Hemicellulose pyrolysis mechanism based on functional group evolutions by two-dimensional perturbation correlation infrared spectroscopy

Yang, Haiping; Li, Shujuan; Liu, Biao; Chen, Yingquan; Xiao, Jianlin; Dong, Zhiguo; Gong, Meng; Chen, Hanping

doi:10.1016/j.fuel.2020.117302

Cited by 77 publications

(34 citation statements)

References 46 publications

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“…Authors suggested a high dissolution of wheat straw hemicellulose due to the in situ formation of carbonic acid by the addition of CO 2 to water-based processes. More recently, high-pressure CO 2 -H 2 O was also reported to treat wheat straw to selectively hydrolyze hemicellulose with low concentration of acetic acid at 180 • C for 1 h due to the in situ formation of carbonic acid and acetic acid (Yang H. P. et al, 2020). It obtained the removal ratio of 82.3% for hemicellulose.…”

Section: Supercritical Co 2 Technologymentioning

confidence: 99%

“…It occurred the lignin degradation and crosslinking/polymerization in parallel both the hydrothermal treatment and ethanol extraction. The hemicellulose pyrolysis mechanism was investigated based on the functional group evolution in xylan chars between 200 and 600 • C by twodimensional correlation infrared spectroscopy (Yang H. P. et al, 2020). It observed the depolymerization and ring-opening reactions of xylan at 200 • C, the decarbonylation reaction at 300-450 • C, and the increased dehydrogenation and polycondensation reaction of xylan at 450-600 • C.…”

Section: Graded Ethanol Precipitationmentioning

confidence: 99%

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Recent Developments and Applications of Hemicellulose From Wheat Straw: A Review

Huang

et al. 2021

Front. Bioeng. Biotechnol.

110

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Hemicellulose is an important component of plant cell walls, which is mainly used in biofuels and bioproducts. The hemicellulose extracted from different plant sources and plant locations has different microstructure and molecule. Wheat straw is an important biomass raw material for the extraction of hemicellulose. The aims of this review are to summary the recent developments and various applications of hemicellulose from wheat straw. The microstructure and molecule of hemicellulose extracted by different methods are comparably discussed. The hemicellulose-based derivatives and composites are also reviewed. Special attention was paid to the applications of hemicellulose such as biofuel production, packaging field, and adsorbent. The problems and developing direction were given based on our knowledge. We expect that this review will put forward to the development and high-value applications of hemicellulose from wheat straw.

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Section: Supercritical Co 2 Technologymentioning

confidence: 99%

Section: Graded Ethanol Precipitationmentioning

confidence: 99%

Recent Developments and Applications of Hemicellulose From Wheat Straw: A Review

Huang

et al. 2021

Front. Bioeng. Biotechnol.

110

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“…In addition, there was a cross-peak Ψ (3055, 3392) in the asynchronous Ψ (ν 1 , ν 2 ) spectrum ( Figure 2 b). According to Noda’s rules, the positive cross-peak at Φ (2988, 3461) indicated that the C-H and H-O bonds of aliphatic chains exhibit the same trends, which were mainly attributed to the dehydration of pyran rings and ring fragments and indicates that the bond breaking of hydroxyl and methylene reactions of the side chains of the benzene rings are synchronous [ 37 ]. Similar results revealed that the cross-peak at Φ (3425, 2925) between -CH 2 (2925 cm −1 ) and O-H (3425 cm −1 ) corresponds to synchronous reactions that occur during the pyrolysis of hemicellulose and compounds containing -CH 2 OH groups [ 38 ].…”

