SCR over the CuZSM5 catalyst exhibited that the NO removal activity is competitive to that by NH3-SCR, indicating urea can be effectively utilized in SCR reactor system as the reducing agent.

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Authors and Affiliations

  1. Department of Chemical Engineering/School of Environmental Science and Engineering, Pohang University of Science and Technology (POSTECH), Pohang, Korea

    Joon Hyun Baik, Sung Dae Yim & In-Sik Nam

  2. Department of Chemical Engineering, Cheju National University, Jeju, Korea

    Young Sun Mok

  3. General Motors R&D Center, Warren, MI, USA

    Jong-Hwan Lee, Byong K. Cho & Se H. Oh

Authors
  1. Joon Hyun Baik
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  2. Sung Dae Yim
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  3. In-Sik Nam
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  4. Young Sun Mok
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  5. Jong-Hwan Lee
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  6. Byong K. Cho
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  7. Se H. Oh
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Correspondence to In-Sik Nam.

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Baik, J.H., Yim, S.D., Nam, IS. et al. Control of NO x emissions from diesel engine by selective catalytic reduction (SCR) with urea. Topics in Catalysis 30, 37–41 (2004). https://doi.org/10.1023/B:TOCA.0000029725.88068.97

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  • DOI: https://doi.org/10.1023/B:TOCA.0000029725.88068.97

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