Kinetic analysis on water adsorption of thermally upgraded lignite

Mo, Qiong; Liao, Junjie; Chang, Liping; Yong, Han; Wang, Bao

doi:10.1016/j.fuproc.2020.106603

Cited by 11 publications

(4 citation statements)

References 48 publications

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“…The reason is that hydroxyl structures and aromatic benzene rings together form a highly stable hyperconjugated system; in contrast, oxygencontaining functional groups on aliphatic chains are generally ordinary C−O structures that require little energy for breakage and detachment, so the detachment of aliphatic structures dominates the changes in the content of oxygen-containing functional groups under the experimental conditions. This finding coincides with the conclusions from the research by Mo et al 38 on the failure temperature of phenolic hydroxyl and alcoholic hydroxyl.…”

Section: Analysis On Ft-ir Experimental Resultssupporting

confidence: 93%

Changes in the Microstructure and Wettability of Water-Containing Coal after Hot Flue Gas (CO₂–N₂) Injection

Liu,

Zha,

Lin

et al. 2024

Energy Fuels

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This study aims to explore changes in the microstructure and wettability of water-containing coal after hot flue gas (CO 2 −N 2 ) injection. To achieve this aim, thermal modification was conducted on Wulan anthracite with the aid of an experimental platform for coal modification by hot flue gas injection, and changes in the microscopic characteristics before and after the modification were investigated by means of Fouriertransform infrared spectroscopy (FT-IR) and carbon-13 nuclear magnetic resonance ( 13 C NMR). The results demonstrate that affected by acidic and hydrothermal environments, some oxygencontaining functional groups and aliphatic side chains in the molecular structure become detached. To be specific, the coefficient of oxygen-containing functional groups I O declines by 19.3%, and the aliphatic carbon content f al decreases by 32.7%. With the obtained microscopic data, the coal macromolecular structure models before and after the modification were established and verified by inverting the 13 C NMR spectra, and the coal matrix models with a projection area of 100 nm 2 were also generated. Subsequently, the wetting behavior of a water cluster on the coal matrix model was simulated by a molecular dynamics method. Based on the simulation results, a method of characterizing the microscopic wettability according to the maximum spreading area H and the maximum height D was put forward. The results are pretty consistent with the experimentally measured wettability. These results can lay a foundation for researching the microscopic control mechanism of water-containing coal seam modification by hot flue gas injection.

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Section: Analysis On Ft-ir Experimental Resultssupporting

confidence: 93%

Changes in the Microstructure and Wettability of Water-Containing Coal after Hot Flue Gas (CO₂–N₂) Injection

Liu,

Zha,

Lin

et al. 2024

Energy Fuels

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show abstract

“…As shown in Figure S14, S21, and S22 and Table 1, in the adsorption stage, the calculated apparent activation energies ( E a ) at 40 % and 70 % RH were −34.8 and −60.9 kJ mol −1 , respectively, illustrating that the increase in temperature hinders the adsorption of water molecules. This phenomenon is consistent with the results of previous reported studies [42, 43] . Moreover, compared with 70 % RH, a lower E a at 40 % RH indicates a higher adsorption rate owing to the stronger hydrogen bond interactions between water molecules and the strong polar groups of CPOS‐6.…”

Section: Resultssupporting

confidence: 93%

“…This phenomenon is consistent with the results of previous reported studies. [42,43] Moreover, compared with 70 % RH, a lower E a at 40 % RH indicates a higher adsorption rate owing to the stronger hydrogen bond interactions between water molecules and the strong polar groups of CPOS-6. At high RH (70 %), a two-stage adsorption process was observed.…”

Section: Forschungsartikelmentioning

confidence: 99%

Crystalline Porous Organic Salt for Ultrarapid Adsorption/Desorption‐Based Atmospheric Water Harvesting by Dual Hydrogen Bond System

