Pyrolysis mechanism study of minimally damaged hemicellulose polymers isolated from agricultural waste straw samples

Wang, Shurong; Ru, Bin; Griffiths, D. Ll.; Sun, Wuxing; Qiu, Kunzan; Zhou, Jinsong

doi:10.1016/j.biortech.2015.04.098

Cited by 122 publications

(41 citation statements)

References 33 publications

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“…Several authors reported the increase of absorbance around 1505 cm −1 in thermally treated beech, teak and oak wood [33]. Demethoxylation at thermal treatment is supported by the shifting of maximum absorption from 1505 cm −1 to 1512 cm −1 [34,35]. This trend was also observed by other authors [36,37].…”

Section: Ftir Spectra Of Lignin Isolated From Heat Treated Samplessupporting

confidence: 63%

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

2020

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Thermal modification of wood causes chemical changes that significantly affect the physical, mechanical and biological properties of wood; thus, it is essential to investigate these changes for better utilization of products. Fourier transform infrared spectroscopy and size exclusion chromatography were used for evaluation of chemical changes at thermal treatment of oak wood. Thermal modification was applied according to Thermowood process at the temperatures of 160, 180 and 210 °C, respectively. The results showed that hemicelluloses are less thermally stable than cellulose. Chains of polysaccharides split to shorter ones leading to a decrease of the degree of polymerization and an increase of polydispersity. At the highest temperature of the treatment (210 °C), also crosslinking reactions take place. At lower temperatures degradation reactions of lignin predominate, higher temperatures cause mainly condensation reactions and a molecular weight increase. Chemical changes in main components of thermally modified wood mainly affect its mechanical properties, which should be considered into account especially when designing various timber constructions.

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Section: Ftir Spectra Of Lignin Isolated From Heat Treated Samplessupporting

confidence: 63%

Structural Changes of Oak Wood Main Components Caused by Thermal Modification

2020

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“…From the structure of cellulose, hemicellulose and lignin as shown in Fig. 1, the chemical compounds of Acid, Furans, Furfural, Neutral sugars and Phenols are the main productions from the pyrolysis of cellulose (Mettler et al, 2012a) and hemicellulose (Wang et al, 2015). The lignin is a rich source of phenolic compounds.…”

Section: Py-gc/ms Analysismentioning

confidence: 99%

Kinetic and energy production analysis of pyrolysis of lignocellulosic biomass using a three-parallel Gaussian reaction model

Chen

Zhang

2016

Bioresource Technology

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The kinetic and energy productions of pyrolysis of a lignocellulosic biomass were investigated using a three-parallel Gaussian distribution method in this work. The pyrolysis experiment of the pine sawdust was performed using a thermogravimetric-mass spectroscopy (TG-MS) analyzer. A three-parallel Gaussian distributed activation energy model (DAEM)-reaction model was used to describe thermal decomposition behaviors of the three components, hemicellulose, cellulose and lignin. The first, second and third pseudocomponents represent the fractions of hemicellulose, cellulose and lignin, respectively. It was found that the model is capable of predicting the pyrolysis behavior of the pine sawdust. The activation energy distribution peaks for the three pseudo-components were centered at 186.8, 197.5 and 203.9kJmol(-1) for the pine sawdust, respectively. The evolution profiles of H2, CH4, CO, and CO2 were well predicted using the three-parallel Gaussian distribution model. In addition, the chemical composition of bio-oil was also obtained by pyrolysis-gas chromatography/mass spectrometry instrument (Py-GC/MS).

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“…D-mannose, a structural monosaccharide of hemicellulose, was also detected (2.27% area). The presence of D-allose (2.61% area) in the WV is due to the isomerization of sugars derived from hemicellulose during pyrolysis, according to some authors (Wang et al, 2015). This composition, rich in different organic compounds, provides WV with a wide variety of properties, particularly insecticidal, fungicidal, or herbicidal properties, among others, which have been extensively studied in recent years, LUIS AGUIRRE Et AL.…”

Section: Wv Composition By Groupmentioning

confidence: 98%