Study on the pyrolytic behaviour of xylan-based hemicellulose using TG–FTIR and Py–GC–FTIR

Shen, Dekui; Gu, Sai; Bridgwater, A.V.

doi:10.1016/j.jaap.2009.12.001

Cited by 488 publications

(268 citation statements)

References 24 publications

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“…CO 2 comes from the breakdown of C=O and COOH groups [42]. It would mainly come from decarboxylation reactions of O-acetyl units according to Shen et al [61]. In the present case that contribution must be less important, since the starting material is a hemicellulose mostly composed of xylose units.…”

Section: I) Xylanmentioning

confidence: 84%

“…In the present case that contribution must be less important, since the starting material is a hemicellulose mostly composed of xylose units. The CO formation is attributed to decarbonylation reactions, specifically to the breakdown of COC and C=O [42], due to the decomposition of the ringopened intermediate products [61]. The H 2 O emission during the pyrolysis stage is mainly derived from the hydroxyl groups of xylopyranose units.…”

Section: I) Xylanmentioning

confidence: 99%

“…Thus, the CO 2 emission continues, but slightly, and CH 4 is detected with a maximum near 470 °C, close to the exothermic effect observed in the DTA of xylan ( Table 1). CH 4 is formed by breaking R-CH 3 bonds, which requires elevated temperatures due to its high stability [61]. The CO 2 emission starts to increase at 550 °C, reaching a maximum rate at about 700 °C, temperature at which a new CO emission begins.…”

Section: I) Xylanmentioning

confidence: 99%

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Comparison of thermal behavior of natural and hot-washed sisal fibers based on their main components: Cellulose, xylan and lignin. TG-FTIR analysis of volatile products

et al. 2014

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Abstract:This paper presents in a comprehensive way the thermal behavior of natural and hot-.washed sisal fibers, based on the fundamental components of lignocellulosic materials: cellulose, xylan and lignin. The research highlights the influence exerted on the thermal stability of sisal fibers by other constituents such as non-cellulosic polysaccharides (NCP) and mineral matter. Thermal changes were investigated by thermal X-ray diffraction (TXRD), analyzing the crystallinity index (%Ic) of cellulosic samples, and by simultaneous thermogravimetric and differential thermal analysis coupled with Fourier-transformed infrared spectrometry (TG/DTA-FTIR), which allowed to examine the evolution of the main volatile compounds evolved during the degradation under inert and oxidizing atmospheres. The work demonstrates the potential of this technique to elucidate different steps during the thermal decomposition of sisal, providing extensible results to other lignocellulosic fibers, through the analysis of the evolution of CO 2 , CO, H 2 O, CH 4 , acetic acid, formic acid, methanol, formaldehyde and 2-butanone, and comparing it with the volatile products from pyrolysis of the biomass components. The hydroxyacetaldehyde detected during pyrolysis of sisal is indicative of an alternative route to that of levoglucosan, generated during cellulose pyrolysis.Hot-washing at 75 ºC mostly extracts non-cellulosic components of low decomposition temperature, and reduces the range of temperature in which sisal decomposition occurs, causing a retard in the pyrolysis stage and increasing Tb NCP and Tb CEL , temperatures at the maximum mass loss rate of non-cellulosic polysaccharides and cellulose decompositions, respectively. However, enriching sisal fibers in cellulose produces a decrease of Tb CEL under an oxidizing atmosphere, and furthermore, a delay of the combustion process, displacing Tb COM to higher temperatures.The results and findings of the paper would help further understanding of thermal processes where agave fibers are involved, as the decomposition of their composites.

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Section: I) Xylanmentioning

confidence: 84%

Section: I) Xylanmentioning

confidence: 99%

Section: I) Xylanmentioning

confidence: 99%

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Comparison of thermal behavior of natural and hot-washed sisal fibers based on their main components: Cellulose, xylan and lignin. TG-FTIR analysis of volatile products

et al. 2014

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“…Coupled techniques provide immediate monitoring of the volatile products released during the thermogravimetric experiments. Thermogravimetry/mass spectrometry (TG/MS) [5,14] and TG/FTIR [15] represent the most frequently applied coupled techniques in thermal analysis. Fig.…”

Section: Thermal Decomposition Products As Measured By Thermogravimetmentioning

confidence: 99%

Analytical Techniques as a Tool to Understand the Reaction Mechanism

Jakab

2015

Recent Advances in Thermo-Chemical Conversion of Biomass

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“…Several common furanoic carbohydrate pyrolysis products are also obtained from hemicelluloses; Scheme 3-4 illustrates the possible formation route of 2-furanaldehyde. Recently Shen et al [15] studied the pyrolysis of O-acetyl-4-Omethylglucorono-xylan isolated from beech wood. The formation of furfural and 1,4-anhydro-D-xylopyranose was attributed mainly to the xylan units.…”

Section: Hemicellulose Decompositionmentioning

confidence: 99%