Characterisation of the products of low temperature pyrolysis of Victorian brown coal in a semi-continuous/flow through system

Qi, Ying; Hann, Will; Subagyono, Dirgarini J.N.; Yi, Fei; Marshall, Marc; Jackson, W. Roy; Patti, Antonio F.; Chaffee, Alan L.

doi:10.1016/j.fuel.2018.07.109

Cited by 12 publications

(5 citation statements)

References 30 publications

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“…braunii, the second stage (156–545 °C) included active copyrolysis, which involved the largest mass reduction (46–48%), due to the decomposition of carbohydrates, proteins (250–280 °C), chlorophyll, and lipids (380–480 °C) from microalgae as well as lignin- or cellulose-derived materials, phenolic aromatic carbons, substituted aliphatic carbons, and other oxygen-containing compounds in VBC. These compounds underwent depolymerization, decarboxylation, and cracking processes releasing volatile molecules, H 2 O, CO 2 , and CO. ,,,,− …”

Section: Resultsmentioning

confidence: 99%

Kinetic Study of Copyrolysis of the Green Microalgae Botryococcus braunii and Victorian Brown Coal by Thermogravimetric Analysis

et al. 2021

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The copyrolysis of the green microalgae Botryococcus braunii and Victorian brown coal was studied by thermogravimetric analysis using the Kissinger−Akahira−Sunose (KAS), Flynn−Wall−Ozawa (FWO), and Friedman methods. This research aims to study the synergistic effect of mixing B. braunii and Victorian brown coal in pyrolysis reactions on the kinetic parameter using thermogravimetric analysis. Copyrolysis was carried out at four heating rates, 10, 15, 20, and 25 °C/min. The copyrolysis reaction of B. braunii and Victorian brown coal occurred from 155.79 to 545.27 °C; this temperature range was lower than that for the pyrolysis of only B. braunii under the same conditions. However, mixing the two samples increased the thermal decomposition temperature for each conversion value (α), as well as the average activation energy, due to the presence of compounds that require high temperatures to undergo pyrolysis in the Victorian brown coal. The average activation energies of the copyrolysis reaction of B. braunii and Victorian brown coal determined using the KAS, FWO, and Friedman methods were 195.20

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Section: Resultsmentioning

confidence: 99%

Kinetic Study of Copyrolysis of the Green Microalgae Botryococcus braunii and Victorian Brown Coal by Thermogravimetric Analysis

et al. 2021

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“…The peaks at 1610-1580 cm −1 were a C=C stretching vibration peak and C=O expansion and the peak near 1697 cm −1 was attributed to contraction vibration. The C-O stretching vibration peak (1100-1000 cm −1 ) could also be found in the FTIR spectrum [34,35]. When the raw coal was treated at 900 °C, the degrees stretching vibration for O-H (3700-3200 cm −1 ), C-H (3000-2800 cm −1 ) and C=O (1697 cm −1 ) were weakened to a certain extent.…”

Section: The Characterization Of Raw Coal and Scmentioning

confidence: 81%

Synergistic Treatment of Congo Red Dye with Heat Treated Low Rank Coal and Micro-Nano Bubbles

et al. 2022

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In this study, the adsorption method and micro-nano bubble (MNB) technology were combined to improve the efficiency of organic pollutant removal from dye wastewater. The adsorption properties of Congo red (CR) on raw coal and semi-coke (SC) with and without MNBs were studied. The mesoporosity of the coal strongly increased after the heat treatment, which was conducive to the adsorption of macromolecular organics, such as CR, and the specific surface area increased greatly from 2.787 m2/g to 80.512 m2/g. MNBs could improve the adsorption of both raw coal and SC under different pH levels, temperatures and dosages. With the use of MNBs, the adsorption capacity of SC reached 169.49 mg/g, which was much larger than that of the raw coal at 15.75 mg/g. The MNBs effectively reduced the adsorption time from 240 to 20 min. In addition, the MNBs could ensure the adsorbent maintained a good adsorption effect across a wide pH range. The removal rate was above 90% in an acidic environment and above 70% in an alkaline environment. MBs can effectively improve the rate of adsorption of pollutants by adsorbents. SC was obtained from low-rank coal through a rapid one-step heating treatment and was used as a kind of cheap adsorbent. The method is thus simple and easy to implement in the industrial context and has the potential for industrial promotion.

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“…Results reported by Qi et al indicated that compounds obtained from brown coal pyrolysis are increasingly released with increasing temperature. Small molecules and gases are subsequently created from the decomposition of these compounds.…”

Section: Discussionmentioning

confidence: 99%

Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal

Zhu

et al. 2020

ACS Omega

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The molecular composition of organic matter formed during pyrolysis is complex. Fourier transform infrared spectroscopy (FTIR) is a good technique to investigate the coal chemical structural evolution. However, reports on the effects of chemical structure on the n -alkane yields and their relative functional groups are scarce in the literature. In our case, the chemical structural evolution process of bituminous coal obtained by pyrolysis at two different heating rates has been analyzed by pyrolysis-gas chromatography (Py-GC) and FTIR. Furthermore, some of the small molecular compounds (e.g., n -alkanes 24 can generate n -alkanes 20 or low-weight compounds) generated by gold-tube pyrolysis were identified using other GC techniques. Biomarkers were analyzed and compared to generated n -alkanes from the gold-tube pyrolysis experiments. We present the results of the relationship between the FTIR parameters and the molecular compositions that were analyzed. A good linear relationship can be seen between the FTIR parameters (C=O, C=C, and C -factor values), the carbon preference index (CPI), and the ratio of the pristane content and n -C 17 alkane content (Pr/ n -C 17 ). Furthermore, the n -alkane fraction of the pyrolysates, in particular pristane, phytane, n -C 17 alkane, and n -C 18 alkane, changed upon maturation. Our conclusions indicate that FTIR is applicable as a structural and chemical change probe to explore the pyrolysis process.

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Characterisation of the products of low temperature pyrolysis of Victorian brown coal in a semi-continuous/flow through system

Cited by 12 publications

References 30 publications

Kinetic Study of Copyrolysis of the Green Microalgae Botryococcus braunii and Victorian Brown Coal by Thermogravimetric Analysis

Kinetic Study of Copyrolysis of the Green Microalgae Botryococcus braunii and Victorian Brown Coal by Thermogravimetric Analysis

Synergistic Treatment of Congo Red Dye with Heat Treated Low Rank Coal and Micro-Nano Bubbles

Hydrocarbon Generation and Chemical Structure Evolution from Confined Pyrolysis of Bituminous Coal

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