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The characteristics and mechanism of NO formation during pyridine oxidation in O2/N2 and O2/CO2 atmospheres

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  • Luo, Jianghui
  • Zou, Chun
  • He, Yizhuo
  • Jing, Huixiang
  • Cheng, Sizhe

Abstract

The characteristics and mechanism of NO formation during pyridine oxidation in O2/CO2 atmospheres are investigated both experimentally and numerically. Comparison experiments in O2/N2 and O2/CO2 atmospheres are performed in a flow reactor at atmospheric pressure covering fuel-rich to fuel-lean equivalence ratios with temperature ranging from 773 K to 1573 K. Experimental results indicated that HCN is completely consumed in CO2 atmospheres, whereas significant amounts remain in N2 atmospheres under fuel-rich conditions. Compared with O2/N2 atmospheres, the formation of NO in O2/CO2 atmospheres is reduced by 8.85% and 5.8% under stoichiometric and fuel-lean conditions respectively, whereas it is 5.15% greater under fuel-rich conditions. A newly developed chemical kinetic mechanism based on our previous studies satisfactorily reproduced the main features of CO, HCN, and NO formation. The conversion differences of pyridine to NO between O2/CO2 and O2/N2 atmospheres are mainly due to the differences of conversion of HCN to NO. The conversion ratio discrepancies of pyridine to HCN are all less than 2%. The conversion ratios of HCN to NO in O2/N2 and O2/CO2 atmospheres are 7.2% and 15.6% under fuel-rich conditions, 65.3% and 57.4% under stoichiometric conditions, and 83.5% and 76.3% under fuel-lean conditions, respectively.

Suggested Citation

  • Luo, Jianghui & Zou, Chun & He, Yizhuo & Jing, Huixiang & Cheng, Sizhe, 2019. "The characteristics and mechanism of NO formation during pyridine oxidation in O2/N2 and O2/CO2 atmospheres," Energy, Elsevier, vol. 187(C).
    • Handle: RePEc:eee:energy:v:187:y:2019:i:c:s0360544219316445
    DOI: 10.1016/j.energy.2019.115954
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    References listed on IDEAS

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    1. Bai, Zhongze & Jiang, Xi Zhuo & Luo, Kai H., 2022. "Effects of water on pyridine pyrolysis: A reactive force field molecular dynamics study," Energy, Elsevier, vol. 238(PB).

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