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

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

Energy, 2019, vol. 187, issue C

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.

Keywords: Oxy-fuel combustion; Reaction mechanism; Plug-flow reactor; Pyridine oxidation; NO (search for similar items in EconPapers)
Date: 2019
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Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:187:y:2019:i:c:s0360544219316445

DOI: 10.1016/j.energy.2019.115954

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