Analytical fast pyrolysis of nitrogen-rich mosquito species via pyrolysis-FTIR and pyrolysis-GC/MS

Gautam, Ribhu; Vinu, R.; Vaithyanathan, Prakash

doi:10.1016/j.jaap.2019.104766

Cited by 12 publications

(4 citation statements)

References 45 publications

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“…One reason could be that the pyrolyzates' thermal stability indices (TSIp) were averaged over the six thermosequences. Certain pyrolyzates only release significantly from biochar of a specific origin, like pyridine that is a specific pyrolyzate for nitrogen-rich feedstocks [18,19]. Suárez-Abelenda et al [12] saw pyridine from thermosequences of poultry manure, freshwater algae, chestnut wood and rice straw.…”

Section: Introductionmentioning

confidence: 99%

Biochar stability scores from analytical pyrolysis (Py-GC-MS)

Ghysels

Rathnayake

Maziarka

et al. 2022

Journal of Analytical and Applied Pyrolysis

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Section: Introductionmentioning

confidence: 99%

Biochar stability scores from analytical pyrolysis (Py-GC-MS)

Ghysels

Rathnayake

Maziarka

et al. 2022

Journal of Analytical and Applied Pyrolysis

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“…The pyrolysis of biomass produced more carbonyl products than proteinous feedstock at a moderate temperature (450−600 °C). 32 Further, the release of CO was found to be 8.5 and 20.94% for CF and SCG, respectively, due to the formation of the decarbonylation reaction. 29 Decarbonylation is an organic reaction in which one or two carbonyl groups are removed from the molecules.…”

Section: ■ Results and Discussionmentioning

confidence: 95%

“…The variation in the carbonyl group arose from the compositional difference in bio-oil. The pyrolysis of biomass produced more carbonyl products than proteinous feedstock at a moderate temperature (450–600 °C) . Further, the release of CO was found to be 8.5 and 20.94% for CF and SCG, respectively, due to the formation of the decarbonylation reaction .…”

Section: Resultsmentioning

confidence: 99%

Value-Added Bio-carbon Production through the Slow Pyrolysis of Waste Bio-oil: Fundamental Studies on Their Structure–Property–Processing Co-relation

2022

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The present work addresses the transformation of bio-oil into valuable biocarbon through slow pyrolysis. The biocarbons produced at three different temperatures (400, 600, and 900 °C), 10 °C min–1 heating rate, and 30 min holding time were tested for their surface morphology, thermal stability, elemental composition, functionality, particle size, and thermal and electrical conductivity. The physicochemical study of bio-oil showed substantial carbon content, higher heating value, and lower nitrogen content. Also, the Thermogravimetric analyzer–FourierTransform Infrared Spectroscopy (TGA-FTIR) study of bio-oil confirmed that the majority of gases released were hydrocarbons, carbonyl products, ethers, CO, and CO2, with a minor percentage of water and alcohol. Overall, it was found that the pyrolysis temperature has the dominant role in the yield and properties of biocarbon. The physicochemical characterization of biocarbon showed that the higher temperature based pyrolyzed biocarbon (600 and 900 °C) improved the properties in terms of thermal stability, thermal conductivity, graphitic content, ash content, and carbon content. Furthermore, the elemental and Energy-Dispersive Spectroscopy study of biocarbon confirmed the substantial depletion in oxygen and hydrogen at a higher temperature (600 and 900 °C) than the lower temperature based pyrolyzed biocarbon (400 °C). Additionally, the purest form of the biocarbon is found at a higher temperature (900 °C) with higher thermal stability and carbon content. The study of the surface morphology of biocarbon revealed that the higher temperature (600 and 900 °C) biocarbon showed larger and harder particles than the lower temperature biocarbon (400 °C); however, the electrical conductivity of biocarbon decreased, whereas thermal conductivity increased, with an increase in the pyrolysis temperatures. Moreover, the particle size analysis of biocarbon confirmed that most of the particles were found in the range of 1 μm. The increased thermal stability, carbon content, and graphitic content and the lower ash content endorse biocarbon as an excellent feedstock for carbon-based energy storage materials.

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“…Kim et al 46 proposed a reaction pathway where the transformation of intermediates to char is followed by a concomitant increase in the concentration of HBr at high temperatures. Gautam et al 47 carried out a kinetic analysis on the pyrolysis of nitrogen-rich species and reported low activation energies at high temperatures and ascribed this phenomenon to the catalyzing effect of metals present in the sample matrix. It is worthwhile to mention that there is a significant variation of apparent activation energy with respect to conversion for all the three PCB samples, which signifies the multistep decomposition mechanism.…”

Section: Resultsmentioning

confidence: 99%

Distributed Activation Energy Modeling and Py-GC/MS Studies on Pyrolysis of Different Printed Circuit Boards for Resource Recovery

2022

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Printed circuit boards (PCBs) constitute an important segment of electronic waste that can be effectively utilized to recover valuable metals and organics. The present work is focused on the kinetics and product distribution from pyrolysis of three different PCB samples, viz., television PCB (TV PCB), motherboard PCB (MB PCB), and hard disk PCB (HD PCB). The PCBs were pretreated to eliminate most of the metallic constituents. Kinetic analysis was performed using Vyazovkin’s isoconversional method and distributed activation energy model (DAEM). The average apparent activation energies obtained from the Vyazovkin method were 207.2, 158.9, and 179.7 kJ mol –1 for the TV PCB, MB PCB, and HD PCB, respectively. The DAEM with five, four, and four pseudo-components was used to describe the decomposition kinetics of the TV PCB, MB PCB, and HD PCB, respectively. Importantly, two types of distributions, viz., Gaussian and Weibull, were utilized to effectively model the nonisothermal data obtained from thermogravimetric analysis at 10 and 20 °C min –1 . The evolution of pyrolysates belonging to functional groups such as phenolics, aromatics, aliphatics, halogenated compounds, N-containing compounds, and oxygenates was studied at two different temperatures (500 and 700 °C) using analytical pyrolysis–gas chromatograph/mass spectrometry (Py-GC/MS). The Py-GC/MS results demonstrated an increase in selectivity to aromatics and straight-chain aliphatics at 700 °C with a concomitant decrease in selectivity to phenols and oxygenates.

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Analytical fast pyrolysis of nitrogen-rich mosquito species via pyrolysis-FTIR and pyrolysis-GC/MS

Cited by 12 publications

References 45 publications

Biochar stability scores from analytical pyrolysis (Py-GC-MS)

Biochar stability scores from analytical pyrolysis (Py-GC-MS)

Value-Added Bio-carbon Production through the Slow Pyrolysis of Waste Bio-oil: Fundamental Studies on Their Structure–Property–Processing Co-relation

Distributed Activation Energy Modeling and Py-GC/MS Studies on Pyrolysis of Different Printed Circuit Boards for Resource Recovery

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