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Improvement of low-temperature NH3-SCR performance of Cu-zeolite and vanadium catalysts through ozone injection

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  • Kim, Yanghwa
  • Lim, Ocktaeck
  • Cho, Gyubaek
  • Kim, Hongsuk

Abstract

Selective catalytic reduction (SCR), a widely used technology to mitigate NOx emissions from diesel engines, faces the challenge of improving NOx reduction efficiency at low temperatures. O3 can improve the low-temperature NOx reduction performance of SCR by oxidizing NO in exhaust gas to NO2, a more reactive molecule. This study investigates the potential of O3 assisted SCR reaction in real exhaust gas condition of diesel engine and compares the differences of two catalysts, Cu-zeolite and vanadium. The results show that NOx reduction performance at low temperature can be improved by assisting O3 in the both catalysts. The improvement of NOx reduction performance was slightly better for the Cu-zeolite catalyst than for the vanadium catalyst. This is because Cu-zeolite catalysts have a larger NO2 or HNO3 adsorption capacity and stronger bonding strength than vanadium catalysts, undergoing better SCR reaction and forming more NH4NO3.

Suggested Citation

  • Kim, Yanghwa & Lim, Ocktaeck & Cho, Gyubaek & Kim, Hongsuk, 2025. "Improvement of low-temperature NH3-SCR performance of Cu-zeolite and vanadium catalysts through ozone injection," Energy, Elsevier, vol. 322(C).
    • Handle: RePEc:eee:energy:v:322:y:2025:i:c:s0360544225011521
    DOI: 10.1016/j.energy.2025.135510
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