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Effect of Temperature and Mineral Matter on the Formation of NOx Precursors during Fast Pyrolysis of 2,5-Diketopiperazine

Author

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  • Jianqiang Zhou

    (National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China)

  • Pan Gao

    (National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China)

  • Changqing Dong

    (National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China)

  • Yongping Yang

    (National Engineering Laboratory for Biomass Power Generation Equipment, North China Electric Power University, Beijing 102206, China)

Abstract

2,5-diketopiperazine (DKP) was used as a N-containing model compound to investigate the formation pathway of NOx precursors (HCN, NH 3 , and HNCO) during biomass pyrolysis. The experiment was carried out using a tube furnace coupled with a Fourier Transform Infrared Spectrometer in an argon atmosphere. The results showed that NH 3 , HCN, and HNCO were the major N-containing species formed during DKP fast pyrolysis. The largest yield was HCN, followed by NH 3 and lastly HNCO. When the pyrolysis temperature was increased, the yield of NH 3 increased slowly, but the yield of HCN decreased slightly at 800~950 °C and the change accelerate rapidly above 950 °C. Then NH 3 became the main product above 1020 °C. The temperature influence was negligible on the selectivity between HCN and NH 3 from pyrolysis of DKP. H radicals played an important role in competitive reactions. It was also noted that the presence of Na + , K + , Ca 2+ , and Mg 2+ exhibited a catalytic effect on nitrogen conversion during the DKP fast pyrolysis process. K + and Na + were beneficial to the yield of NH 3 , but not to the yield of HCN. Ca 2+ and Mg 2+ could promote the formation of HCN, but prevent the formation of NH 3 .

Suggested Citation

  • Jianqiang Zhou & Pan Gao & Changqing Dong & Yongping Yang, 2018. "Effect of Temperature and Mineral Matter on the Formation of NOx Precursors during Fast Pyrolysis of 2,5-Diketopiperazine," Energies, MDPI, vol. 11(3), pages 1-10, March.
    • Handle: RePEc:gam:jeners:v:11:y:2018:i:3:p:629-:d:135854
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    References listed on IDEAS

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    2. Lebendig, Florian & Schmid, Daniel & Karlström, Oskar & Yrjas, Patrik & Müller, Michael, 2024. "Influence of pre-treatment of straw biomass and additives on the release of nitrogen species during combustion and gasification," Renewable and Sustainable Energy Reviews, Elsevier, vol. 189(PB).

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