Focusing on the impact of inherent minerals in coal on activated carbon production and its performance: The role of trace sodium on SO2 and/or NO removal

Niu, Jian; Miao, Jiawen; Zhang, Huirong; Guo, Yanxia; Li, Linbo; Cheng, Fangqin

doi:10.1016/j.energy.2022.125638

Cited by 17 publications

(3 citation statements)

References 29 publications

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“…The (002) band at 25° reflected the stacking height of the aromatic layers. 38 The γ band on the left of the (002) band corresponded to the aliphatic hydrocarbon and alicyclic structures connected to the aromatic rings in coal. 27 The (100) band at 44° corresponded to the diameter of the aromatic ring structure.…”

Section: Resultsmentioning

confidence: 99%

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Tuning Lignite Structure via Hydromodification To Promote the Formation of Coal-Based CNTs: Exploration for the Carbon Source of CNTs

et al. 2023

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Although the preparation of coal-based carbon nanotubes (CNTs) has been realized in many studies, the relationship between carbon source structure of coal and CNT growth has not been studied in depth. In this study, we used lignite and KOH as raw material and catalyst and tuned lignite structure via hydrothermal modification to promote the formation of CNTs during catalytic pyrolysis. The main carbon source of CNTs was explored from the change of coal structure and pyrolysis characteristics. The results indicate that the CNT yield of lignite pyrolysis products is only 2.39%, but the CNT yield increases significantly after lignite was hydrothermally modified in a subcritical water–CO system. The graphitization degree, the order degree, and CNT content increase continuously with the increase in modification temperature, and C-M340 has the highest CNT content of 9.41%. Hydromodification promotes the rearrangement of aromatic carbon structures to generate more condensed aromatic rings linked by short aliphatic chains and aromatic ether bonds. The variation of these structures correlates well with the formation of CNTs and leads to the change in the carbon source components released during coal pyrolysis. Compared to lignite, modified coal releases more aromatic compounds, especially polycyclic aromatic hydrocarbons with ≥3 rings and phenols during catalytic pyrolysis, which is conducive to the transformation into carbon clusters and provides carbon sources for CNT growth. In addition, modified coal releases a slightly more carbon-containing gas (CH4 and CO) than lignite, which has a limited effect on the growth of CNTs. This study provides a novel and efficient method for enhancing the growth of CNTs by a molecular tailoring strategy of coal.

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Section: Resultsmentioning

confidence: 99%

“…Figure shows the three Gaussian peak fits for the 18, 25, and 44° bands. The (002) band at 25° reflected the stacking height of the aromatic layers . The γ band on the left of the (002) band corresponded to the aliphatic hydrocarbon and alicyclic structures connected to the aromatic rings in coal .…”

Section: Resultsmentioning

confidence: 99%

Tuning Lignite Structure via Hydromodification To Promote the Formation of Coal-Based CNTs: Exploration for the Carbon Source of CNTs

et al. 2023

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“…Research on CO and NO adsorption using Pd catalysts [ 25 ], possibly Au alloys [ 26 ] or various modifications of activated carbon [ 27 ] should be mentioned. In the case of SO 2 and NO, adsorption mechanisms on modified activated carbon [ 27 , 28 ] and bimetallic surfaces containing noble and transition metals [ 29 ] were investigated. Zeolites are also efficient adsorbents of CO 2 , SO 2 , and NO [ 30 ].…”

Section: Introductionmentioning

confidence: 99%

Effects of Structure and Composition of Adsorbents on Competitive Adsorption of Gaseous Emissions: Experiment and Modeling

et al. 2023

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Dangerous gases arising from combustion processes must be removed from the air simply and cheaply, e.g., by adsorption. This work is focused on competitive adsorption experiments and force field-based molecular modeling of the interactions at the molecular level. Emission gas, containing CO, NO, SO2, and CO2, was adsorbed on activated carbon, clay mineral, silicon dioxide, cellulose, or polypropylene at two different temperatures. At 20 °C, activated carbon had the highest NO and SO2 adsorption capacity (120.83 and 3549.61 μg/g, respectively). At 110 °C, the highest NO and SO2 adsorption capacity (6.20 and 1182.46 μg/g, respectively) was observed for clay. CO was adsorbed very weakly, CO2 not at all. SO2 was adsorbed better than NO, which correlated with modeling results showing positive influence of carboxyl and hydroxyl functional groups on the adsorption. In addition to the wide range of adsorbents, the main novelty of this study is the modeling strategy enabling the simulation of surfaces with pores of controllable sizes and shapes, and the agreement of the results achieved by this strategy with the results obtained by more computationally demanding methods. Moreover, the agreement with experimental data shows the modeling strategy to be a valuable tool for further adsorption studies.

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A review of recent advances in sustainable preparation of high-performing activated carbon for dehumidification technology

Chairunnisa,

Yu,

Saren

et al. 2024

J Mater Sci

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Focusing on the impact of inherent minerals in coal on activated carbon production and its performance: The role of trace sodium on SO2 and/or NO removal

Cited by 17 publications

References 29 publications

Tuning Lignite Structure via Hydromodification To Promote the Formation of Coal-Based CNTs: Exploration for the Carbon Source of CNTs

Tuning Lignite Structure via Hydromodification To Promote the Formation of Coal-Based CNTs: Exploration for the Carbon Source of CNTs

Effects of Structure and Composition of Adsorbents on Competitive Adsorption of Gaseous Emissions: Experiment and Modeling

A review of recent advances in sustainable preparation of high-performing activated carbon for dehumidification technology

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