Reaction mechanism of low temperature NH 3 SCR over MnOx/sewage sludge char

Jin Sun Cha, Young Kwon Park, Sung Hoon Park, Jong Ki Jeon

Research output: Contribution to journalArticlepeer-review


The reaction mechanism of selective catalytic reduction of N Ox over sewage sludge char impregnated with MnOx using NH 3 as the reducing agent was investigated. The active Mn phase was shown to be Mn 3O 4 from the XRD analysis. Adsorption was the dominant N Ox removal mechanism at low temperatures below 150 °C although reduction reaction also contributed partly to the N Ox removal at 100 ~ 150 °C. The reaction rate constants of N Ox removal over non-impregnated and Mn Ox-impregnated active chars were compared based on experimental results. The Mn Ox-impregnated char was shown to have a higher reaction rate constant and a higher N Ox removal efficiency due to a higher collision coefficient and a lower activation energy. The activation energy for both chars was shown to be relatively low (10~12 kJ/mol) under the experimental conditions of this study.

Original languageEnglish
Pages (from-to)308-311
Number of pages4
JournalApplied Chemistry for Engineering
Issue number3
StatePublished - Jun 2011


  • MN
  • N Ox
  • Reaction mechanism
  • Sewage sludge char


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