Insight into the kinetics and thermodynamic analyses of co-pyrolysis using advanced isoconversional method and thermogravimetric analysis: A multi-model study of optimization for enhanced fuel properties

Choudhary, Jitendra; Alawa, Bablu; Chakma, Sankar

doi:10.1016/j.psep.2023.03.033

Cited by 13 publications

(13 citation statements)

References 41 publications

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“…The advanced isoconversional (AIC) model was employed for the determination of activation energy during thermal decomposition . For a series of runs performed at different heating rates (β), the E a value at each conversion was determined by solving the following function and minimizing the summation normalΦ ( E α ) = min ( ∑ i = 1 n ∑ j ≠ i n I false( E α , T α , i false) β false( j false) I false( E α , T α , j false) β false( i false) ) = n ( n − 1 ) where the temperature integral term can be expressed as I ( E α , T α , i ) = ∫ T α − Δα T α exp ( − E α R T ) normald T …”

Section: Thermal Degradation Kinetics Of the Cnc Filmsupporting

confidence: 89%

“…The thermodynamic parameters such as enthalpy (Δ H ), Gibbs free energy (Δ G ), and entropy (Δ S ) can be evaluated by the equations mentioned below: normalΔ H = E − R T m normalΔ G = E + R × T m × ln ( k normalB T normalm h A ) normalΔ S = normalΔ H − normalΔ G T normalm where Δ H is enthalpy (kJ mol –1 ), Δ G is Gibb’s free energy (kJ mol –1 ), Δ S is the entropy (kJ mol –1 K –1 ), R is the universal gas constant (8.3145 J mol –1 K –1 ), k B is the Boltzmann constant (1.381 × 10 –23 J K –1 ), h is the Planck constant (6.626 × 10 –34 J s –1 ), and T m is the maximum peak temperature observed in the DTG curve. Based on this analysis, the thermodynamic parameters have been determined and are presented in Figure .…”

Section: Thermal Degradation Kinetics Of the Cnc Filmmentioning

confidence: 99%

Section: Thermal Degradation Kinetics Of the Cnc Filmmentioning

confidence: 99%

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Sono-Extracted Crystalline Nanocellulose Thin Film as a Supporting Material for Fabrication of Highly Sensitive and Stable Flexible Sensors for Thermal Applications

Chandel,

Kumar,

Choudhary

et al. 2023

ACS Appl. Eng. Mater.

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In this study, we presented a durable, nontoxic, lightweight, stable, and highly sensitive flexible thermal sensor fabricated using a crystalline nanocellulose (CNC) thin film as a substrate. The CNCs were extracted from crude sawdust of chir wood by an improvised sonoextraction method, which needs relatively much less chemicals at various steps such as delignification, bleaching, and hydrolysis. The cast CNC thin film had appreciable flexibility with an average thickness of ∼10 μm and an estimated crystallinity index of ∼80.06%. The CNC film shows exceptional thermal stability up to 500 K. A thermal sensor based on the principle of a resistance thermometer was fabricated, which weighed ∼0.13 g. The fabricated thermal sensor on CNC thin film was examined over a period of 4 weeks for stability under varying temperature conditions. Along with high stability, a sensitivity of 0.6%/°C was recorded. The present investigation shows the excellent applicability of the extracted CNCs and their thin films for thermal sensor device fabrication. Additionally, thermal degradation studies using the advanced isoconversional method, Kissinger's equation, and Cardio Master plot provided further information on thermal stability with kinetics and thermodynamics parameters such as activation energy, preexponential factor, and reaction mechanism.

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Section: Thermal Degradation Kinetics Of the Cnc Filmsupporting

confidence: 89%

Section: Thermal Degradation Kinetics Of the Cnc Filmmentioning

confidence: 99%

Section: Thermal Degradation Kinetics Of the Cnc Filmmentioning

confidence: 99%

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Sono-Extracted Crystalline Nanocellulose Thin Film as a Supporting Material for Fabrication of Highly Sensitive and Stable Flexible Sensors for Thermal Applications

Chandel,

Kumar,

Choudhary

et al. 2023

ACS Appl. Eng. Mater.

