Experimental Investigation on N2O Formation during the Selective Catalytic Reduction of NOx with NH3 over Cu-SSZ-13

Biao Liu, Dongwei Yao, Feng Wu, Lai Wei, Xingwen Li, Xinlei Wang

Research output: Contribution to journalArticlepeer-review

Abstract

N2O formation over Cu-SSZ-13 during selective catalytic reduction (SCR) of NOx with NH3 under different conditions was experimentally investigated based on a flow reactor and in situ diffused reflectance infrared Fourier transform spectroscopy experiments. The results show that the NSCR and the nonselective NH3 oxidation are the major pathways for N2O formation over Cu-SSZ-13. N2O formation at low and high temperatures usually occurs via different mechanisms. The N2O formation at low temperatures is mainly ascribed to the decomposition of NH4NO3, which mainly forms on Cu(OH)+, while at high temperatures, N2O is formed because of the NH3 oxidation by O2 and NOx. Besides, the effect of ANR, NO2/NOx ratio, and O2 and H2O concentrations on N2O formation were also studied. They all affect N2O formation, and the effects on the two mechanisms are totally different at low and high temperatures.

Original languageEnglish (US)
Pages (from-to)20516-20527
Number of pages12
JournalIndustrial and Engineering Chemistry Research
Volume58
Issue number45
DOIs
StatePublished - Nov 13 2019

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Industrial and Manufacturing Engineering

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