Comparative study on the pyrolysis behaviors of rice straw under different washing pretreatments of water, acid solution, and aqueous phase bio-oil by using TG-FTIR and Py-GC/MS

Chen, Dengyu; Wang, Yun; Liu, Yixuan; Cen, Kehui; Cao, Xiaobing; Ma, Zhongqing; Li, Yanjun

doi:10.1016/j.fuel.2019.04.086

Cited by 153 publications

(49 citation statements)

References 57 publications

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“…Fig 7 gives the 3D FTIR spectrogram of volatiles in the pyrolysis of samples at the heating rate of 20˚C min -1 , showing the variation of absorption intensity with T and wavenumber. Since the absorption intensity at a specific wavenumber is linearly dependent on the relative concentration of volatile components [47,48], the stronger characteristic absorption peak corresponds to the higher relative concentration of the volatile components. The gaseous products release information obtained from Fig 7 basically agrees with the results from the DTG curves.…”

Section: Plos Onementioning

confidence: 99%

Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood

Jin

Cai

et al. 2020

PLoS ONE

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To investigate the effects of urea-formaldehyde (UF) resin impregnation combined heat treatment (IMPG-HT) on the pyrolysis behavior of poplar wood, the chemical composition, pyrolysis characteristics, pyrolysis kinetics, and gaseous products released during pyrolysis of untreated (control), IMPG-HT, IMPG and HT woods were analyzed. The results demonstrate that IMPG-HT changes pyrolysis behavior of poplar wood significantly. Unlike the control and HT samples, the thermogravimetric / derivative thermogravimetric (TG/DTG) curves of IMPG wood shift toward lower temperature, and the shoulder on DTG curves weaken or even disappear. The maximum mass loss rate of IMPG-HT samples decreases, and carbon residual yield increases to 23% or more and activation energy (E) increases sharply after conversion rate (α) reaching 0.80. HT improves the thermal stability of IMPG wood, which is represented by the increase of decomposition temperature (T d ) and DTG peak temperature (T peak ) and the higher E value of IMPG-HT wood. For the pyrolysis gaseous products, IMPG-HT wood produces nitrogen-containing gases (HNCO and NH 3 ) due to the presence of UF resin, but the amounts of these gases are less than that produced by IMPG wood because the heat treatment had removed part of N elements. (2020) Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood. PLoS ONE 15(3): e0229907. https://doi.org/ 10.Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood PLOS ONE | https://doi.org/10.1371/journal.pone.0229907 March 17, 2020 2 / 15 Fig 5. The linear fitting diagrams of IMPG-HT samples. (a) The linear fitting diagrams of IMPG-HT samples obtained by FWO method within the conversion range of 0.10<α<0.90; (b) The linear fitting diagrams of IMPG-HT samples obtained by KAS method within the conversion range of 0.10<α<0.90.

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Section: Plos Onementioning

confidence: 99%

Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood

Jin

Cai

et al. 2020

PLoS ONE

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“…This result indicates that quite a number of carbonyl groups from both VA and MMA molecules were grafted onto the bamboo cell walls of VA/MMA-B. Another slightly enhanced peak in the spectrum of VA/MMA-B is the band for the ester bond (C−O) stretching vibration at 1242 cm −1 [46]. This was caused by the successful reaction of bamboo hydroxyl groups with VA and MMA.…”

Section: Resultsmentioning

confidence: 99%

“…Among the three chemical modification methods, the lowest intensity band that corresponded to the hydroxyl group was observed in the spectrum for VA/MMA-B, and this indicates that the dimensional stability of VA/MMA-B was probably better than that of raw bamboo, VA-B, and MMA-B. The band at 2955 cm −1 is attributed to the stretching vibration of methyl (–CH 3 ) and methylene (–CH 2 –) [45,46]. Obviously, the intensity of this band in the spectrum of VA/MMA-B is higher than that in the spectra of raw bamboo, MMA-B, and VA-B, and this indicates that more MMA was successfully grafted onto the bamboo cell walls after the combined treatment of VA and MMA [33,40].…”

