Construction of Macromolecules of Depolymerized Lignite

Liu, Muxin; Lei, Zhiping; Cao, Xianzhong; Yan, Jingchong; Shui, Hengfu; Wang, Zhicai; Hu, Jiabao; Hong, Mi-Sook

doi:10.1021/acsomega.3c01768

Cited by 3 publications

(3 citation statements)

References 35 publications

(84 reference statements)

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“…Lignite is an abundant fossil resource in nature, rich in oxygenated organic matter linked by oxygenated bridge bonds, mainly in the form of >CH–O–, >C=O, and –OH [ 1 , 2 , 3 ]. Therefore, lignite must be converted into value-added chemicals through the selective cleavage of >CH–O– bonds.…”

Section: Introductionmentioning

confidence: 99%

Catalytic Hydroconversion of Model Compounds over Ni/NiO@NC Nanoparticles

Liu,

Ma,

Tang

et al. 2024

Molecules

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The conversion of lignite into aromatic compounds by highly active catalysts is a key strategy for lignite valorization. In this study, Ni/NiO@NC nanocomposites with a high specific surface area and a vesicular structure were successfully prepared via a facile sol–gel method. The Ni/NiO@NC catalysts exhibited excellent catalytic activity for the catalytic hydroconversion (CHC) of benzyloxybenzene (as lignite-related modeling compounds) under mild conditions (120 °C, 1.5 MPa H2, 60 min). The possible mechanism of the catalytic reaction was investigated by analyzing the type and content of CHC reaction products at different temperatures, pressures, and times. More importantly, the magnetic catalyst could be conveniently separated by a magnet after the reaction, and it maintained high catalytic efficiency after six reuses. This study provides an efficient and recyclable catalyst for the cleavage of >CH–O bonds in lignite, thereby offering another way for improved utilization of lignite.

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Section: Introductionmentioning

confidence: 99%

Catalytic Hydroconversion of Model Compounds over Ni/NiO@NC Nanoparticles

Liu,

Ma,

Tang

et al. 2024

Molecules

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“…Therefore, exploring ways to achieve the clean and efficient utilization of lignite is of great significance [ 3 ]. With respect its structure [ 4 , 5 , 6 , 7 , 8 ], the organic structural units in lignite are connected by weak covalent bonds such as C-O and C-C bonds. Ethanolysis is an efficient coal conversion technology that can break weak covalent bonds in coal at a low temperature.…”

Section: Introductionmentioning

confidence: 99%

Insights into the Relationship between the Microstructure and the Catalytic Behavior of Fe2(MoO4)3 during the Ethanolysis of Naomaohu Coal

Liu,

Sun,

Tang

et al. 2023

Molecules

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Ethanolysis is an effective method to depolymerize weak bonds in lignite under mild conditions, which can result in the production of high-value-added chemicals. However, improving ethanolysis yield and regulating its resulting product distribution is a big challenge. Hence, exploiting highly active catalysts is vital. In this work, Fe2(MoO4)3 catalysts with zero-dimensional nanoparticles, one-dimensional (1D) nanorods, two-dimensional (2D) nanosheets, and three-dimensional (3D) nanoflower structures were successfully prepared and applied in the ethanolysis of Naomaohu coal. The results showed that for all samples, the yield of ethanol-soluble portions (ESP) was significantly improved. The highest yield was obtained for the Fe2(MoO4)3 nanorods, with an increase from 28.84% to 47.68%, and could be attributed to the fact that the Fe2(MoO4)3 nanorods had a higher number of exposed active (100) facets. In addition, the amounts of oxygen-containing compounds, such as ethers, esters, and phenols, increased significantly. The mechanism of ethanolysis catalyzed by the Fe2(MoO4)3 nanorods was also studied using phenylbenzyl ether (BOB) as a model compound. BOB was completely converted at 260 °C after 2 h. It is suggested that Fe2(MoO4)3 nanorods can effectively break the C-O bonds of coal macromolecules, thus promoting the conversion of coal.

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“…One such example of a commercial product is Agritone 4.5 successfully used by farmers in India [6]. It is increasingly becoming clearer that humic acids are small molecules [7] which masquerade as large supramolecular structures [8,9]. Though it has been stated that novel chemical compounds could be isolated from lignite, so far, no such compound has been isolated from it.…”

Section: Introductionmentioning

confidence: 99%

Base-Catalyzed Polymerization of a Substituted Methylenebicyclo[3.3.1]nonane

Thakur,

Raviteja,

Guru Row

et al. 2023

International Journal of Polymer Science

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Lignite humic acid on reaction with formaldehyde and aqueous alkali led to a polybicyclo[3.3.1]nonane. This was characterized spectroscopically using mass spectrometry, FT-IR, powder X-ray diffraction, TEM, and NMR studies (1H-NMR, CP-MAS-SS-NMR) which though challenging were useful for confirming the structure of the BCN polymer. The product showed an envelope peak in its MALDI-MS spectrum, based on which M ̅ n , M ̅ w , and polydispersity index have been calculated. Based on the NMR spectrum of intermediate, the presence of the N-formyl group has been shown in it. The new polymer could be useful in agriculture in water-deficient areas. Most papers on humic acids include only broad and general information like elemental analysis (occasionally TEM, SEM, TGA, DSC, etc.). Very complicated structures have been proposed by scientists earlier. Only in very recent years, it has been recognized that these are relatively small molecules which masquerade as supramolecular structures. It is pointed out that most papers do not put down the structure of the compound and provide no concrete proof for proposing such structures. The novelty of our work is that we have characterized the precise molecular weights based on mass spectrometry and NMR spectroscopy along with a well-defined structure. This is not the case in most other publications.

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Construction of Macromolecules of Depolymerized Lignite

Cited by 3 publications

References 35 publications

Catalytic Hydroconversion of Model Compounds over Ni/NiO@NC Nanoparticles

Catalytic Hydroconversion of Model Compounds over Ni/NiO@NC Nanoparticles

Insights into the Relationship between the Microstructure and the Catalytic Behavior of Fe2(MoO4)3 during the Ethanolysis of Naomaohu Coal

Base-Catalyzed Polymerization of a Substituted Methylenebicyclo[3.3.1]nonane

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