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“…To deconvolute the release of carbonaceous coke from polymeric species, a TGA program was implemented based on methods applied to biomass fraction determination, including a temperature-programmed pyrolysis (TPP) stage to 600 °C followed by cooling in an inert atmosphere and temperature-programmed oxidation (TPO) to 650 °C after that. Polyethylene has been shown to pyrolyze under an inert atmosphere by 550 °C . At the same time, carbonaceous coke does not appreciably release in an inert atmosphere below 600 °C .…”

Section: Resultsmentioning

confidence: 99%

“…Polyethylene has been shown to pyrolyze under an inert atmosphere by 550 °C. 53 At the same time, carbonaceous coke does not appreciably release in an inert atmosphere below 600 °C. 54 Conversely, in air, coke is shown to release at temperatures below 650 °C, 54−56 which was confirmed by tests with pure PE substrate and activated carbon (Figures S8− S10).…”

Section: Further Indicating Nonterminal C−c Cleavage At Intermediate ...mentioning

confidence: 99%

Investigation into the Reaction Pathways and Catalyst Deactivation for Polyethylene Hydrogenolysis over Silica-Supported Cobalt Catalysts

Borkar

Helmer

Panicker

et al. 2023

ACS Sustainable Chem. Eng.

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Chemical repurposing has emerged as a promising route to valorize "end-of-use" plastic waste and mitigate its release to the environment. In this work, we applied silica-supported cobalt (5 wt % Co/SiO 2 ) catalysts to produce liquid-range hydrocarbons (C 5 −C 30 ) in the batch phase at 200−300 °C, 20−40 bar H 2 , and 2−36 h with high selectivity and investigated the reaction pathways, the influence of catalyst phase on the product yields and selectivity, and the catalyst deactivation mechanisms. Reaction conditions were optimized for improving liquid product yields at 275 °C, 30 bar H 2 , and 8 h reaction time, giving a 55% liquid product yield (C-mole basis), comprising 75% of nonsolid products, with gas yields limited to ∼19%. By tracking product evolution over time and with varying cobalt surface density, we propose a multipathway mechanism, including a dominant, nonterminal C−C cleavage route on the polymer chain over the catalyst, which drives the high liquid product selectivity. The catalyst also showed recyclability over four reactions with reduced activity and a shift in yield toward liquid products after the first reaction. It was effectively regenerated by calcination under air at 450 °C. We combined the reactivity data with powder X-ray diffraction (PXRD), thermogravimetric analysis coupled with mass spectrometry (TGA-MS), and catalyst surface areas via N 2 physisorption of various fresh, spent, recycled, and regenerated catalysts to attribute the reduced activity and selectivity shift mainly to the presence of a recalcitrant polymer species embedded on the catalyst, comprising 10.5−18.5 wt % of the spent catalyst, which obstructs access to active sites and increases liquid selectivity and overshadows the influence of carbonaceous coke or catalyst phase reduction to Co. Moreover, we successfully applied the catalyst to various postconsumer polyethylene (HDPE and LDPE) samples. These results move the field toward more sustainable and economically viable catalysts for the chemical upcycling of waste plastics.

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Study on pyrolysis behavior of agricultural and forestry wastes using thermogravimetric‐Fourier transform infrared spectrometer (TG‐FTIR)

Liu,

Li,

Liu

et al. 2023

Asia-Pacific J Chem Eng

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To investigate the effective utilization of agricultural and forestry wastes for mitigating the shortage of primary energy and environmental pollution, the pyrolysis behavior of corn straw (CS), wheat straw (WS), and poplar sawdust (PS) was studied using thermogravimetric–Fourier transform infrared (TG‐FTIR) analysis. The activation energies and pyrolysis mechanism functions of different biomass types were calculated. The results showed that the functional group structures of the gaseous products generated from the pyrolysis of different biomass types were similar, mainly including OH, aliphatic CH, CO, aromatic ring skeleton, aromatic CH, and CO groups. These functional group structures mainly existed in oxygen‐containing compounds such as phenols, ketones, aldehydes, acids, esters, alcohols, and ethers. The pyrolysis process of agricultural and forestry wastes exhibited certain differences, with the PS undergoing thermal decomposition more easily, while the thermal decomposition mechanism functions of the two agricultural wastes (CS and WS) were similar. PS had a later initial release time for volatile matter, and the oxygen compounds produced by its pyrolysis were the highest, followed by WS and CS.

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Insight into the kinetics and thermodynamic analyses of co-pyrolysis using advanced isoconversional method and thermogravimetric analysis: A multi-model study of optimization for enhanced fuel properties

Cited by 13 publications

References 41 publications

Sono-Extracted Crystalline Nanocellulose Thin Film as a Supporting Material for Fabrication of Highly Sensitive and Stable Flexible Sensors for Thermal Applications

Sono-Extracted Crystalline Nanocellulose Thin Film as a Supporting Material for Fabrication of Highly Sensitive and Stable Flexible Sensors for Thermal Applications

Investigation into the Reaction Pathways and Catalyst Deactivation for Polyethylene Hydrogenolysis over Silica-Supported Cobalt Catalysts

Study on pyrolysis behavior of agricultural and forestry wastes using thermogravimetric‐Fourier transform infrared spectrometer (TG‐FTIR)

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