Structure and morphology variation of solid residue from co-liquefaction of lignite and Merey atmospheric residue

Yang, Tengfei; Qin, Yong; Meng, Huanshuang; Deng, Wei; Li, Chuan; Du, Juntao; Niu, Q. Jason

doi:10.1016/j.fuel.2018.05.174

Cited by 16 publications

(5 citation statements)

References 62 publications

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“…The ratio of the integrated areas of 2800–3000 to 1600 cm –1 ( I 1 ) and 700–900 to 1600 cm –1 ( I 2 ) were calculated to compare the relative abundance of the aliphatic and aromatic functional groups . The apparent aromaticity ( f a ) was calculated as where H/C is the hydrogen–carbon atomic ratio calculated from element content; a and b are empirical values, which were selected as 1.087 and 1.8 for coal, respectively …”

Section: Methodsmentioning

confidence: 99%

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Effect of Partial Rapid Pyrolysis on Bituminous Properties: From Structure to Reactivity

Huang

Ding

et al. 2020

Energy Fuels

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In this paper, typical Chinese bituminous coal was pyrolyzed rapidly and repeatedly in a high-frequency furnace at 1000 °C to investigate the changes of coal physicochemical structures, reactivities, and their relationship. The physicochemical structure was mainly characterized by Fourier transform infrared spectroscopy, Raman spectroscopy, pore analysis, and so forth. The results showed that after the rapid pyrolysis, the specific surface area reduced significantly, the average particle size and the content of amorphous carbon structure increased first and then decreased, the content of the oxygen-containing group exposed to the surface decreased, and the aromaticity increased gradually. The reactivities were analyzed by thermogravimetric analysis, including slow pyrolysis (from 105 to 1000 °C) and in situ gasification (at 850, 900, 950, and 1000 °C). For slow pyrolysis, the primary decomposition peak of pretreated samples was inhibited, whereas the secondary peak was enhanced. For in situ gasification, the reactivity was promoted after rapid pyrolysis according to the reactivity index. The Coats–Redfern method and model-free method were adopted for kinetic analysis. These reactivity changes were discussed with the evolution of the physicochemical structure in detail. For example, the variation of the decomposition peak in slow pyrolysis was implied by the content of the aliphatic and aromatic in the samples. Besides, the first rapid pyrolysis was found to be more crucial than the second rapid pyrolysis for the changes of the coal structure and reactivity.

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Section: Methodsmentioning

confidence: 99%

“…where H/C is the hydrogen−carbon atomic ratio calculated from element content; a and b are empirical values, which were selected as 1.087 and 1.8 for coal, respectively. 27 2.2.2. Raman Spectroscopy.…”

Section: /A 2959cmmentioning

confidence: 99%

Effect of Partial Rapid Pyrolysis on Bituminous Properties: From Structure to Reactivity

Huang

Ding

et al. 2020

Energy Fuels

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“…Ash content of SR was determined in order to calculate the amount of residual carbonaceous solid. The conversion of the reaction system was evaluated by the conversion efficiency of carbonaceous solid (dry-ash-free base), hereafter referred to as the conversion efficiency based on the following equation: where m coal is the mass of coal, M is the mass of products, M ad and A ad are the percentage of the moisture and ash of coal, respectively, SR is the yield of SR, and w ash is the percentage of the ash of SR.…”

Section: Methodsmentioning

confidence: 99%

Influence of the Iron Proportion on the Efficiency of an Oil-Soluble Ni–Fe Catalyst Applied in the Co-liquefaction of Lignite and Heavy Residue

Yang

Liu

Deng

et al. 2019

Ind. Eng. Chem. Res.

