title: Comparison of the effect of wet and dry torrefaction on chemical structure and pyrolysis behavior of corncobs.
abstract: Wet and dry torrefaction of corncobs was conducted in high-pressure reactor and tube-type reactor, respectively. Effect of wet and dry torrefaction on chemical structure and pyrolysis behavior of corncobs was compared. The results showed that hemicellulose could be effectively removed from corncobs by torrefaction. However, dry torrefaction caused severe degradation of cellulose and the cross-linking and charring of corncobs. X-ray diffraction analysis revealed that crystallinity degree of corncobs was evidently enhanced during wet torrefaction, but reduced during dry torrefaction as raising treatment temperature. In thermogravimetric analysis, wet torrefied corncobs produced less carbonaceous residues than raw corncobs, while dry torrefied corncobs gave much more residues owing to increased content of acid insoluble lignin. Pyrolysis-gas chromatography/mass spectroscopy analysis indicated that wet torrefaction significantly promoted levoglucosan yield owing to the removal of alkali metals. Therefore, wet torrefaction can be considered as a more effective pretreatment method for fast pyrolysis of biomass.
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China.
authors.forename: Anqing
authors.initials: A
authors.lastname: Zheng
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China. Electronic address: zhaozl@ms.giec.ac.cn.
authors.forename: Zengli
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China.
authors.forename: Sheng
authors.initials: S
authors.lastname: Chang
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Huang
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China.
authors.forename: Kun
authors.initials: K
authors.lastname: Zhao
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China.
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Wei
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China.
authors.forename: Fang
authors.initials: F
authors.lastname: He
authors.affiliation: Key Laboratory of Renewable Energy, Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, People's Republic of China.
authors.forename: Haibin
authors.initials: H
authors.lastname: Li
mesh_terms: D056804:Biofuels; D018533:Biomass; D001709:Biotechnology / Q000379:methods*; D008401:Gas Chromatography-Mass Spectrometry; D005947:Glucose / Q000031:analogs & derivatives* / Q000302:isolation & purification; D006358:Hot Temperature; D035261:Plant Components, Aerial / Q000737:chemistry*; D011134:Polysaccharides / Q000302:isolation & purification*; D011312:Pressure; D013818:Thermogravimetry; D014867:Water / Q000737:chemistry; D014961:X-Ray Diffraction; D003313:Zea mays / Q000737:chemistry*
chemical_list: D056804:Biofuels; D011134:Polysaccharides; D014867:Water; C014989:1,6-anhydro-beta-glucopyranose; C007916:hemicellulose; D005947:Glucose
keywords: Biomass; Dry torrefaction; Fast pyrolysis; Hydrothermal pretreatment; Wet torrefaction