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Characterization of char generated from solar pyrolysis of heavy metal contaminated biomass

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  • Zeng, Kuo
  • Li, Rui
  • Minh, Doan Pham
  • Weiss-Hortala, Elsa
  • Nzihou, Ange
  • Zhong, Dian
  • Flamant, Gilles

Abstract

Solar pyrolysis of raw and heavy metals (HMs) impregnated willow was performed at different temperatures (600, 800, 1000, 1200, 1400 and 1600 °C) with heating rate of 50 °C/s. CHNS, ICP-OES, SEM-EDX and BET were employed to investigate the effects of temperature and HMs contamination on char properties. The results indicated that a more ordered and aromatic char was formed with increasing pyrolysis temperature. Char carbon contents increased from 70.0% to 88.4% while hydrogen and oxygen contents declined. Char BET surface area firstly increased from 5.3 to 161.0 m2/g with rising the temperature from 600 to 1000 °C, then decreased at higher temperatures due to plastic deformation. Pyrolysis caused alkali and alkaline-earth metals (A&AEMs) enrichment in char as temperature increased from 600 to 800 °C, then their content decreased at higher temperatures. The presence of Cu or Ni led to the decrease of hydrogen and oxygen contents and significant increase of Ni or Cu in char compared with those in raw willow char. Besides, Raman and BET analysis showed that contaminated willow char had a higher ratio of G band area to the integrated area (IG/IAll) and bigger BET surface area than raw material indicating a more organized and porous structure of the char.

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  • Zeng, Kuo & Li, Rui & Minh, Doan Pham & Weiss-Hortala, Elsa & Nzihou, Ange & Zhong, Dian & Flamant, Gilles, 2020. "Characterization of char generated from solar pyrolysis of heavy metal contaminated biomass," Energy, Elsevier, vol. 206(C).
    • Handle: RePEc:eee:energy:v:206:y:2020:i:c:s0360544220312354
    DOI: 10.1016/j.energy.2020.118128
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    References listed on IDEAS

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    1. Zeng, Kuo & Li, Rui & Minh, Doan Pham & Weiss-Hortala, Elsa & Nzihou, Ange & He, Xiao & Flamant, Gilles, 2019. "Solar pyrolysis of heavy metal contaminated biomass for gas fuel production," Energy, Elsevier, vol. 187(C).
    2. Zeng, Kuo & Gauthier, Daniel & Li, Rui & Flamant, Gilles, 2017. "Combined effects of initial water content and heating parameters on solar pyrolysis of beech wood," Energy, Elsevier, vol. 125(C), pages 552-561.
    3. He, Xiao & Zeng, Kuo & Xie, Yingpu & Flamant, Gilles & Yang, Haiping & Yang, Xinyi & Nzihou, Ange & Zheng, Anqing & Ding, Zhi & Chen, Hanping, 2019. "The effects of temperature and molten salt on solar pyrolysis of lignite," Energy, Elsevier, vol. 181(C), pages 407-416.
    4. Nzihou, Ange & Stanmore, Brian & Lyczko, Nathalie & Minh, Doan Pham, 2019. "The catalytic effect of inherent and adsorbed metals on the fast/flash pyrolysis of biomass: A review," Energy, Elsevier, vol. 170(C), pages 326-337.
    5. Zeng, Kuo & Gauthier, Daniel & Li, Rui & Flamant, Gilles, 2015. "Solar pyrolysis of beech wood: Effects of pyrolysis parameters on the product distribution and gas product composition," Energy, Elsevier, vol. 93(P2), pages 1648-1657.
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