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Experimental and kinetics study of NO heterogeneous reduction on semi-coke and its chars: Effects of high-temperature rapid pyrolysis and atmosphere

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  • Wang, Pengqian
  • Bai, Bo
  • Wang, Chang'an
  • Du, Yongbo
  • Wang, Chaowei
  • Che, Defu

Abstract

The high-temperature rapid pyrolysis has an evident impact on NO heterogeneous reduction over semi-coke char, which is rarely reported before. This study systematically evaluated the reactivity and kinetics of NO reduction over semi-coke and its rapid pyrolysis chars with the presence of O2 and CO using a fixed-bed reactor. The experimental results showed that the rapid pyrolysis at a desirable temperature of roughly 1100 °C can promote NO reduction over semi-coke, but excessively high and low pyrolysis temperatures were unfavorable for char-NO reaction. Partially explaining the situation was the trend of a rise before fall in specific surface area and C–O bond content of char with the rising pyrolysis temperature. The rapid pyrolysis char formed above 1100 °C showed lower activation energy than the fixed-bed pyrolysis char by 24.10%, but the higher one by 12.55% at 900 °C. The presence of CO noticeably promoted the NO reduction and reduced the activation energy by up to 41.73% at 0.75% CO, while the addition of oxygen inhibited NO reduction over semi-coke char. The suitable pyrolysis temperature with the presence of CO favored NO reduction over rapid pyrolysis char, which guided semi-coke utilization as a fuel or reducing agent.

Suggested Citation

  • Wang, Pengqian & Bai, Bo & Wang, Chang'an & Du, Yongbo & Wang, Chaowei & Che, Defu, 2023. "Experimental and kinetics study of NO heterogeneous reduction on semi-coke and its chars: Effects of high-temperature rapid pyrolysis and atmosphere," Energy, Elsevier, vol. 264(C).
    • Handle: RePEc:eee:energy:v:264:y:2023:i:c:s0360544222031863
    DOI: 10.1016/j.energy.2022.126300
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    References listed on IDEAS

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    1. Zhao, Yijun & Feng, Dongdong & Li, Bowen & Wang, Pengxiang & Tan, Heping & Sun, Shaozeng, 2019. "Effects of flue gases (CO/CO2/SO2/H2O/O2) on NO-Char interaction at high temperatures," Energy, Elsevier, vol. 174(C), pages 519-525.
    2. Yuan, Maobo & Wang, Chang’an & Zhao, Lin & Wang, Pengqian & Wang, Chaowei & Che, Defu, 2020. "Experimental and kinetics study of NO heterogeneous reduction by the blends of pyrolyzed and gasified semi-coke," Energy, Elsevier, vol. 207(C).
    3. Ouyang, Ziqu & Song, Wenhao & Li, Shiyuan & Liu, Jingzhang & Ding, Hongliang, 2020. "Experiment study on NOx emission characteristics of the ultra-low volatile fuel in a 2 MW novel pulverized fuel self-sustained preheating combustor," Energy, Elsevier, vol. 209(C).
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    Cited by:

    1. Yang, Mengchi & Liu, Chao & Xu, Lianfei & Dong, Menghao & Wang, Zhuozhi & Shen, Boxiong & Kong, Wenwen & Wang, Xin & Yang, Jiancheng, 2023. "Catalytic mechanism of bi-alkali-metal-doped char in heterogeneous reduction of NO: A density functional theory study," Energy, Elsevier, vol. 278(PB).

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