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Developing a fundamental insight into the active phase and the component−activity relationships of catalysts is critical to the successful design of highly efficient catalysts. The influence of the iron proportion on the performance of synthesized Ni−Fe catalysts was investigated to modulate the intrinsic catalytic activity. Furthermore, characterization features of sulfided catalysts and density functional theory methodology were combined for a comprehensive interpretation. The highest hydrogenation efficiency occurred with nickel and iron in an equimolar ratio. A significant increase in the degree of nickel sulfidation was found to coincide with an increase in the proportion of iron, which is ascribed to a lowered thermal decomposition temperature and the promotion of sulfur adsorption. In addition, benefiting from the considerably stronger H adsorption to facilitate H 2 dissociation, the (Fe,Ni) 9 S 8 phases, which exist in all sulfided catalysts, should to be the key component responsible for the observed high hydrogenation activity.

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“…Co-processing of coal and heavy oil is a new clean coal conversion technology that combines direct coal liquefaction with heavy oil hydrocracking. It not only reduces the difficulty of direct coal liquefaction but also improves the conversion efficiency of heavy oil. , Although this process can obtain a high coal conversion rate, it is accompanied by producing many solid residues. , The N content in the co-processing residue of coal and heavy oil (CR) is low, but it contains asphaltene, which is considered an ideal precursor for synthesizing functional carbon materials. − The asphaltene is conducive to forming carbon skeletons via polymerization or cross-linking reactions. , The remaining iron-containing catalysts and inorganic minerals would provide iron sources for the generation of Fe–N species, which are generally considered as effective ORR active centers. , Besides, the natural minerals contained in CR could promote the formation of porous structures…”

Section: Introductionmentioning

confidence: 99%

“…26,27 Although this process can obtain a high coal conversion rate, it is accompanied by producing many solid residues. 28,29 The N content in the co-processing residue of coal and heavy oil (CR) is low, but it contains asphaltene, which is considered an ideal precursor for synthesizing functional carbon materials. 30−32 The asphaltene is conducive to forming carbon skeletons via polymerization or cross-linking reactions.…”

Section: ■ Introductionmentioning

confidence: 99%

Fe/N/S Co-doped Porous Carbon from the Co-processing Residue of Coal and Heavy Oil for an Efficient Oxygen Reduction Reaction

Yang

et al. 2023

Ind. Eng. Chem. Res.

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The development of novel non-noble electrocatalysts to replace Pt-based materials has always been the focus of electrocatalysis research. The co-processing residue of coal and heavy oil (CR) is a carbonaceous waste with high quantities of heteroatomic compounds from coal liquefaction industries. With the aid of alkali activation and melamine doping operations at a high temperature, the CR was transformed into a material with a large specific surface area, rich hierarchical pores, and Fe, N, and S doping for application in the oxygen reduction reaction (ORR) as an electrocatalyst. The structural features and reaction performances of synthesized electrocatalysts with different components in the CR as precursors were compared. The ORR half-wave potential of the electrocatalyst with the direct utilization of the CR (0.82 V) was close to the commercial 20% Pt/C (0.85 V) under alkaline conditions, which surpassed that of the electrocatalysts derived from the toluene-soluble (0.78 V) or toluene-insoluble (0.79 V) components in the CR. The asphaltenes in the toluene-soluble component of CR and the mineral templates and the Fe-containing active species in the toluene-insoluble component of CR showed a synergistic effect on the improvement of ORR performances, which may shed light on the high-valued utilization of CR materials.

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Structure and morphology variation of solid residue from co-liquefaction of lignite and Merey atmospheric residue

Cited by 16 publications

References 62 publications

Effect of Partial Rapid Pyrolysis on Bituminous Properties: From Structure to Reactivity

Effect of Partial Rapid Pyrolysis on Bituminous Properties: From Structure to Reactivity

Influence of the Iron Proportion on the Efficiency of an Oil-Soluble Ni–Fe Catalyst Applied in the Co-liquefaction of Lignite and Heavy Residue

Fe/N/S Co-doped Porous Carbon from the Co-processing Residue of Coal and Heavy Oil for an Efficient Oxygen Reduction Reaction

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