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Effects of vacuum freeze drying pretreatment on biomass and biochar properties

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  • Meng, Fanbin
  • Wang, Donghai

Abstract

The effects of vacuum freeze drying (VFD) pretreatment on poplar (PP), switchgrass (SG), and wheat straw (WS) biochar properties were studied in a muffle at air atmosphere with varied final pyrolysis temperatures (300, 500, and 700 °C). Conventional drying (CD) was used as control. As final pyrolysis temperatures increased, biochar yields from both CD- and VFD-pretreated PP, SG, and WS decreased, and yields from VFD-pretreated biomass were lower than those from CD-pretreated biomass. As temperatures increased, the pH of CD-pretreated biochar increased, while the pH of VFD-pretreated biochar did not significantly change. Higher pyrolysis temperatures increased carbon contents in all biochar. According to Fourier-transform infrared spectroscopy (FTIR), CD and VFD pretreatment had a significant effect on biochar’s functional groups. Compared to CD pretreatment, VFD-pretreated materials and biochar have an intact porous surface structure and VFD-pretreated biochar contain more micropores, suggesting that VFD pretreatment could generate high-quality porous biochar.

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  • Meng, Fanbin & Wang, Donghai, 2020. "Effects of vacuum freeze drying pretreatment on biomass and biochar properties," Renewable Energy, Elsevier, vol. 155(C), pages 1-9.
    • Handle: RePEc:eee:renene:v:155:y:2020:i:c:p:1-9
    DOI: 10.1016/j.renene.2020.03.113
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    Cited by:

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    3. Zou, Lingeng & Liu, Ye & Yu, Mengqi & Yu, Jianlin, 2023. "A review of solar assisted heat pump technology for drying applications," Energy, Elsevier, vol. 283(C).

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