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Article
Energy & Fuels
Bin Li et al.
Summary: Pyrolysis of wheat straw in Li2CO3-K2CO3 binary salt enhanced charring reactions and resulted in higher biochar yield. The structure of biochar showed different trends at different pyrolysis temperatures, with the C content increasing and the H and O contents decreasing at 450-550°C, and the decrease in H content and increase in O content and decrease in C content at 600-700°C. The enhanced activation effect of the molten salt at higher temperature resulted in the formation of more porous structures and enriching the biochar with O-containing groups.
Article
Energy & Fuels
Yujie Hou et al.
Summary: Low-cost kaolin modified by calcination and leaching was used as a catalyst for in-situ upgrading of Hami coal pyrolysis volatiles. The results showed that the modification process enhanced the formation of micro-/mesopores and acid sites, resulting in an increase in the light tar fraction and aromatic content in the tar. Acid-modified kaolin has the potential to be an inexpensive and efficient catalyst for upgrading coal pyrolysis tar.
Article
Chemistry, Analytical
Silvera Scaccia
Summary: This study investigated the catalytic pyrolysis of Sulcis low-rank coal with the presence of a catalyst, and analyzed the properties of the products. The results showed that the addition of a catalyst significantly improved the yield of gas products during coal pyrolysis, and the nickel catalyst had a positive effect on the production of H2.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2023)
Article
Thermodynamics
Bin Li et al.
Summary: The effect of oxygen equivalence ratio (ER) on oxidative fast pyrolysis of pine sawdust was studied. Oxygen mainly oxidized the biochar, providing the largest contribution to heat demand during biomass pyrolysis for autothermal operation. The biochar yield decreased from 21.03 to 9.5 wt% with an increase in ER from 0 to 11.15%. The addition of oxygen altered the formation and distribution of bio-oil, leading to the consumption of light compounds and promotion of anhydrosugar formation.
Article
Energy & Fuels
Tong Xu et al.
Summary: In this study, the emission of NO during the co-combustion of municipal sludge and Meihuajing bituminous coal was investigated. The results from both experiments and ReaxFF MD simulations showed a negative synergistic effect on NO emission, while a positive synergistic effect on N2 and NO2 emissions was observed. The contribution of MHJ to the MS-NO emission during co-combustion was significant, while MS had little impact on the MHJ-NO emission. These findings were attributed to the higher oxygen consumption of MHJ, resulting in increased OH radicals and nitrogen-containing compounds formation.
Article
Multidisciplinary Sciences
Qi Dong et al.
Summary: This study presents a catalyst-free thermochemical depolymerization method that uses a spatial temperature gradient and a temporal heating profile to efficiently convert waste plastic into monomers. By applying this approach, polypropylene (PP) and poly(ethylene terephthalate) (PET) were successfully depolymerized with high yields.
Article
Engineering, Multidisciplinary
Shu Zhang et al.
Article
Thermodynamics
Zhao Lei et al.
Summary: The generation mechanism of light tar during Shenfu bituminous coal pyrolysis was investigated using a combination of TGA, Py-GC/MS, TGA-FTIR, and ReaxFF simulations. The study showed that the pyrolysis process involved activation, pyrolysis, and condensation stages, with the initiation of coal pyrolysis attributed to the cleavage of oxygen-containing groups. The reaction mechanism of light tar was identified as free radical addition reaction, primarily deriving free radicals from the cleavage of C-O chemical bonds.
Article
Thermodynamics
Tong Xu et al.
Summary: The behaviors of municipal sludge/coal co-combustion were investigated through experiments and molecular dynamic simulations. The results showed that co-combustion had positive synergistic effects on combustion rate, O-2 consumption, and CO2 yield. The combustion of sludge was inhibited while the combustion of coal was promoted during the co-combustion process. The formation of carbonaceous gas during sludge/coal co-combustion was accelerated by the attack of •OH radicals produced by sludge on the aromatic ring structure in coal. This work provided new insights into municipal sludge/coal co-combustion.
Article
Thermodynamics
Yanpeng Ban et al.
Summary: The effect of carbide slag (CS) on the pyrolysis behavior and product distribution of low-rank coal was investigated. It was found that CS impregnation significantly affected the coal pyrolysis products, making the tar lighter and reducing the pitch content. In-situ Py-VUVPI-MS analysis revealed that the decrease in benzenes and phenols content was due to the secondary reaction of primary products catalyzed by calcium in CS, and the change of reaction path of oxygen-containing structure in coal caused by calcium catalysis.
Article
Energy & Fuels
Tong Xu et al.
Summary: This study investigated the migration behavior and mechanism of nitrogen during the municipal sludge/coal co-pyrolysis using the ReaxFF MD method. The accuracy of this method was verified by comparing the individual pyrolysis properties of sludge and coal with experimental results. It was found that there was a negative synergistic effect on the release of nitrogen during the initial stage of co-pyrolysis, while a positive synergy related to the condensation of nitrogen-containing tar was observed during the secondary reaction stage. The study provides important insights into the behavior of nitrogen during sludge/coal co-pyrolysis.
