Direct conversion of NO and SO2 in flue gas into fertilizer using ammonia and ozone

Yujin Hwang, Abid Farooq, Hyung Won Lee, Seong Ho Jang, Sung Hoon Park, Myong Hwa Lee, Seuk Cheun Choi, Young Kwon Park

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21 Scopus citations


This study focused on the simultaneous removal of NO and SO2 from an industrial flue gas stream. To evaluate the removal efficiency of NO and SO2 using O3 and NH3, the consumption of two reactants (O3 and NH3) in line with the conversion of NO and SO2 was quantified experimentally. In addition, NO and SO2 were converted to valuable fertilizers, NH4NO3 and (NH4)2SO4. To identify a principle strategy to enhance the generation of fertilizer, Fourier transform infrared spectroscopy was used to examine the reaction mechanisms for the formation of NH4NO3 and (NH4)2SO4. Acceleration of SO2 oxidation could be achieved effectively by adding NO to a gas mixture of SO2, NH3, and O3. The formation of HNO3 might be enhanced by the simultaneous feeding of NO and SO2. Particle generation was also 10 times higher for NH3/(NO + SO2) than for NH3/NO and for NH3/SO2, which is a prominent feature of this study. Moreover, the introduction of steam had a positive influence on particle generation. This method offers dual applications for NO and SO2 removal from a flue gas stream and direct fertilizer generation.

Original languageEnglish
Article number122581
JournalJournal of Hazardous Materials
StatePublished - 5 Oct 2020


  • Ammonium nitrate
  • Ammonium sulfate
  • Fertilizers
  • NO and SO removal in waste flue gas
  • Ozone


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