Section: Resultsmentioning

confidence: 99%

“…According to the DTG curves, the thermal degradation process of bamboo can be divided into three stages: the moisture evaporation stage (50–150 °C), fast devolatilization stage (150–450 °C), and carbonization stage (450–650 °C) [44,46,54,55,56]. In the fast devolatilization stage, the peak temperatures of the maximum weight loss for raw bamboo, MMA-B, VA-B, and VA/MMA-B were 317 °C, 334 °C, 333 °C, and 337 °C, respectively.…”

Section: Resultsmentioning

confidence: 99%

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Combined Chemical Modification of Bamboo Material Prepared Using Vinyl Acetate and Methyl Methacrylate: Dimensional Stability, Chemical Structure, and Dynamic Mechanical Properties

Huang

Jiang

Yu³

et al. 2019

Polymers

Self Cite

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Acetylation and in situ polymerization are two typical chemical modifications that are used to improve the dimensional stability of bamboo. In this work, the combination of chemical modification of vinyl acetate (VA) acetylation and methyl methacrylate (MMA) in situ polymerization of bamboo was employed. Performances of the treated bamboo were evaluated in terms of dimensional stability, wettability, thermal stability, chemical structure, and dynamic mechanical properties. Results show that the performances (dimensional stability, thermal stability, and wettability) of bamboo that was prepared via the combined pretreatment of VA and MMA (VA/MMA-B) were better than those of raw bamboo, VA single-treated bamboo (VA-B), and MMA single-treated bamboo (MMA-B). According to scanning electron microscopy (SEM) and Fourier transform infrared spectroscopy (FTIR) analyses, VA and MMA were mainly grafted onto the surface of the cell wall or in the bamboo cell lumen. The antiswelling efficiency and contact angle of VA/MMA-B increased to maximum values of 40.71% and 107.1°, respectively. From thermogravimetric analysis (TG/DTG curves), the highest onset decomposition temperature (277 °C) was observed in VA/MMA-B. From DMA analysis, the storage modulus (E’) of VA/MMA-B increased sharply from 15,057 Pa (untreated bamboo) to 17,909 Pa (single-treated bamboo), and the glass transition temperature was improved from 180 °C (raw bamboo) to 205 °C (single-treated bamboo).

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“…Therefore, Py-GC/MS could be widely employed to determine the effect of the reaction temperature on distribution and the content of pyrolysis products [15,16]. It was reported that guaiacol (G), p-hydroxyphenol (H), dimethoxyphenol (S) are the three most abundant phenols in bio-oil [17][18][19][20][21].…”

Section: Introductionmentioning

confidence: 99%

Pyrolysis Products Distribution of Enzymatic Hydrolysis Lignin with/without Steam Explosion Treatment by Py-GC/MS

Dong

et al. 2020

Catalysts

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This paper investigated the pyrolytic behaviors of enzymatic hydrolysis lignin (EHL) and EHL treated with steam explosion (EHL-SE) by pyrolysis-gas chromatography/mass spectrometer (Py-GC/MS). It was shown that the main component of the pyrolysis products was phenolic compounds, including G-type, H-type, S-type, and C-type phenols. With different treatment methods, the proportion of units in phenolic products had changed significantly. Meanwhile, proximate, elemental, and FTIR analysis of both lignin substrates were also carried out for a further understanding of the lignin structure and composition with or without steam explosion treatment. FTIR result showed that, after steam explosion treatment, the fundamental structural framework of the lignin substrate was almost unchangeable, but the content of lignin constituent units, e.g., hydroxyl group and alkyl group, evidently changed. It was noticeable that 2-methoxy-4-vinylphenol with 11% relative content was the most predominant pyrolytic product for lignin after steam explosion treatment. Combined with the above analysis, the structural change and pyrolysis product distribution of EHL with or without steam explosion treatment could be better understood, providing more support for the multi-functional utilization of lignin.

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Comparative study on the pyrolysis behaviors of rice straw under different washing pretreatments of water, acid solution, and aqueous phase bio-oil by using TG-FTIR and Py-GC/MS

Cited by 153 publications

References 57 publications

Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood

Effects of impregnation combined heat treatment on the pyrolysis behavior of poplar wood

Combined Chemical Modification of Bamboo Material Prepared Using Vinyl Acetate and Methyl Methacrylate: Dimensional Stability, Chemical Structure, and Dynamic Mechanical Properties

Pyrolysis Products Distribution of Enzymatic Hydrolysis Lignin with/without Steam Explosion Treatment by Py-GC/MS

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