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

Jianqiang Zhou, Pan Gao, Changqing Dong and Yongping Yang
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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

Energies, 2018, vol. 11, issue 3, 1-10

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 .

Keywords: biomass; nitrogen-containing model compounds; fast pyrolysis; 2,5-diketopiperazine; nitrogen conversion (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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