 Effects of vacuum freeze drying pretreatment on biomass and biochar propertiesFanbin Meng and Donghai Wang Renewable Energy, 2020, vol. 155, issue C, 1-9 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. Keywords: Biochar; Pyrolysis; Vacuum freeze drying; Porous structure; Pretreatment (search for similar items in EconPapers) Downloads: (external link) Related works: Export reference: BibTeX RIS (EndNote, ProCite, RefMan) HTML/Text Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:155:y:2020:i:c:p:1-9 DOI: 10.1016/j.renene.2020.03.113 Access Statistics for this article Renewable Energy is currently edited by Soteris A. Kalogirou and Paul Christodoulides More articles in Renewable Energy from Elsevier |
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