Article
Energy & Fuels
Chenguang Wang et al.
Summary: This paper investigates the connection between the spontaneous combustion characteristics of coal gangue (CG) and its pyrolysis rank. It finds that as the rank of pyrolysis increases, the thermal value and spontaneous combustion risk of CG decrease significantly. This research provides important guidance for understanding the spontaneous combustion characteristics and management of CG hills.
Article
Energy & Fuels
Dikun Hong et al.
Summary: The interactions between NH3 and coal during co-pyrolysis were investigated using ReaxFF MD simulations. It was found that coal promotes the thermal decomposition of NH3 and NH3 influences the primary and secondary reactions in coal pyrolysis. The physicochemical properties of the char produced from coal/NH3 co-pyrolysis were also analyzed. Finally, the reactivity of the char for NO reduction was examined, showing that coal/NH3 co-pyrolysis char is more conducive to NO chemisorption and N-2 generation than coal pyrolysis char.
Article
Energy & Fuels
Xufeng Zhang et al.
Summary: The efficient conversion of low rank coal can be achieved through the pyrolysis process. Tar utilization and associated problems like pipeline blockage can be resolved through cracking and refining of heavy components in tar. This study explores the use of char-supported nickel catalysts to improve the cracking of coal pyrolysis tar, with catalysts prepared by ion exchange method exhibiting the best performance. The addition of phosphorus as a non-metallic additive further enhances the tar cracking activity of the catalysts.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Energy & Fuels
Rongrong Lu et al.
Summary: In this study, artificial neural networks (ANNs) were used to establish correlations between the low-medium rank coal elements and the coal pyrolysis process parameters as well as product distribution, and the accuracy and applicability of the ANN models were validated. The results demonstrate that the ANN-based methodology is a viable alternative for predicting the product yield of coal pyrolysis.
JOURNAL OF THE ENERGY INSTITUTE
(2023)
Article
Thermodynamics
Dikun Hong et al.
Summary: The co-pyrolysis behaviors of PVC with coal were studied, showing that coal promoted the release of HCl while PVC promoted the generation of CO2, CO and CH2O. The synergistic effect reduced the activation energy and had some impact on the tar yield.
Article
Chemistry, Analytical
Qinlin Yang et al.
Summary: The catalytic co-pyrolysis of coal and hydrogen-rich substances can improve the yield and quality of coal tar. This study investigated the effects of hematite, chalcopyrite, nickel laterite, and molybdenite catalysts on the product distribution of coal-tar slurry. The addition of catalysts reduced the apparent activation energy of the pyrolysis process and promoted the generation of oxygen-containing compounds and aromatics. The presence of natural minerals enhanced the formation of light tar.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2022)
Article
Multidisciplinary Sciences
Qi Dong et al.
Summary: The study introduces a non-equilibrium continuous synthesis technique using pulsed heating and quenching, which can rapidly switch between high and low temperatures, leading to improved selectivity, lower energy cost, and good performance in various thermochemical reactions.
Article
Energy & Fuels
Yiming Wang et al.
Summary: The study demonstrates that Fe2O3 in Bayer red mud plays a catalytic role in the pyrolysis of low-rank coal, increasing gas and liquid yield and improving tar quality. Additionally, compared to Fe2O3, RM shows better performance in enhancing tar quality.
JOURNAL OF THE ENERGY INSTITUTE
(2022)
Article
Chemistry, Analytical
Mo Zheng et al.
Summary: The formation of coal char is influenced by its precursor properties and pyrolysis conditions, with an optimal temperature range identified for high yield of light tar and minimal char formation. Through large-scale modeling and long-time simulations, the origins of char precursors and their chemical structure transformation were revealed.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2021)
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Huixiu Jiang et al.
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(2020)
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Lin Dong et al.
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(2019)
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Lei Wu et al.
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Ming Sun et al.
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(2019)
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Chemistry, Applied
Fang Xu et al.
FUEL PROCESSING TECHNOLOGY
(2019)
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Sean C. Rismiller et al.
Article
Chemistry, Applied
Dikun Hong et al.
FUEL PROCESSING TECHNOLOGY
(2018)
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Yong Wu et al.
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Dikun Hong et al.
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Wenjing He et al.
Article
Agricultural Engineering
Wenjing He et al.
BIORESOURCE TECHNOLOGY
(2014)
Article
Energy & Fuels
Wenjing He et al.
Article
Chemistry, Physical
Mitchell A. Wood et al.
JOURNAL OF PHYSICAL CHEMISTRY A
(2014)
Review
Chemistry, Applied
Jianglong Yu et al.
FUEL PROCESSING TECHNOLOGY
(2013)
Article
Chemistry, Analytical
Silvera Scaccia et al.
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
(2012)
Article
Chemistry, Physical
ACT van Duin et al.
JOURNAL OF PHYSICAL CHEMISTRY A
(2001)