Zhang

Das

et al. 2022

Angewandte Chemie

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In recent years, the porous sorbent-assisted atmospheric water harvesting (AWH) method has emerged as an effective approach for solving water crises without geographical restrictions. However, there is a limited array of porous adsorbent materials that can be used for AWH, which are inadequate to meet the needs under different climatic conditions. In light of this, herein, we synthesize a new crystalline porous organic salt (CPOS; denoted as CPOS-6) possessing a dual hydrogen bond system and verify its applicability toward AWH for the first time. Unlike other reported CPOSs, CPOS-6 displays an S-shaped water sorption isotherm owing to the presence of the dual hydrogen bond system. Under simulated drought conditions in Xinjiang Uygur Autonomous Region, CPOS-6 exhibits long-term water adsorption-desorption cycling stability, low water desorption temperature, and ultrarapid adsorption-desorption kinetics. The results confirm that CPOS-6 is an effective sorbent material for AWH.

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“…The reasons lie in the theoretical and practical aspects from the point of view of the natural environment of the sorbent, the original conditions of its occurrence, and the conditions under which the sorbent is used. The coal substance has the ability to sorb low molecular weight substances such as water vapour [1][2][3][4][5][6][7], methanol vapour [8][9][10][11], and hydrocarbons [12][13][14][15][16][17]. The process can occur on its surface by physical bonding (physical adsorption) or by formation of covalent chemical bonds (chemical adsorption, chemisorption) or by volumetric absorption that affects its structure (absorption).…”

Section: Introductionmentioning

confidence: 99%

Vapour Sorption on Coal: Influence of Polarity and Rank

et al. 2022

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The surface properties of coal, interactions with gaseous and vapour media, and knowledge of the pore structure are important in terms of preparation, use, and utilisation of coal. This publication combines new unpublished data with analyses included in earlier publications by the research team to expand and systematise information on the sorption of water vapour, methanol vapour, and the saturated and unsaturated hydrocarbons hexane, 1-hexene, heptane, 1-heptene, octane on coals of different ranks. The study showed that the affinity of coal for water and methanol is related to the content of oxygen in the coal rather than the rank of the coal. Water sorption is a multilayer phenomenon, while methanol sorption is a monolayer phenomenon. The water monolayer is greater than that of methanol for low-rank coal, but for the higher-rank coals it is the opposite. The sorption capacity of the applied hydrocarbons depends on the presence or absence of a double bond and the size of the molecule. It increases in the order: n-octane < n-heptane/n-hexane < 1-heptene < 1-hexene. The effect of a double bond is dominant over the influence of the length and shape of the molecule.

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Kinetic analysis on water adsorption of thermally upgraded lignite

Cited by 11 publications

References 48 publications

Changes in the Microstructure and Wettability of Water-Containing Coal after Hot Flue Gas (CO₂–N₂) Injection

Changes in the Microstructure and Wettability of Water-Containing Coal after Hot Flue Gas (CO₂–N₂) Injection

Crystalline Porous Organic Salt for Ultrarapid Adsorption/Desorption‐Based Atmospheric Water Harvesting by Dual Hydrogen Bond System

Vapour Sorption on Coal: Influence of Polarity and Rank

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Kinetic analysis on water adsorption of thermally upgraded lignite

Cited by 11 publications

References 48 publications

Changes in the Microstructure and Wettability of Water-Containing Coal after Hot Flue Gas (CO2–N2) Injection

Changes in the Microstructure and Wettability of Water-Containing Coal after Hot Flue Gas (CO2–N2) Injection

Crystalline Porous Organic Salt for Ultrarapid Adsorption/Desorption‐Based Atmospheric Water Harvesting by Dual Hydrogen Bond System

Vapour Sorption on Coal: Influence of Polarity and Rank

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Product

Resources

About

Changes in the Microstructure and Wettability of Water-Containing Coal after Hot Flue Gas (CO₂–N₂) Injection

Changes in the Microstructure and Wettability of Water-Containing Coal after Hot Flue Gas (CO₂–N₂) Injection