Co-pyrolysis characteristics and kinetics of low metamorphic coal and pine sawdust

Zhang, Pei; Chen, Zhaoyang; Zhang, Qiuli; Zhang, Shuo; Ning, Xi-Jing; Zhou, Jun

doi:10.1039/d2ra02461f

Cited by 9 publications

(9 citation statements)

References 37 publications

(40 reference statements)

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“…These rings were not readily broken at lower pyrolysis temperatures, resulting in lower product yields 43 . The higher H content in 100PS, as illustrated in Figure 3B, serves as a hydrogen donor to accelerate the breakdown of 100C during copyrolysis 46 . The N concentration of C‐PS blends is presented in Figure 3C.…”

Section: Resultsmentioning

confidence: 99%

“…Energy‐efficient systems benefit from reduced Δ H . Different thermodynamic characteristics may be used to evaluate different feedstocks and shed light on the viability and spontaneity of the chemical reactions involved 46 …”

Section: Resultsmentioning

confidence: 99%

“…43 The higher H content in 100PS, as illustrated in Figure 3B, serves as a hydrogen donor to accelerate the breakdown of 100C during copyrolysis. 46 The N concentration of C-PS blends is presented in Figure 3C. In comparison to 100PS (with a nitrogen concentration of 0.42%), 100C exhibited a higher nitrogen concentration of 1.16%.…”

Section: Characterization Of Materialsmentioning

confidence: 98%

“…Different thermodynamic characteristics may be used to evaluate different feedstocks and shed light on the viability and spontaneity of the chemical reactions involved. 46 In light of the findings, it is recommended to operate the full-scale copyrolyser reactor between 425°C and 700°C, particularly for the examined blend, with special attention to the 60C:40PS blend. This recommendation stems from several factors including the reduced time required to achieve thermodynamic equilibrium, the positive SI, decreased energy from an external source (energy barrier), and the potential interactions of radicals.…”

Section: Impact Of Properties Of C-ps Blends On the Thermokineticsmentioning

confidence: 99%

See 3 more Smart Citations

Exploring copyrolysis characteristics and thermokinetics of peach stone and bituminous coal blends

Khoja,

Gohar,

Khan

et al. 2023

Energy Science & Engineering

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Copyrolysis, being an active area of research due to its synergistic impact in utilizing diverse fuel resources, including waste materials, like, peach stone (PS), has been the focal point for this study. PS, produced in vast quantities annually and typically intended for landscaping or insulation purposes, is being studied in combination with low‐grade bituminous coal for energy utilization focusing on thermokinetics and synergistic aspects. Coal‐peach stone (C‐PS) blends were formulated at different ratios and subjected to comprehensive characterization techniques, including ultimate analysis (CHN‐S), gross calorific value (GCV), Fourier transform infrared spectroscopy, and thermogravimetric analyzer (TGA). The ultimate analysis revealed an enhancement in carbon and hydrogen content from 45.38% to 68.08% and from 3.89% to 6.96%, respectively. Additionally, a reduction in sulfur and nitrogen content from 0.54% to 0.11% and from 1.16% to 0.42%, respectively, was observed with an increase in the ratio of PS in the C‐PS blends. The GCV of C‐PS blends ranged from 20.75 to 26.01 MJ kg−1. The pyrolysis conditions simulated in TGA are pivotal for evaluating thermokinetics and synergistic effects. The 60C:40PS blend shows a positive synergy index (SI) value of 0.0203% concerning total mass loss (MLT) indicating a favorable condition for bio‐oil generation. Coats–Redfern model‐fitting method reveals that the activation energy (Ea) of C‐PS blends increases in Section II with the addition of PS, and conversely, it decreases in Section III. The Ea for 100PS and 100C was 106.76 and 45.85 kJ mol−1 through (D3) and (F1), respectively, which was improved through the optimal blend 60C:40PS with an Ea of 94.56 and 27.58 kJ mol−1 through (D3) and (F2), respectively. The values obtained from linear regression prove that the kinetic models are effective while the thermodynamic analysis indicates that the pyrolytic behavior of C‐PS blends is characterized as endothermic, nonspontaneous, and capable of achieving thermodynamic equilibrium more rapidly.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Section: Characterization Of Materialsmentioning

confidence: 98%

Section: Impact Of Properties Of C-ps Blends On the Thermokineticsmentioning

confidence: 99%

See 2 more Smart Citations

Exploring copyrolysis characteristics and thermokinetics of peach stone and bituminous coal blends