Section: Resultsmentioning

confidence: 99%

Effect of Pyrolysis Temperature on the Characterisation of Dissolved Organic Matter from Pyroligneous Acid

et al. 2021

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Dissolved organic matter (DOM) greatly influences the transformation of nutrients and pollutants in the environment. To investigate the effects of pyrolysis temperatures on the composition and evolution of pyroligneous acid (PA)-derived DOM, DOM solutions extracted from a series of PA derived from eucalyptus at five pyrolysis temperature ranges (240–420 °C) were analysed with Fourier transform infrared spectroscopy, gas chromatography–mass spectroscopy, and fluorescence spectroscopy. Results showed that the dissolved organic carbon content sharply increased (p < 0.05) with an increase in pyrolysis temperature. Analysis of the dissolved organic matter composition showed that humic-acid-like substances (71.34–100%) dominated and other fluorescent components (i.e., fulvic-acid-like, soluble microbial by-products, and proteinlike substances) disappeared at high temperatures (>370 °C). The results of two-dimensional correlation spectroscopic analysis suggested that with increasing pyrolysis temperatures, the humic-acid-like substances became more sensitive than other fluorescent components. This study provides valuable information on the characteristic evolution of PA-derived DOM.

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“…Hemicelluloses are complex polysaccharides in the cell wall, consisting of branched structures that vary with biomass types. Acids, ketones, and furans are the main types of compounds in bio-oils from hemicellulose pyrolysis [36]. Lignin are polymers of highly branched, substituted, monoaromatics in the cell walls of most biomass.…”

Section: Analysis Of Bio-oils From Untreated and Acid-pretreated Biomassmentioning

confidence: 99%

Markedly Different Decomposition Temperature and Products of Biomass Pyrolysis at Low Temperature—Differentiation of Acids in Their Effects on Pretreatment

Yan

Liu

et al. 2021

Sustainable Chemistry

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Pine as a softwood and poplar as a hardwood pretreated with hydrochloric acid (HCl), phosphoric acid (H3PO4), and hypophosphorous acid (H3PO2) are studied for the pyrolytic properties and products in thermogravimetry (TG) and fixed bed reactor. The pyrolysis performances are pronouncedly distinguished due to the compositional and structural changes induced by the acid pretreatments. Reduction in the mineral content in the biomass feedstocks by pretreatment with the acids results in significant changes in the pyrolytic products. The residual P in the H3PO2-pretreated biomass apparently catalyzed the biomass deeper dehydration in pyrolysis compared to the other two mineral acids. TG analysis shows a shift of the temperature of maximum mass loss (Tmax) by more than 40 °C to lower temperature in the decomposition of the H3PO2-pretreated biomass from that of the untreated and the HCl- and H3PO4-pretreated biomass. Inspired by the striking differences in TG profiles of biomass pretreated by the three acids, thermal pyrolysis of pretreated biomass was carried out in a fixed bed reactor aimed at producing biochemicals at low temperatures (330 °C and 400 °C). The liquid products obtained from the fixed bed reactor show remarkably different major anhydrosugars as a result of pretreatment by the three acids. While phenolics dominate in the collected pyrolysis liquid from untreated biomass samples, biomass pretreated with all three acids results in substantially reduced phenolics in the bio-oils. The reduction in phenolic compounds in the bio-oil may be attributed to the reduction in mineral content in the feedstock. Consequently, the yields of anhydrosugars, mainly levoglucosan (LG) and levoglucosenone (LGO) are increased. LG yields of 20.9–28.5% from the cellulose content are obtained from HCl- and H3PO4-pretreated pine/poplar, with very low LGO yield (less than 1.7%). However, H3PO2-pretreated biomass is selective to produce LGO, especially at 330 °C. LGO yields of 7.4% and 6.7% are obtained from H3PO2-pretreated pine and poplar, respectively.

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Hemicellulose pyrolysis mechanism based on functional group evolutions by two-dimensional perturbation correlation infrared spectroscopy

Cited by 77 publications

References 46 publications

Recent Developments and Applications of Hemicellulose From Wheat Straw: A Review

Recent Developments and Applications of Hemicellulose From Wheat Straw: A Review

Effect of Pyrolysis Temperature on the Characterisation of Dissolved Organic Matter from Pyroligneous Acid

Markedly Different Decomposition Temperature and Products of Biomass Pyrolysis at Low Temperature—Differentiation of Acids in Their Effects on Pretreatment

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