Khoja,

Gohar,

Khan

et al. 2023

Energy Science & Engineering

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“…Fitting of the reaction steps with a nucleation-and-growth model [JMA( m )], − chemical reaction model [ F ( n )] and phase-boundary-controlled reaction model [ R ( n )] gave the following normalJ normalM normalA ( m ) : goodbreak0em1em⁣ f ( α ) = m ( 1 − α ) false[ prefix− ln ( 1 − α ) false] 1 − 1 / m F ( n ) : goodbreak0em1em⁣ f ( α ) = false( 1 − α false) n R ( n ) : goodbreak0em1em⁣ f ( α ) = n false( 1 − α false) 1 − 1 / n …”

Section: Methodsmentioning

confidence: 99%

Thermal Oxidation Behavior and Mechanisms for Silicon-Containing Arylacetylene Resins: Experimental and Reactive Force Field Molecular Dynamics Simulations

Jin,

Wang,

Zhu

et al. 2024

ACS Appl. Polym. Mater.

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Silicon-containing arylacetylene resins (PSAs) are widely used as heat-resistant resin matrices in aerospace and electronic information technology. In this paper, the thermal oxidation behavior and its mechanism for cured poly-(diethynylbenzene-dimethylsilylene-3,6-diethynylcarbazole) (DEC-DMS) were investigated via experiments and simulations. The macroscopic thermal oxidation kinetics of cured DEC-DMS were studied via thermogravimetric analysis (TGA), and the reaction steps were analyzed via mathematical deconvolution. The structural changes in the thermal oxidation residues formed at different thermal oxidation temperatures were characterized by Fourier transform infrared (FTIR) and X-ray photoelectron spectroscopy (XPS). The composition of the volatile products generated during thermal oxidation of the cured DEC-DMS was detected online via thermogravimetry-Fourier transform infrared spectroscopy (TG-FTIR). The thermal oxidation of cured DEC-DMS was simulated via reactive force field molecular dynamics (ReaxFF-MD), and possible thermal oxidation reaction pathways and volatile matter production pathways were analyzed. The results showed that the thermal oxidation of cured DEC-DMS involved three steps: (1) thermal oxidation and weight gain of unsaturated bonds, (2) oxidative cleavage of side chain groups, and (3) oxidative degradation of cross-links and aromatic rings. The oxidative degradation products included CO, CO 2 , CH 4 , and H 2 O. The results provide theoretical guidance for the development of PSAs resistant to thermal oxidation.

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Free-radical behaviors of co-pyrolysis of low-rank coal and different solid hydrogen-rich donors: A critical review

Wu,

Guan,

et al. 2023

Chemical Engineering Journal

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Co-pyrolysis characteristics and kinetics of low metamorphic coal and pine sawdust

Abstract: The research on the product distribution of the co-pyrolysis of coal and biomass and the use of the Coats–Redfern integral method and the Achar differential method to study the kinetic parameters and mechanism of the pyrolysis process.

Cited by 9 publications

References 37 publications

Exploring copyrolysis characteristics and thermokinetics of peach stone and bituminous coal blends

Exploring copyrolysis characteristics and thermokinetics of peach stone and bituminous coal blends

Thermal Oxidation Behavior and Mechanisms for Silicon-Containing Arylacetylene Resins: Experimental and Reactive Force Field Molecular Dynamics Simulations

Free-radical behaviors of co-pyrolysis of low-rank coal and different solid hydrogen-rich donors: A critical review

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